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SERIES B PREFERRED STOCK (Details) (USD $)
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12 Months Ended | 0 Months Ended | |||||
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 20, 2012
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Dec. 18, 2012
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Sep. 25, 2012
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Jun. 08, 2012
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| Class of Stock [Line Items] | |||||||
| Issuance of Series B preferred stock | $ 0us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock | $ 0us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock | $ 100,000,000us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock | ||||
| Series B Convertible Preferred Stock [Member] | |||||||
| Class of Stock [Line Items] | |||||||
| Preferred stock, shares authorized (in shares) |
300,000us-gaap_PreferredStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = era_ConvertibleSeriesBPreferredStockMember |
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| Preferred Stock, Additional Shares Authorized |
700,000era_PreferredStockAdditionalSharesAuthorized / us-gaap_StatementClassOfStockAxis = era_ConvertibleSeriesBPreferredStockMember |
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| Issuance of Series B preferred stock |
100,000,000us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock / us-gaap_StatementClassOfStockAxis = era_ConvertibleSeriesBPreferredStockMember |
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| Preferred stock, par value |
$ 100us-gaap_PreferredStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = era_ConvertibleSeriesBPreferredStockMember |
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| Stock Redeemed or Called During Period, Shares |
500,000us-gaap_StockRedeemedOrCalledDuringPeriodShares / us-gaap_StatementClassOfStockAxis = era_ConvertibleSeriesBPreferredStockMember |
500,000us-gaap_StockRedeemedOrCalledDuringPeriodShares / us-gaap_StatementClassOfStockAxis = era_ConvertibleSeriesBPreferredStockMember |
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| Preferred Stock, Liquidation Preference, Value |
50,000,000us-gaap_PreferredStockLiquidationPreferenceValue / us-gaap_StatementClassOfStockAxis = era_ConvertibleSeriesBPreferredStockMember |
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| Payments for Repurchase of Convertible Preferred Stock |
50,000,000us-gaap_PaymentsForRepurchaseOfConvertiblePreferredStock / us-gaap_StatementClassOfStockAxis = era_ConvertibleSeriesBPreferredStockMember |
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| Line of credit outstanding |
$ 50,000,000us-gaap_LineOfCredit / us-gaap_StatementClassOfStockAxis = era_ConvertibleSeriesBPreferredStockMember |
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| X | ||||||||||
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- Definition
Preferred Stock, Additional Shares Authorized No definition available.
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- Details
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| X | ||||||||||
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- Definition
The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The cash outflow to reacquire preferred stock originally issued and identified as a security that can be exchanged for another type of financial security. This repurchased stock is held in treasury. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Value of the difference between preference in liquidation and the par or stated values of the preferred shares. No definition available.
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- Definition
Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Proceeds from issuance of capital stock which provides for a specific dividend that is paid to the shareholders before any dividends to common stockholders and which takes precedence over common stockholders in the event of liquidation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Number of stock bought back by the entity at the exercise price or redemption price. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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