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Commitments and Contingencies (Details) - USD ($)
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Commitments and Contingencies Disclosure [Abstract]    
Operating lease rent expense $ 4,236,000 $ 4,217,000
Contingent rent 0 $ 0
Contingent liability under letters of credit 60,588,000  
Outstanding obligations under construction agreements $ 31,916,000