Almost Family Merger - Preliminary Merger Consideration (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	Apr. 01, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Combinations [Abstract]
Outstanding shares of Almost Family common stock as of April 1, 2018 (in shares)	13,951,134
Exchange ratio	91.50%
Shares of the Company issued (in shares)	12,765,288
Price per share as of April 1, 2018 (in dollars per share)	$ 61.56
Fair value of the Company common stock issued	$ 785,831
Fair value of vested Almost Family equity awards exchanged for equity awards in the Company	9,581
Preliminary merger consideration	$ 795,412	$ 795,412	$ 0	$ 0