Quarterly report pursuant to Section 13 or 15(d)

LONG-TERM DEBT Narrative (Details)

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LONG-TERM DEBT Narrative (Details) - USD ($)
 3 Months Ended 6 Months Ended
Dec. 07, 2012
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Mar. 31, 2014
Debt Instrument [Line Items]              
Gain on debt extinguishment   $ 0 $ 0 $ 264,000 $ 0    
Outstanding borrowings   296,412,000   $ 296,412,000   $ 312,426,000  
Senior secured revolving credit facility              
Debt Instrument [Line Items]              
Maximum borrowing amount             $ 300,000,000.0
Increase in commitments due to accordion feature             100,000,000.0
Commitment fee basis point       0.50%      
Remaining borrowing capacity   219,100,000   $ 219,100,000      
Letters of credit outstanding   900,000   900,000      
Debt issuance cost       $ 2,400,000      
Senior secured revolving credit facility | Minimum              
Debt Instrument [Line Items]              
Commitment fee basis point       0.375%      
Senior secured revolving credit facility | Maximum              
Debt Instrument [Line Items]              
Commitment fee basis point       0.50%      
Senior secured revolving credit facility | Base Rate              
Debt Instrument [Line Items]              
Basis spread on variable rate       1.25%      
Senior secured revolving credit facility | Base Rate | Minimum              
Debt Instrument [Line Items]              
Basis spread on variable rate       0.75%      
Senior secured revolving credit facility | Base Rate | Maximum              
Debt Instrument [Line Items]              
Basis spread on variable rate       2.00%      
Senior secured revolving credit facility | London Interbank Offered Rate (LIBOR)              
Debt Instrument [Line Items]              
Basis spread on variable rate       2.25%      
Senior secured revolving credit facility | London Interbank Offered Rate (LIBOR) | Minimum              
Debt Instrument [Line Items]              
Basis spread on variable rate       1.75%      
Senior secured revolving credit facility | London Interbank Offered Rate (LIBOR) | Maximum              
Debt Instrument [Line Items]              
Basis spread on variable rate       3.00%      
Letter of Credit              
Debt Instrument [Line Items]              
Maximum borrowing amount             $ 50,000,000.0
Senior secured revolving credit facility              
Debt Instrument [Line Items]              
Outstanding borrowings   80,000,000   $ 80,000,000   85,000,000  
Secured Debt              
Debt Instrument [Line Items]              
Outstanding borrowings   $ 26,130,000   26,130,000   $ 27,426,000  
Payments on other long-term debt       1,300,000      
Senior Unsecured Notes Due December 15, 2022 | 7.750%Senior Notes              
Debt Instrument [Line Items]              
Aggregate principal amount $ 200,000,000.0            
Stated interest rate 7.75%            
Proceeds from issuance of long-term debt $ 191,900,000            
Repurchase amount       9,900,000      
Gain on debt extinguishment       $ 300,000