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Goodwill (Details)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
USD ($)
Jun. 30, 2021
USD ($)
divestiture
Dec. 31, 2019
USD ($)
Goodwill [Roll Forward]      
Goodwill at the beginning of year   $ 392,978 $ 398,292
Increase in goodwill related to acquisitions $ 0   14,054
Decrease in goodwill related to divestitures   (1,006) (5,736)
Decrease in goodwill related to impairments   0 $ (13,632)
Goodwill at the end of the period $ 391,972 $ 391,972  
Number of Businesses Sold (Goodwill Allocation) | divestiture   1