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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 |  |  |

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