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Debt Obligations (Details 2) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Accrued interest $ 22,500 $ 31,100
Long-term debt 5,996,476  
Unsecured Credit Facility and 3.850% Senior Notes due 2025 [Member]    
Debt Instrument [Line Items]    
Debt subject to maintenance of various financial covenants 2,750,000  
Term Loan [Member]    
Debt Instrument [Line Items]    
Long-term debt $ 600,000