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Debt - Schedule of Long-term Debt Outstanding (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Capital lease obligations and sale-leaseback financings $ 167,312 $ 234,356
Total long-term debt 3,010,537 3,468,938
Less: total unamortized deferred financing costs 96,492 107,640
Less: current portion of long-term debt 157,936 154,234
Long-term debt, less current portion 2,756,109 3,207,064
Disposal Group, Held-for-sale, Not Discontinued Operations    
Debt Instrument [Line Items]    
Long-term debt, including current portion 68,931  
Senior Notes    
Debt Instrument [Line Items]    
Total senior and other debt 800,000 800,000
Lines of credit    
Debt Instrument [Line Items]    
Total senior and other debt 76,499 55,799
Notes payable and other debt    
Debt Instrument [Line Items]    
Total senior and other debt 691,390 753,439
Senior and Other Debt    
Debt Instrument [Line Items]    
Total senior and other debt 2,843,225 3,234,582
Senior Long-term Debt    
Debt Instrument [Line Items]    
Total senior and other debt 2,075,336 2,425,344
Secured Credit Facility | Senior Secured Credit Facility    
Debt Instrument [Line Items]    
Total senior and other debt $ 1,275,336 $ 1,625,344