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Summary of Significant Accounting Policies - Narrative (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2017
USD ($)
revenue_stream
joint_venture
Variable Interest Entity [Line Items]    
Number of revenue streams related to non-lease components | revenue_stream   3
Number of revenue streams with a change in accounting principle effective January 1, 2018 | revenue_stream   2
Rental revenue and tenant recoveries | $ $ 175,300 $ 501,400
Indirect leasing costs capitalized during period | $ 1,800 5,000
Future undiscounted minimum lease payments on ground leases | $ $ 456,276 $ 456,276
VIE, Primary Beneficiary    
Variable Interest Entity [Line Items]    
Number of joint ventures meeting VIE definition | joint_venture   4
Number of joint ventures consolidated | joint_venture   3
VIE, Not Primary Beneficiary    
Variable Interest Entity [Line Items]    
Number of joint ventures not consolidated | joint_venture   1
Ownership interest   21.00%