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Equity and Capital - Noncontrolling Interest of Limited Partners (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Limited Partners' Capital Account [Line Items] |  |  |
Document Fiscal Year Focus | 2018 |  |
General Partners' Capital Account, Units Outstanding | 167,904,593 | 171,365,000 |
Limited Partners' Capital Account, Units Outstanding | 350,000 | 350,000 |
Partners' Capital Account, Units | 168,254,495 | 171,715,000 |
Parent Company, Ownership Percentage of Outstanding Common Partnership Units of Operating Partnership | 99.80% | 99.80% |
Parent Company [Member] |  |  |
Limited Partners' Capital Account [Line Items] |  |  |
Partners' Capital Account, Contributions | $ 13,000 | $ 13,478 | $ 8,760
Parent Company [Member] | Noncontrolling Interest Exchangeable Operating Partnership Units [Member] |  |  |
Limited Partners' Capital Account [Line Items] |  |  |
Partners' Capital Account, Contributions | $ 0 | $ 13,100 | $ 0

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