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Noncontrolling Interest (Details)
$ in Thousands
1 Months Ended 3 Months Ended
Mar. 31, 2017
USD ($)
building
property
Mar. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
Noncontrolling Interest [Line Items]      
Number of properties included in joint venture agreement | property 1    
Number of buildings included in joint venture agreement | building 2    
Noncontrolling interest, ownership percentage by noncontrolling owners 45.00%   45.00%
Noncontrolling interest, ownership percentage by parent 55.00%   55.00%
Proceeds from noncontrolling interest, net $ 255,931 $ 0 $ 255,813
Noncontrolling interest in variable interest equity 181,859   181,859
Adjustments to additional paid in capital, difference between net proceeds received and fair value of noncontrolling interest equity 74,072    
Comprehensive income attributable to noncontrolling interest   (1,383) (126)
Cash distribution for joint venture partners   5,667 $ 0
Variable interest entity, consolidated, carrying amount, real estate assets   759,654  
Variable interest entity, consolidated, carrying amount, mortgage debt   $ 620,000  
Third Party Investor      
Noncontrolling Interest [Line Items]      
Noncontrolling interest, increase from business combination $ 261,009