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Goodwill (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2020
Dec. 31, 2018
Goodwill [Roll Forward]        
Goodwill at the beginning of year   $ 398,292 $ 398,292 $ 303,887
Increase in goodwill related to acquisitions $ 12,201     99,344
Decrease in goodwill related to divestitures     0 (4,939)
Decrease in goodwill related to impairments   $ (13,600) (13,632) $ 0
Goodwill at the end of the period $ 396,861   $ 396,861