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
Jun. 30, 2015
Dec. 31, 2014
Principal components:    
Senior secured revolving credit facility $ 75,000 $ 35,000
Principal components:    
Total carrying value of borrowings 375,000 335,000
Senior Secured Revolving Credit Facility [Member]    
Principal components:    
Senior secured revolving credit facility 75,000 35,000
Secured second lien term loan [Member]    
Principal components:    
Term loan $ 300,000 $ 300,000