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Debt Obligations, net (Unsecured Notes Narrative) (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Mar. 31, 2016 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Debt Instrument [Line Items] |  |  |  |  |
Repayments of debt |  |  |  | $ 1,065,253 | $ 430,048
Borrowings from debt obligations |  |  |  | 696,401 | 549,000
Loss on early extinguishment of debt, net |  | $ 36 | $ 67 | $ 1,618 | $ 279
5.875% senior notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Repayments of debt | $ 261,400 |  |  |  |
Stated interest rates | 5.875% | 5.875% |  | 5.875% |
6.50% senior notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rates | 6.50% | 6.50% |  | 6.50% |
Borrowings from debt obligations | $ 275,000 |  |  |  |
3.875% senior notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Repayments of debt | 265,000 |  |  |  |
Stated interest rates |  | 3.875% |  | 3.875% |
2015 $250 Million Secured Revolving Credit Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Repayments of debt | $ 5,000 |  |  | $ 245,000 |
1.50% senior convertible notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Repayments of debt |  | $ 21,800 |  |  |
Stated interest rates |  | 1.50% |  | 1.50% |
Unsecured Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Loss on early extinguishment of debt, net |  | $ 100 |  | $ 400 |

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