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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%.

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