Quarterly report pursuant to Section 13 or 15(d)

LONG-TERM DEBT - Narrative (Details)

v3.8.0.1
LONG-TERM DEBT - Narrative (Details) - USD ($)
9 Months Ended
Dec. 07, 2012
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Oct. 27, 2016
Dec. 31, 2014
Debt Instrument [Line Items]            
Debt issuance cost   $ 2,152,000   $ 2,395,000    
Write off of deferred debt issuance cost   500,000        
Payments of debt issuance costs   900,000        
7.750% Senior Notes (excluding unamortized discount) | 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   1,200,000 $ 1,400,000      
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   $ 51,000,000        
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 $ 2,500,000