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Borrowings Schedule of Senior Notes (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Senior notes $ 347,063 $ 346,789
Senior Notes [Member]    
Debt Instrument [Line Items]    
Senior notes 350,000 350,000
Unamortized debt issuance costs (2,937) (3,211)
Long-term Debt 347,063 346,789
Senior Notes [Member] | 6.625 Senior Notes, Due 2019 [Member]    
Debt Instrument [Line Items]    
Senior notes 3,122 3,122
Senior Notes [Member] | 8.375% Senior Secured Notes Due In 2022 [Member]    
Debt Instrument [Line Items]    
Senior notes 346,878 346,878
Unamortized debt issuance costs $ (2,900) $ (3,200)