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Goodwill (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Goodwill [Roll Forward]    
Goodwill at the beginning of year $ 303,887 $ 287,956
Increase in goodwill related to acquisitions 0 16,777
Decrease in goodwill related to divestitures (4,197) 0
Decrease in goodwill related to impairments (509) (846)
Goodwill at the end of the period $ 299,181 $ 303,887