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Debt Obligations, net (Secured Credit Facility Narrative) (Details)
 1 Months Ended 3 Months Ended 6 Months Ended
Mar. 31, 2016
USD ($)
Mar. 31, 2015
Mar. 31, 2012
USD ($)
tranche
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Line of Credit Facility [Line Items]              
Repayments of debt           $ 991,184,000 $ 247,055,000
Loss on early extinguishment of debt, net       $ 1,457,000 $ 44,000 1,582,000 212,000
2016 Senior Secured Credit Facility              
Line of Credit Facility [Line Items]              
Debt instrument, face amount       $ 450,000,000.0   $ 450,000,000.0  
Percentage of par credit facilities were issued at       99.00%   99.00%  
Variable interest rate, spread           1.00%  
Multiple of the minimum collateral coverage on outstanding borrowings (at least)       1.25   1.25  
Minimum amortization payment           0.25%  
Deferred finance costs, gross           $ 4,500,000  
Debt instrument, thirst party fees, amount recognized           5,700,000  
Debt instrument, third party fees, amount capitalized           $ 3,900,000  
2016 Senior Secured Credit Facility | London Interbank Offered Rate (LIBOR)              
Line of Credit Facility [Line Items]              
Variable interest rate, spread           4.50%  
2016 Senior Secured Credit Facility | Minimum | London Interbank Offered Rate (LIBOR)              
Line of Credit Facility [Line Items]              
Variable interest rate, spread           1.00%  
2015 $250 Million Secured Revolving Credit Facility              
Line of Credit Facility [Line Items]              
Multiple of the minimum collateral coverage on outstanding borrowings (at least)       1.5   1.5  
Repayments of debt $ 5,000,000            
Line of credit facility, maximum borrowing capacity       $ 250,000,000.0   $ 250,000,000.0  
Line of Credit Facility, interest rate during period       3.21%      
Converted term loan, term           1 year  
2015 $250 Million Secured Revolving Credit Facility | Minimum              
Line of Credit Facility [Line Items]              
Commitment fee percentage   0.375%          
2015 $250 Million Secured Revolving Credit Facility | Minimum | London Interbank Offered Rate (LIBOR)              
Line of Credit Facility [Line Items]              
Variable interest rate, spread           1.00%  
2015 $250 Million Secured Revolving Credit Facility | Maximum              
Line of Credit Facility [Line Items]              
Commitment fee percentage   0.50%          
2012 Secured Credit Facilities              
Line of Credit Facility [Line Items]              
Debt instrument, face amount     $ 880,000,000        
Multiple of the minimum collateral coverage on outstanding borrowings (at least)       1.25   1.25  
Number of tranches | tranche     2        
2012 Tranche A-1 Facility              
Line of Credit Facility [Line Items]              
Debt instrument, face amount     $ 410,000,000        
Percentage of par credit facilities were issued at     98.00%        
Variable interest rate, spread     4.00%        
2012 Tranche A-1 Facility | Minimum              
Line of Credit Facility [Line Items]              
Variable interest rate, spread           1.25%  
2012 Secured Tranche A-2 Facility              
Line of Credit Facility [Line Items]              
Debt instrument, face amount     $ 470,000,000        
Percentage of par credit facilities were issued at     98.50%        
Variable interest rate, spread     5.75%        
Repayments of debt           $ 323,200,000  
Loss on early extinguishment of debt, net       $ 1,100,000 $ 100,000 $ 1,200,000 $ 200,000
2012 Secured Tranche A-2 Facility | Minimum | London Interbank Offered Rate (LIBOR)              
Line of Credit Facility [Line Items]              
Variable interest rate, spread           1.25%  
Unsecured Debt              
Line of Credit Facility [Line Items]              
Loss on early extinguishment of debt, net           $ 400,000  
Other Expense | 2016 Senior Secured Credit Facility              
Line of Credit Facility [Line Items]              
Debt instrument, thirst party fees, amount recognized           $ 1,800,000