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Borrowings Schedule of Senior Notes (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Total Financing liabilities $ 4,295,408 $ 4,012,812
Senior Notes [Member]    
Debt Instrument [Line Items]    
Total Financing liabilities 350,000 350,000
Unamortized debt issuance costs (3,071) (3,211)
Long-term Debt 346,929 346,789
Senior Notes [Member] | 6.625 Senior Notes, Due 2019 [Member]    
Debt Instrument [Line Items]    
Total Financing liabilities 3,122 3,122
Senior Notes [Member] | 8.375% Senior Secured Notes Due In 2022 [Member]    
Debt Instrument [Line Items]    
Total Financing liabilities 346,878 346,878
Unamortized debt issuance costs $ (3,000) $ (3,200)