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Business Combination - Acquisition of Cloverleaf, Narrative (Details)
$ in Thousands
12 Months Ended
May 01, 2019
USD ($)
expansion_opportunity
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Business Acquisition [Line Items]          
Goodwill   $ 318,483 $ 186,095 $ 188,169 $ 186,805
Cloverleaf          
Business Acquisition [Line Items]          
Goodwill $ 107,643 125,940      
Number of expansion opportunities | expansion_opportunity 3        
Deferred tax liability for intangibles $ 1,900        
Revenue since acquisition date   9,000      
Net income since acquistion date   152,800      
Customer Relationships | Cloverleaf          
Business Acquisition [Line Items]          
Acquired identifiable intangibles 241,738 $ 250,346      
Acquired identifiable intangibles, weighted average useful life   25 years      
Trademarks and Trade Names | Cloverleaf          
Business Acquisition [Line Items]          
Acquired identifiable intangibles $ 1,623 $ 1,623      
Acquired identifiable intangibles, weighted average useful life   1 year 6 months