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Long-Term Debt (Accounts Receivable Securitization) (Details) - Securitization facility - USD ($)
Dec. 10, 2015
Sep. 11, 2014
Dec. 19, 2012
Dec. 31, 2016
Dec. 31, 2015
Line of Credit Facility [Line Items]          
Maturity period of debt     3 years    
Securitization agreement, maximum borrowing capacity   $ 500,000,000 $ 300,000,000    
Payment of financing costs $ 250,000        
Basis spread on securitization agreement   0.70%      
Commitment fee percentage on unused amount of each lender's commitment   0.30%      
Carrying Value          
Line of Credit Facility [Line Items]          
Securitization facility       $ 500,000,000 $ 500,000,000