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Debt Obligations, net (Future Scheduled Maturities) (Details) - USD ($) $ in Thousands | 1 Months Ended |  |
--- | --- | --- | ---
Nov. 02, 2017 | Sep. 30, 2017 | Dec. 31, 2016
Maturities of Long-term Debt [Abstract] |  |  |
2017 (remaining three months) |  | $ 550,000 |
2018 |  | 609,523 |
2019 |  | 797,924 |
2020 |  | 400,000 |
2021 |  | 792,506 |
Thereafter |  | 1,193,229 |
Total principal maturities |  | 4,343,182 | $ 3,418,357
Unamortized discounts and deferred financing costs, net |  | (64,228) | (28,449)
Total debt obligations, net |  | 4,278,954 | $ 3,389,908
Unsecured Debt |  |  |
Maturities of Long-term Debt [Abstract] |  |  |
2017 (remaining three months) |  | 550,000 |
2018 |  | 600,000 |
2019 |  | 770,000 |
2020 |  | 400,000 |
2021 |  | 275,000 |
Thereafter |  | 1,125,000 |
Total principal maturities |  | 3,720,000 |
Unamortized discounts and deferred financing costs, net |  | (56,331) |
Total debt obligations, net |  | 3,663,669 |
Secured Debt |  |  |
Maturities of Long-term Debt [Abstract] |  |  |
2017 (remaining three months) |  | 0 |
2018 |  | 9,523 |
2019 |  | 27,924 |
2020 |  | 0 |
2021 |  | 517,506 |
Thereafter |  | 68,229 |
Total principal maturities |  | 623,182 |
Unamortized discounts and deferred financing costs, net |  | (7,897) |
Total debt obligations, net |  | $ 615,285 |
4.00% senior notes |  |  |
Maturities of Long-term Debt [Abstract] |  |  |
Stated interest rates (as a percent) |  | 4.00% |
7.125% senior notes |  |  |
Maturities of Long-term Debt [Abstract] |  |  |
Stated interest rates (as a percent) |  | 7.125% |
4.875% senior notes |  |  |
Maturities of Long-term Debt [Abstract] |  |  |
Stated interest rates (as a percent) |  | 4.875% |
Subsequent Event | 4.00% senior notes |  |  |
Maturities of Long-term Debt [Abstract] |  |  |
Extinguishment of debt, amount | $ 550,000 |  |
Subsequent Event | 7.125% senior notes |  |  |
Maturities of Long-term Debt [Abstract] |  |  |
Extinguishment of debt, amount | 300,000 |  |
Subsequent Event | 4.875% senior notes |  |  |
Maturities of Long-term Debt [Abstract] |  |  |
Extinguishment of debt, amount | $ 300,000 |  |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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