Quarterly report pursuant to Section 13 or 15(d)

LONG-TERM DEBT Narrative (Details)

v3.5.0.2
LONG-TERM DEBT Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Dec. 07, 2012
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Debt Instrument [Line Items]                
Gain (loss) on debt extinguishment   $ 0 $ (16,000) $ 518,000 $ 248,000      
Debt issuance cost   2,473,000   2,473,000   $ 2,740,000    
Contribution of capital from joint venture partner       6,349,000        
Senior Notes | Senior Unsecured Notes Due December 15, 2022                
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       5,000,000 24,900,000      
Gain (loss) on debt extinguishment       500,000 $ 200,000      
Promissory notes                
Debt Instrument [Line Items]                
Payments on other long-term debt       $ (1,400,000)        
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%        
Outstanding borrowings   70,000,000   $ 70,000,000        
Letters of credit outstanding   $ 1,200,000   $ 1,200,000        
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
Aeroleo                
Debt Instrument [Line Items]                
Contribution of capital from joint venture partner       $ 6,300,000        
Aeroleo | Loans Payable                
Debt Instrument [Line Items]                
Loan payment       $ (1,000,000)