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Noncontrolling Interest (Details)
1 Months Ended 3 Months Ended 6 Months Ended
Mar. 31, 2017
USD ($)
building
property
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
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%        
Noncontrolling interest, ownership percentage by parent 55.00%        
Proceeds from noncontrolling interest, net $ 255,813,000     $ 255,813,000 $ 0
Noncontrolling interest in variable interest equity 181,859,000        
Adjustments to additional paid in capital, difference between net proceeds received and fair value of noncontrolling interest equity 73,954,000        
Comprehensive income attributable to noncontrolling interest   $ 1,360,000 $ 0 1,486,000 0
Cash distribution for joint venture partners   3,483,000   3,483,000 $ 0
Variable interest entity, consolidated, carrying amount, real estate assets   999,346,000   999,346,000  
Variable interest entity, consolidated, carrying amount, mortgage debt   $ 620,000,000   $ 620,000,000  
Third Party Investor          
Noncontrolling Interest [Line Items]          
Noncontrolling interest, increase from business combination $ 260,891,000