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Long-Term Borrowings and Capital Lease Obligations (Details) - USD ($)
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Long-Term Borrowings and Capital Lease Obligations    
Outstanding debt and capital lease obligations repaid $ 104,654,000 $ 304,654,000
2016 Credit Agreement | Term Loan    
Long-Term Borrowings and Capital Lease Obligations    
Maximum borrowing capacity $ 700,000,000  
Term of facility 5 years  
Repayments on outstanding debt $ 30,000,000  
Amount outstanding, net of discount and debt issuance costs 668,000,000  
2016 Credit Agreement | Refinancing Term Loan    
Long-Term Borrowings and Capital Lease Obligations    
Maximum borrowing capacity 300,000,000  
2016 Credit Agreement | Delayed Draw Term Loan    
Long-Term Borrowings and Capital Lease Obligations    
Maximum borrowing capacity 400,000,000  
2016 Credit Agreement | Revolving Loan Facility    
Long-Term Borrowings and Capital Lease Obligations    
Maximum borrowing capacity 800,000,000  
Repayments on outstanding debt 70,000,000  
Amount outstanding $ 0