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EARNINGS (LOSS) PER COMMON SHARE (Details) (USD $)
In Thousands, except Share data, unless otherwise specified |
3 Months Ended | |||||||
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Mar. 31, 2015
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Mar. 31, 2014
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| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||||||||
| Net income attributable to common shares | $ (42)era_NetIncomeLossAvailabletoVestedCommonStockholdersBasic | [1] | $ 4,389era_NetIncomeLossAvailabletoVestedCommonStockholdersBasic | [1] | ||||
| Weighted average number of common shares outstanding—basic (in shares) | 20,195,955us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 19,952,930us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | ||||||
| Weighted average number of common shares outstanding—diluted (in shares) | 20,195,955us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 20,025,135us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | ||||||
| Basic Earnings per Common Share (in dollars per share) | $ 0.00us-gaap_EarningsPerShareBasic | $ 0.22us-gaap_EarningsPerShareBasic | ||||||
| Diluted Earnings per Common Share (in dollars per share) | $ 0.00us-gaap_EarningsPerShareDiluted | $ 0.22us-gaap_EarningsPerShareDiluted | ||||||
| Restricted Stock [Member] | ||||||||
| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||||||||
| Net income attributable to common shares |
$ 0era_NetIncomeLossAvailabletoUnvestedCommonStockholdersBasic / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_RestrictedStockMember |
$ 56era_NetIncomeLossAvailabletoUnvestedCommonStockholdersBasic / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_RestrictedStockMember |
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| Stock Options and Restricted Stock [Member] | ||||||||
| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||||||||
| Net effect of dilutive stock options and restricted stock awards based on the treasury stock method (in shares) |
0us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = era_StockOptionsAndRestrictedStockMember |
[2] |
72,205us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = era_StockOptionsAndRestrictedStockMember |
[2] | ||||
| Unvested restricted common shares |
114,955us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = era_StockOptionsAndRestrictedStockMember |
6,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = era_StockOptionsAndRestrictedStockMember |
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- Definition
Net Income (Loss) Available to Unvested Common Stockholders, Basic No definition available.
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- Definition
Net Income (Loss) Available to Vested Common Stockholders, Basic No definition available.
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- Definition
Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Definition
The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Details
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