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Senior Notes - Senior Secured Credit Facility (Details) - USD ($)
$ in Thousands
6 Months Ended
Dec. 31, 2014
Jun. 30, 2016
Dec. 31, 2015
Apr. 07, 2014
Debt        
Borrowings outstanding   $ 315,000 $ 326,793  
Senior Secured Credit Facility        
Debt        
Maximum borrowing capacity   105,000   $ 105,000
Conditional maximum borrowing capacity       175,000
Borrowings outstanding   $ 35,000 $ 0  
Senior Secured Credit Facility | JPMorgan Chase Bank, N.A.        
Debt        
Maximum borrowing capacity       65,000
Senior Secured Credit Facility | Citibank and Deutsche Bank        
Debt        
Increase in maximum borrowing capacity $ 40,000      
Swing-line facility        
Debt        
Maximum borrowing capacity       $ 30,000