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Debt Obligations (Debt Maturities) (Details) - USD ($) | Sep. 30, 2017 | Dec. 31, 2016 | Jul. 25, 2016
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Debt Disclosure [Abstract] |  |  |
Accrued interest | $ 27,200,000 | $ 34,100,000 |
Future expected/scheduled maturities of outstanding debt and capital lease |  |  |
2017 (remaining three months) | 13,165,000 |  |
2018 | 227,892,000 |  |
2019 | 618,437,000 |  |
2020 | 673,217,000 |  |
2021 | 686,225,000 |  |
Thereafter | 3,525,453,000 |  |
Total debt maturities | 5,744,389,000 |  |
Net unamortized premiums and discounts | 2,838,000 |  |
Net unamortized debt issuance costs | (33,539,000) |  |
Total debt obligations, net | 5,713,688,000 | 5,838,889,000 |
Debt Instrument [Line Items] |  |  |
Long-term debt | 5,744,389,000 |  |
Unsecured debt |  |  |
Future expected/scheduled maturities of outstanding debt and capital lease |  |  |
Total debt maturities | 3,218,453,000 | 2,318,453,000 |
Net unamortized debt issuance costs | (23,306,000) | (17,402,000) |
Debt Instrument [Line Items] |  |  |
Long-term debt | $ 3,218,453,000 | $ 2,318,453,000 |
Unsecured debt | Revolving Credit Facility |  |  |
Debt Instrument [Line Items] |  |  |
Credit facility maximum borrowing capacity |  |  | $ 2,750,000,000.00

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- Definition Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13,16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 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 + Details
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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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