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Derivative and Other Fair Value Instruments - Summary of Carrying and Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Carrying Value [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Total debt, net | $ 8,817,939 | $ 8,957,291
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Total debt, net | 8,833,928 | 9,235,128
Mortgage Notes Payable, Net [Member] | Carrying Value [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Total debt, net | 2,385,470 | 3,618,722
Mortgage Notes Payable, Net [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Total debt, net | 2,352,502 | 3,615,384
Unsecured Debt [Member] | Carrying Value [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Total debt, net | 6,432,469 | 5,338,569
Unsecured Debt [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Total debt, net | $ 6,481,426 | $ 5,619,744

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- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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