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Borrowings Schedule of Senior Notes (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 05, 2016
Dec. 31, 2015
Debt Instrument [Line Items]      
Long-term debt, gross $ 4,012,812   $ 3,089,255
Unamortized debt issuance costs     (24,500)
8.375% Senior Secured Notes Due In 2022 [Member]      
Debt Instrument [Line Items]      
Senior notes   $ 346,900  
Senior Notes [Member]      
Debt Instrument [Line Items]      
Long-term debt, gross 350,000   350,000
Unamortized debt issuance costs (3,211)   (4,489)
Senior notes 346,789   345,511
Senior Notes [Member] | 6.625 Senior Notes, Due 2019 [Member]      
Debt Instrument [Line Items]      
Long-term debt, gross 3,122   350,000
Senior Notes [Member] | 8.375% Senior Secured Notes Due In 2022 [Member]      
Debt Instrument [Line Items]      
Long-term debt, gross 346,878   $ 0
Unamortized debt issuance costs $ (3,200)