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Debt Obligations, net (Unsecured Notes Narrative) (Details) - USD ($) shares in Millions |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 12, 2017 | Mar. 31, 2017 | Nov. 30, 2016 | Mar. 31, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Nov. 02, 2017
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  |  |  | $ 726,795,000 | $ 1,065,253,000 |
Loss on early extinguishment of debt, net |  |  |  |  | $ 616,000 | $ 36,000 | 4,142,000 | 1,618,000 |
4.625% senior notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  | $ 400,000,000.0 |  | $ 400,000,000.0 |  |
Stated interest rates (as a percent) |  |  |  |  | 4.625% |  | 4.625% |  |
5.25% senior notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  | $ 400,000,000.0 |  | $ 400,000,000.0 |  |
Stated interest rates (as a percent) |  |  |  |  | 5.25% |  | 5.25% |  |
3.125% senior convertible notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  | $ 250,000,000.0 |  | $ 250,000,000.0 |  |
Stated interest rates (as a percent) |  |  |  |  | 3.125% |  | 3.125% |  |
Unsecured Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Deferred financing costs |  |  |  |  | $ 17,400,000 |  | $ 17,400,000 |  |
Loss on early extinguishment of debt, net |  |  |  |  |  | $ 100,000 | $ 3,100,000 | $ 400,000 |
6.00% senior notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 375,000,000.0 |  |  |  |  |  |  |
Stated interest rates (as a percent) |  | 6.00% |  |  | 6.00% |  | 6.00% |  |
5.85% senior notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated interest rates (as a percent) |  | 5.85% |  |  | 5.85% |  | 5.85% |  |
Repayments of debt |  | $ 99,700,000 |  |  |  |  |  |  |
9.00% senior notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated interest rates (as a percent) | 9.00% |  |  |  | 9.00% |  | 9.00% |  |
Repayments of debt | $ 275,000,000 |  |  |  |  |  |  |  |
5.875% senior notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated interest rates (as a percent) |  |  |  | 5.875% |  |  |  |  |
Repayments of debt |  |  |  | $ 261,400,000 |  |  |  |  |
6.50% senior notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  | $ 275,000,000 |  |  |  |  |
Stated interest rates (as a percent) |  |  |  | 6.50% | 6.50% |  | 6.50% |  |
3.875% senior notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  | $ 265,000,000 |  |  |  |  |
2015 $325 Million Secured Revolving Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  | $ 5,000,000 |  |  |  |  |
3.00% senior convertible notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated interest rates (as a percent) |  |  | 3.00% |  |  |  |  |  |
Repayments of debt |  |  | $ 200,000,000 |  |  |  |  |  |
Conversion of senior unsecured convertible notes into common stock |  |  | $ 9,600,000 |  |  |  |  |  |
Shares of common stock converted (in shares) |  |  | 0.8 |  |  |  |  |  |
Subsequent Event | 3.125% senior convertible notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  | $ 37,500,000

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- Definition The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 + Details
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