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Debt and Other Financing Arrangements - Accounts Receivable Securitization Facility (Details) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]      
Receivables facility maximum borrowing capacity   $ 120,000,000  
Receivables facility maximum borrowing availability   107,300,000  
Long-term Line of Credit   0  
Letters of Credit Outstanding, Amount   6,300,000  
Receivables Facility Remaining Borrowing Capacity   $ 101,000,000  
Accounts Receivable Facility, Renewal Term 364    
London Interbank Offered Rate (LIBOR) [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Basis Spread on Variable Rate   1.00% 1.00%
Receivables Facilities [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate During Period   1.80%  
Receivables Facilities [Member] | London Interbank Offered Rate (LIBOR) [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Basis Spread on Variable Rate   1.10%