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Commitments and Contingencies (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Commitments and Contingencies Disclosure [Abstract]        
Operating lease rent expense $ 2,592,000 $ 2,406,000 $ 5,168,000 $ 4,917,000
Contingent rent 0 $ 0 0  
Contingent liability under letters of credit 61,002,000   61,002,000  
Outstanding obligations under construction agreements $ 73,843,000   $ 73,843,000