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Commitments and Contingencies - Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]      
Ground rent expenses $ 17,709,000 $ 18,442,000 $ 16,495,000
Contingent rent incurred 0 $ 0 $ 0
Contingent liability under letters of credit 65,814,000    
Outstanding obligations under construction agreements $ 8,360,000