Quarterly report pursuant to Section 13 or 15(d)

LONG-TERM DEBT Narrative (Details)

v3.7.0.1
LONG-TERM DEBT Narrative (Details) - USD ($)
3 Months Ended
Dec. 07, 2012
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Dec. 31, 2014
Debt Instrument [Line Items]          
Debt issuance cost   $ 2,316,000   $ 2,395,000  
Write off of Deferred Debt Issuance Cost   500,000      
Payments of Debt Issuance Costs   900,000      
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        
Promissory notes          
Debt Instrument [Line Items]          
Payments on other long-term debt   (400,000) $ (600,000)    
Senior secured revolving credit facility          
Debt Instrument [Line Items]          
Maximum borrowing amount   200,000,000.0      
Increase in commitments due to accordion feature   $ 100,000,000.0      
Commitment fee basis point   0.50%      
Outstanding borrowings   $ 61,000,000      
Letters of credit outstanding   $ 1,300,000      
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 | Loans Payable          
Debt Instrument [Line Items]          
Loan payment     (1,000,000)    
Foreign Tax Authority | Aeroleo          
Debt Instrument [Line Items]          
Taxes, penalties and interest   $ 200,000 $ 2,000,000