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Franchise Arrangements (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Franchise Arrangements [Line Items]    
Property and equipment, net $ 890,736 $ 847,966
Property And Equipment Under Franchise Arrangements [Member]    
Franchise Arrangements [Line Items]    
Property and equipment, net 138,587 140,000
Land $ 41,057 $ 39,273
Initial Franchise Fee [Member]    
Franchise Arrangements [Line Items]    
Finite-lived intangible asset, useful life 20 years