Annual report pursuant to Section 13 and 15(d)

Intangible Assets and Goodwill - Changes in Carrying Amount of Franchise Assets and Goodwill (Details)

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Intangible Assets and Goodwill - Changes in Carrying Amount of Franchise Assets and Goodwill (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Net Goodwill      
Beginning balance $ 525,780,000 $ 472,437,000  
Additions through current year acquisitions 0    
Prior year acquisition allocations 0 59,980,000  
Reductions from dispositions (16,188,000) (5,737,000)  
Reductions from impairment 0 (900,000)  
Ending balance 509,592,000 525,780,000  
Net of accumulated impairment losses 797,600,000 797,600,000 $ 796,700,000
Franchise assets      
Franchise Assets      
Beginning balance 69,900,000 74,900,000  
Additions through current year acquisitions 0    
Prior year acquisition allocations 0    
Reductions from dispositions (2,100,000) (1,400,000)  
Reductions from impairment (2,100,000) (3,600,000)  
Ending balance 65,700,000 69,900,000  
Continuing operations | Franchise assets      
Franchise Assets      
Reductions from impairment $ (2,100,000) $ (3,600,000)