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Debt Obligations, net (Future Scheduled Maturities) (Details) - USD ($) $ in Thousands | 1 Months Ended |  |
--- | --- | --- | ---
Nov. 01, 2018 | Sep. 30, 2018 | Dec. 31, 2017
Maturities of Long-term Debt [Abstract] |  |  |
2018 (remaining three months) |  | $ 107,428 |
2019 |  | 497,747 |
2020 |  | 400,000 |
2021 |  | 543,593 |
2022 |  | 1,119,957 |
Thereafter |  | 998,653 |
Total principal maturities |  | 3,667,378 | $ 3,539,991
Unamortized discounts and deferred financing costs, net |  | (54,569) | (63,591)
Total debt obligations, net |  | 3,612,809 | 3,476,400
Unsecured Debt |  |  |
Maturities of Long-term Debt [Abstract] |  |  |
2018 (remaining three months) |  | 0 |
2019 |  | 497,000 |
2020 |  | 400,000 |
2021 |  | 275,000 |
2022 |  | 1,062,500 |
Thereafter |  | 100,000 |
Total principal maturities |  | 2,334,500 |
Unamortized discounts and deferred financing costs, net |  | (44,655) |
Total debt obligations, net |  | 2,289,845 |
Secured Debt |  |  |
Maturities of Long-term Debt [Abstract] |  |  |
2018 (remaining three months) |  | 107,428 |
2019 |  | 747 |
2020 |  | 0 |
2021 |  | 268,593 |
2022 |  | 57,457 |
Thereafter |  | 898,653 |
Total principal maturities |  | 1,332,878 |
Unamortized discounts and deferred financing costs, net |  | (9,914) |
Total debt obligations, net |  | 1,322,964 |
5.00% senior notes |  |  |
Maturities of Long-term Debt [Abstract] |  |  |
Total principal maturities |  | $ 497,000 | $ 770,000
5.00% senior notes | Subsequent Event |  |  |
Debt Instrument [Line Items] |  |  |
Aggregate principal amount called for redemption | $ 122,000 |  |

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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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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: 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(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: 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 Reference 3: 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 + Details
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