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Debt Obligations, net (Unsecured Notes Narrative) (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Oct. 31, 2017
Debt Instrument [Line Items] |  |  |  |  |  |
Loss on early extinguishment of debt |  | $ 911,000 | $ 616,000 | $ 3,447,000 | $ 4,142,000 |
Unsecured Notes 4.0% Senior Notes Due November 2017 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated interest rates (as a percent) | 4.00% |  | 4.00% |  | 4.00% |
Extinguishment of debt, amount | $ 550,000,000.0 |  |  |  |  |
Unsecured Notes 7.125% Senior Notes Due February 2018 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated interest rates (as a percent) | 7.125% |  | 7.125% |  | 7.125% |
Extinguishment of debt, amount | $ 300,000,000.0 |  |  |  |  |
Unsecured Notes 4.875% Senior Notes Due July 2018 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated interest rates (as a percent) | 4.875% |  | 4.875% |  | 4.875% |
Extinguishment of debt, amount | $ 300,000,000.0 |  |  |  |  |
Unsecured Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Loss on early extinguishment of debt |  | $ 900,000 | $ 3,100,000 | $ 900,000 | $ 3,100,000 |
Unsecured 4.625% Senior Notes Due September 2020 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, face amount | $ 400,000,000.0 |  | $ 400,000,000.0 |  | $ 400,000,000.0 |
Stated interest rates (as a percent) | 4.625% | 4.625% | 4.625% | 4.625% | 4.625% |
Unsecured 5.25% Senior Notes Due September 2022 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, face amount | $ 400,000,000.0 |  | $ 400,000,000.0 |  | $ 400,000,000.0 |
Stated interest rates (as a percent) | 5.25% | 5.25% | 5.25% | 5.25% | 5.25% |
Unsecured 3.125% Senior Convertible Notes Due September 2022 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, face amount | $ 250,000,000.0 |  | $ 250,000,000.0 |  | $ 250,000,000.0 | $ 37,500,000.0
Stated interest rates (as a percent) | 3.125% | 3.125% | 3.125% | 3.125% | 3.125% | 3.125%
Unsecured Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Deferred financing costs | $ 18,600,000 |  | $ 18,600,000 |  | $ 18,600,000 |

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