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Debt Obligations, net (Secured Credit Facility Narrative) (Details)
 1 Months Ended 3 Months Ended 9 Months Ended 39 Months Ended
Mar. 31, 2012
USD ($)
tranche
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
Mar. 27, 2015
USD ($)
Line of Credit Facility [Line Items]              
Repayments of Debt       $ 430,048,000 $ 1,445,635,000    
Loss on early extinguishment of debt, net   $ 67,000 $ 186,000 $ 279,000 24,953,000    
2012 Secured Credit Facilities              
Line of Credit Facility [Line Items]              
Debt instrument, face amount $ 880,000,000            
Number of tranches | tranche 2            
2012 Tranche A-1 Facility              
Line of Credit Facility [Line Items]              
Debt instrument, face amount $ 410,000,000            
Variable interest rate, basis       LIBOR      
Percentage of par credit facilities were issued at 98.00%            
Variable interest rate, spread       4.00%      
2012 Tranche A-2 Facility              
Line of Credit Facility [Line Items]              
Debt instrument, face amount $ 470,000,000            
Repayments of Debt           $ 130,100,000  
Stated Interest Rates   7.00%   7.00%      
Loss on early extinguishment of debt, net   $ 100,000 $ 200,000 $ 300,000 $ 1,000,000    
Variable interest rate, basis [1]       LIBOR      
Percentage of par credit facilities were issued at 98.50%            
Variable interest rate, spread   5.75% [1]   5.75%      
2015 Revolving Credit Facility              
Line of Credit Facility [Line Items]              
Line of credit facility, maximum borrowing capacity             $ 250,000,000.0
Line of Credit Facility, Interest Rate at Period End   3.17%          
Converted term loan, term       1 year      
Minimum              
Line of Credit Facility [Line Items]              
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage       0.375%      
Minimum | 2012 Tranche A-2 Facility              
Line of Credit Facility [Line Items]              
Variable interest rate, spread   1.25%          
Maximum              
Line of Credit Facility [Line Items]              
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage       0.50%      
London Interbank Offered Rate (LIBOR) | Minimum | 2012 Tranche A-1 Facility              
Line of Credit Facility [Line Items]              
Variable interest rate, spread       1.25%      
[1] The loan has a LIBOR floor of 1.25%. As of September 30, 2015, inclusive of the floor, the 2012 Tranche A-2 Facility loan incurred interest at a rate of 7.00%.