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Goodwill (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Goodwill [Roll Forward]    
Beginning balance $ 271,338 $ 226,806
Goodwill acquired during the year 19,778 44,292
Goodwill adjustments for purchase price allocation of businesses acquired in prior year 2,409 706
Goodwill written-off - closed clinic 0 (466)
Ending balance $ 293,525 $ 271,338