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Debt Obligations, net (Secured Credit Facility Narrative) (Details)
 1 Months Ended 3 Months Ended 9 Months Ended
Mar. 31, 2016
USD ($)
Mar. 31, 2015
USD ($)
Mar. 31, 2012
USD ($)
tranche
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Aug. 31, 2016
USD ($)
Jun. 30, 2016
USD ($)
Line of Credit Facility [Line Items]                  
Repayments of debt           $ 1,065,253,000 $ 430,048,000    
Loss on early extinguishment of debt, net       $ 36,000 $ 67,000 $ 1,618,000 279,000    
2016 Senior Secured Credit Facility                  
Line of Credit Facility [Line Items]                  
Debt instrument, face amount               $ 500,000,000.0 $ 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           6,200,000      
Debt instrument, third party fees, amount capitalized           4,300,000      
2016 Senior Secured Credit Facility | Other Expense                  
Line of Credit Facility [Line Items]                  
Debt instrument, thirst party fees, amount recognized           $ 1,900,000      
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 | London Interbank Offered Rate (LIBOR) | Minimum                  
Line of Credit Facility [Line Items]                  
Variable interest rate, spread           1.00%      
2016 Senior Secured Credit Facility | London Interbank Offered Rate (LIBOR) | Maximum                  
Line of Credit Facility [Line Items]                  
Variable interest rate, spread           3.50%      
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         $ 100,000 $ 1,200,000 $ 300,000    
2012 Secured Tranche A-2 Facility | London Interbank Offered Rate (LIBOR)                  
Line of Credit Facility [Line Items]                  
Variable interest rate, spread           5.75%      
2012 Secured Tranche A-2 Facility | London Interbank Offered Rate (LIBOR) | Minimum                  
Line of Credit Facility [Line Items]                  
Variable interest rate, spread     1.25%            
2015 $250 Million Secured Revolving Credit Facility                  
Line of Credit Facility [Line Items]                  
Debt instrument, face amount       $ 250,000,000   $ 250,000,000      
Multiple of the minimum collateral coverage on outstanding borrowings (at least)       1.5   1.5      
Repayments of debt $ 5,000,000         $ 245,000,000      
Line of credit facility, maximum borrowing capacity   $ 250,000,000.0   $ 250,000,000.0   $ 250,000,000.0      
Interest rate during period       3.22%          
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 | Maximum                  
Line of Credit Facility [Line Items]                  
Commitment fee percentage   0.50%              
2015 $250 Million Secured Revolving Credit Facility | London Interbank Offered Rate (LIBOR)                  
Line of Credit Facility [Line Items]                  
Variable interest rate, spread           2.75%      
2015 $250 Million Secured Revolving Credit Facility | London Interbank Offered Rate (LIBOR) | Minimum                  
Line of Credit Facility [Line Items]                  
Variable interest rate, spread           1.00%      
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 | London Interbank Offered Rate (LIBOR) | Minimum                  
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       $ 100,000   $ 400,000