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Goodwill and Other Intangible Assets - Goodwill Roll-forward (Details) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Goodwill [Line Items]    
Balance, beginning of year $ 917,419,000 $ 831,145,000
Merger and other acquisitions 27,306,000 86,968,000
Effect of foreign currency translation 5,175,000 (694,000)
Other adjustments (1,257,000)  
Balance, end of year 948,643,000 917,419,000
Goodwill impairment 0 0
United States    
Goodwill [Line Items]    
Balance, beginning of year 759,538,000 743,997,000
Merger and other acquisitions 11,773,000 15,541,000
Effect of foreign currency translation 0 0
Other adjustments 0  
Balance, end of year 771,311,000 759,538,000
Latin America Operations    
Goodwill [Line Items]    
Balance, beginning of year 157,881,000 87,148,000
Merger and other acquisitions 15,533,000 71,427,000
Effect of foreign currency translation 5,175,000 (694,000)
Other adjustments (1,257,000)  
Balance, end of year $ 177,332,000 $ 157,881,000