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Summary of Significant Accounting Policies - Narrative (Details)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
revenue_stream
joint_venture
Dec. 31, 2016
joint_venture
Variable Interest Entity [Line Items]      
Number of joint ventures consolidated (in joint ventures) | joint_venture   4  
Number of revenue streams identified | revenue_stream   3  
Number of revenue streams with a change in accounting principle effective January 1, 2018 | revenue_stream   2  
Number of revenue streams with a change in accounting principle effective January 1, 2019 | revenue_stream   1  
Indirect leasing costs capitalized during period | $ $ 1,700 $ 3,200  
Ground Lease      
Variable Interest Entity [Line Items]      
Future undiscounted minimum lease payments on ground leases | $ $ 458,173 $ 458,173  
Primary Beneficiary      
Variable Interest Entity [Line Items]      
Number of joint ventures consolidated (in joint ventures) | joint_venture   3  
Not Primary Beneficiary      
Variable Interest Entity [Line Items]      
Number of joint ventures consolidated (in joint ventures) | joint_venture   1 1