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Debt Items (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Debt And Capital Lease Obligations Outstanding Before Deferred Financing Cost and Purchase Accounting $ 7,427,632 $ 7,595,922
Deferred financing costs 43,684 44,889
Debt Instrument, Unamortized Discount (Premium), Net 4,971 5,293
Adjustment to Purchase Price of Debt 14,252 16,308
Debt and Capital Lease Obligations, net of deferred financing costs 7,364,725 7,529,432
Institutional Notes [Domain]    
Debt Instrument [Line Items]    
Debt and Capital Lease Obligations 2,167,257 2,198,200
Asset-backed securitization term notes    
Debt Instrument [Line Items]    
Debt and Capital Lease Obligations 2,967,601 3,063,821
Secured Debt [Member]    
Debt Instrument [Line Items]    
Debt and Capital Lease Obligations 1,504,375 1,543,375
Asset Backed Warehouse Facility [Member]    
Debt Instrument [Line Items]    
Debt and Capital Lease Obligations 350,000 340,000
Revolving credit facilities    
Debt Instrument [Line Items]    
Debt and Capital Lease Obligations 365,000 375,000
Capital lease obligations    
Debt Instrument [Line Items]    
Debt and Capital Lease Obligations $ 73,399 $ 75,526