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Debt (Details 2) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Unamortized debt issuance costs $ (3,000) $ (3,100)
Total 159,198 159,176
Senior Notes [Member]    
Total Principal 160,000 160,000
Unamortized debt issuance costs (802) (824)
Total 159,198 159,176
Senior Notes [Member] | Senior Unsecured Note 2025 [Member]    
Debt Instrument, Face Amount 50,000 50,000
Senior Notes [Member] | Senior Unsecured Note 2027 [Member]    
Debt Instrument, Face Amount 50,000 50,000
Senior Notes [Member] | Senior Unsecured Note 2028 [Member]    
Debt Instrument, Face Amount $ 60,000 $ 60,000