Quarterly report pursuant to Section 13 or 15(d)

Borrowings (Schedule of Borrowings) (Details)

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Borrowings (Schedule of Borrowings) (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Principal components:    
Total principal outstanding $ 400,000 $ 400,000
Total carrying value of borrowings 390,536 390,219
6.125% senior unsecured notes due 2024 [Member]    
Principal components:    
Total principal outstanding 400,000 400,000
Unamortized deferred financing costs $ (9,464) $ (9,781)