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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