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Goodwill (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2018
Goodwill [Roll Forward]    
Goodwill at the beginning of year $ 398,292 $ 303,887
Increase in goodwill related to acquisitions 12,036 99,344
Decrease in goodwill related to divestitures 0 (4,939)
Decrease in goodwill related to impairments (13,632) $ 0
Goodwill at the end of the period $ 396,696