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Goodwill and Other Intangible Assets Rollforward (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Goodwill [Line Items]      
Balance, beginning of year $ 831,151,000 $ 295,609,000  
Merger and other acquisitions 554,000 543,716,000  
Effect of foreign currency translation 2,061,000 (8,276,000)  
Other adjustments (2,621,000) 102,000  
Balance, end of year 831,145,000 831,151,000 $ 295,609,000
Goodwill impairment 0 0 7,913,000
United States      
Goodwill [Line Items]      
Balance, beginning of year 746,204,000 222,901,000  
Merger and other acquisitions 414,000 523,303,000  
Effect of foreign currency translation 0 0  
Other adjustments (2,621,000) 0  
Balance, end of year 743,997,000 746,204,000 222,901,000
Latin America Operations      
Goodwill [Line Items]      
Balance, beginning of year 84,947,000 72,708,000  
Merger and other acquisitions 140,000 20,413,000  
Effect of foreign currency translation 2,061,000 (8,276,000)  
Other adjustments 0 102,000  
Balance, end of year $ 87,148,000 $ 84,947,000 $ 72,708,000