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