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Fair Value Measurements - Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Document Fiscal Year Focus | 2018 |
Financing Receivable, Net | $ 0 | $ 15,803
Notes Payable | 3,006,478 | 2,971,715
Unsecured Debt | 708,734 | 623,262
Fair Value, Inputs, Level 3 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Notes Receivable, Fair Value | 0 | 15,660
Fair Value, Inputs, Level 2 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Notes Payable, Fair Value | 2,961,769 | 3,058,044
Fair Value, Inputs, Level 2 [Member] | Unsecured Credit Facilities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt Instrument, Fair Value Disclosure | $ 710,902 | $ 625,000

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