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Long-Term Debt - Narrative (Details) - USD ($)
Sep. 29, 2017
Dec. 23, 2016
Dec. 31, 2017
Oct. 27, 2017
Dec. 31, 2016
Debt Instrument [Line Items]          
Accounts receivable     $ 148,444,000   $ 108,655,000
Long-term debt     259,242,000   184,752,000
Capital Leases and Other Notes Payable          
Debt Instrument [Line Items]          
Debt covenant, minimum unrestricted cash and cash equivalents balances     $ 25,000,000    
Credit Facility          
Debt Instrument [Line Items]          
Maximum borrowing capacity $ 100,000,000     $ 120,000,000  
Option for additional borrowing capacity on line of credit $ 50,000,000        
Closing payment fee rate 0.375%        
Effective interest rate     4.63%    
Letters of credit outstanding     $ 45,200,000    
Aggregate principal amount     64,000,000   0
Available borrowing capacity     11,500,000    
Credit Facility | Base Rate          
Debt Instrument [Line Items]          
Basis spread on variable rate 2.25%        
Credit Facility | London Interbank Offered Rate (LIBOR)          
Debt Instrument [Line Items]          
Basis spread on variable rate 3.25%        
Revolving Credit Facility | Second A&R Credit Agreement          
Debt Instrument [Line Items]          
Maximum borrowing capacity   $ 75,000,000      
Revolving Credit Facility | Second A&R Credit Agreement | Federal Funds Rate          
Debt Instrument [Line Items]          
Basis spread on variable rate   0.50%      
Revolving Credit Facility | Second A&R Credit Agreement | Eurodollar          
Debt Instrument [Line Items]          
Basis spread on variable rate   1.00%      
Revolving Credit Facility | Second A&R Credit Agreement | Minimum | Base Rate          
Debt Instrument [Line Items]          
Basis spread on variable rate   1.50%      
Revolving Credit Facility | Second A&R Credit Agreement | Minimum | London Interbank Offered Rate (LIBOR)          
Debt Instrument [Line Items]          
Basis spread on variable rate   2.50%      
Revolving Credit Facility | Second A&R Credit Agreement | Maximum | Base Rate          
Debt Instrument [Line Items]          
Basis spread on variable rate   3.50%      
Revolving Credit Facility | Second A&R Credit Agreement | Maximum | London Interbank Offered Rate (LIBOR)          
Debt Instrument [Line Items]          
Basis spread on variable rate   4.50%      
Letter of Credit | Second A&R Credit Agreement          
Debt Instrument [Line Items]          
Maximum borrowing capacity   $ 65,000,000      
Swing Line Loan | Second A&R Credit Agreement          
Debt Instrument [Line Items]          
Maximum borrowing capacity   $ 10,000,000      
Term Loan          
Debt Instrument [Line Items]          
Aggregate principal amount     162,525,000   $ 164,175,000
Term Loan | Amended and Restated Term Loan Agreement          
Debt Instrument [Line Items]          
Closing payment fee rate   7.00%      
Outstanding borrowings   $ 164,200,000      
Stated interest rate   13.50%      
Variable Interest Entity          
Debt Instrument [Line Items]          
Accounts receivable     148,400,000    
Long-term debt     $ 64,000,000