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Related-Party Transactions (Details) - USD ($)
$ in Thousands
9 Months Ended
Jul. 05, 2017
Sep. 30, 2017
Sep. 30, 2016
Related Party Transaction [Line Items]      
Payments to acquire real estate   $ 111,790 $ 6,733
Real estate held-for-sale   8,200 $ 24,100
Chief Executive Officer | Purchase of Former Residence      
Related Party Transaction [Line Items]      
Period of execution of employment agreement 120 days    
Payments to acquire real estate $ 4,400    
Real estate held-for-sale   $ 3,900