Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis (Details)

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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis (Details) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Total Gain (loss) on long-lived assets held and used $ (27,414,000) $ (4,894,000) $ (8,063,000)
Total Gain (loss) on goodwill 0 $ (900,000)  
Non-recurring basis      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Long-lived assets held and used 1,178,489,000    
Goodwill 509,592,000    
Franchise assets 65,700,000    
Total Gain (loss) on long-lived assets held and used (26,604,000)    
Total Gain (loss) on goodwill 0    
Total Gain (loss) on franchise assets (2,100,000)    
Non-recurring basis | Significant Unobservable Inputs (Level 3) as of December 31, 2018      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Long-lived assets held and used 1,178,489,000    
Goodwill 509,592,000    
Franchise assets $ 65,700,000