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Debt Obligations, net (Secured Credit Facility and Term Loan Narrative) (Details) shares in Millions | 1 Months Ended | 2 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Mar. 31, 2015 USD ($) | Mar. 31, 2012 USD ($) tranche | Feb. 24, 2017 | Dec. 31, 2016 USD ($) shares | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Aug. 31, 2016 USD ($)
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Repayment of principal amount |  |  |  |  |  |  | $ 1,437,557,000 | $ 432,383,000 | $ 1,471,174,000 |
Loss on early extinguishment of debt, net |  |  |  |  |  |  | 1,619,000 | 281,000 | 25,369,000 |
Borrowings from debt obligations |  |  |  |  |  |  | 716,001,000 | 549,000,000 | 1,349,822,000 |
Conversion of senior unsecured convertible notes into common stock |  |  |  |  |  |  | $ 9,596,000 | 0 | 0 |
2016 Senior Secured Credit Facility |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 450,000,000.0 |  |  |  |  |  |  |  | $ 500,000,000.0
Percentage of par credit facilities were issued at |  | 99.00% |  |  |  |  |  |  |  |
Variable interest rate, spread |  |  |  |  |  |  | 1.00% |  |  |
Multiple of the minimum collateral coverage on outstanding borrowings |  | 1.25 |  |  |  |  |  |  |  |
Minimum amortization payment |  |  |  |  |  |  | 0.25% |  |  |
Lender fees |  | $ 4,500,000 |  |  |  |  |  |  |  |
Third party fees recognized |  | 6,200,000 |  |  |  |  |  |  |  |
Third party fees capitalized |  | 4,300,000 |  |  |  |  |  |  |  |
2016 Senior Secured Credit Facility | Other Expense |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Third party fees 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% |  |  |  |  | 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% |  |  |  |  | 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 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% |  |  |
Repayment of principal amount |  |  |  |  |  |  | $ 323,200,000 |  |  |
Loss on early extinguishment of debt, net |  |  |  |  |  |  | $ 1,200,000 | $ 300,000 | $ 1,500,000 |
2012 Tranche A-2 Facility | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Variable interest rate, spread |  |  |  |  |  |  | 5.75% |  |  |
2015 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 | 1.5 |  |  |  |  |  | 1.5 |  |  |
Repayment of principal amount |  |  | $ 5,000,000 |  |  |  | $ 245,000,000 |  |  |
Maximum borrowing capacity | $ 250,000,000.0 |  |  | $ 250,000,000.0 |  |  | $ 250,000,000.0 |  |  |
Line of credit facility, interest rate |  |  |  |  |  |  | 3.19% |  |  |
Converted loan, term |  |  |  |  |  |  | 1 year |  |  |
2015 Revolving Credit Facility | Minimum |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Commitment fee percentage |  |  |  | 0.375% |  |  |  |  |  |
2015 Revolving Credit Facility | Maximum |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Commitment fee percentage |  |  |  | 0.50% |  |  |  |  |  |
2015 Revolving Credit Facility | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Variable interest rate, spread |  |  |  |  |  |  | 2.75% |  |  |
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 | 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% |  |  |  |  |
5.875% senior notes |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Repayment of principal amount |  |  | $ 261,400,000 |  |  |  |  |  |  |
Stated interest rate (as a percent) | 5.875% |  | 5.875% |  |  |  | 5.875% |  |  |
6.50% senior notes |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) | 6.50% |  | 6.50% |  |  |  | 6.50% |  |  |
Borrowings from debt obligations |  |  | $ 275,000,000 |  |  |  |  |  |  |
Unsecured Notes 3.875 Percent Senior Notes Due July 2016 |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Repayment of principal amount |  |  | $ 265,000,000 |  |  |  |  |  |  |
Stated interest rate (as a percent) | 3.875% |  |  |  |  |  | 3.875% |  |  |
3.00% senior convertible notes |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Repayment of principal amount |  |  |  |  |  |  | $ 200,000,000 |  |  |
Stated interest rate (as a percent) |  |  |  |  |  |  |  | 3.00% |  |
Conversion of senior unsecured convertible notes into common stock |  |  |  |  |  |  | $ 9,600,000 | $ 9,600,000 |  |
Shares of common stock converted (in shares) | shares |  |  |  |  |  |  | 0.8 |  |  |
1.50% senior convertible notes |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Repayment of principal amount |  |  |  |  |  |  | $ 200,000,000 |  |  |
Stated interest rate (as a percent) |  |  |  |  |  |  |  | 1.50% |  |
Unsecured Debt |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Loss on early extinguishment of debt, net |  |  |  |  |  |  | 400,000 |  |  |
2016 Secured Term Loan | Secured Debt |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | $ 170,000,000 |  |  |  |  |  | $ 170,000,000 |  |  |
2016 Secured Term Loan | Secured Debt | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Variable interest rate, spread | 1.50% |  |  |  |  |  |  |  |  |
Subsequent Event | 2016 Senior Secured Credit Facility | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Variable interest rate, spread |  |  |  |  |  | 3.75% |  |  |  |
Subsequent Event | 2016 Senior Secured Credit Facility | London Interbank Offered Rate (LIBOR) | Minimum |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Variable interest rate, spread |  |  |  |  |  | 1.00% |  |  |  |

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