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LONG-TERM DEBT - Interest Rate and Fees (Narrative) (Details)
12 Months Ended
Dec. 31, 2017
Receivables Based Credit Facility  
Debt Instrument [Line Items]  
Commitment fee rate 0.75%
Receivables Based Credit Facility | Federal funds effective rate  
Debt Instrument [Line Items]  
Basis spread on variable rate 0.50%
Receivables Based Credit Facility | Eurocurrency rate  
Debt Instrument [Line Items]  
Basis spread on variable rate 1.00%
Revolving credit facility | Receivables Based Credit Facility | Eurocurrency rate  
Debt Instrument [Line Items]  
Stated interest rate 4.75%
Revolving credit facility | Receivables Based Credit Facility | Base rate  
Debt Instrument [Line Items]  
Stated interest rate 3.75%
Term Loan D | Senior Secured Credit Facility | Eurocurrency rate  
Debt Instrument [Line Items]  
Basis spread on variable rate 6.75%
Term Loan D | Senior Secured Credit Facility | Base rate  
Debt Instrument [Line Items]  
Basis spread on variable rate 5.75%
Term Loan E | Senior Secured Credit Facility | Eurocurrency rate  
Debt Instrument [Line Items]  
Basis spread on variable rate 7.50%
Term Loan E | Senior Secured Credit Facility | Base rate  
Debt Instrument [Line Items]  
Basis spread on variable rate 6.50%