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Goodwill (Tables)
12 Months Ended
Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes in Goodwill
The following table presents changes in goodwill in the accompanying Consolidated Balance Sheet (in thousands): 
December 31, 2019December 31, 2020
Goodwill at the beginning of year$303,887 $398,292 
Net increase in goodwill related to acquisitions99,344 14,054 
Decrease in goodwill related to divestitures(4,197)(5,736)
Decrease in goodwill related to impairments(742)(13,632)
Goodwill at the end of the year$398,292 $392,978