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Commitments and Contingencies (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Commitments and Contingencies Disclosure [Abstract]        
Operating lease rent expense $ 4,572,000 $ 4,267,000 $ 8,808,000 $ 8,484,000
Contingent rent 0 $ 0 0 $ 0
Contingent liability under letters of credit 60,588,000   60,588,000  
Outstanding obligations under construction agreements $ 10,034,000   $ 10,034,000