Intangible Assets and Goodwill - Reconciliation of Goodwill Balance (Details) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
		Dec. 31, 2019	Dec. 31, 2019		Dec. 31, 2018
Goodwill [Line Items]
Beginning balance, gross			$ 517,040		$ 517,040
Accumulated impairment			(182,360)		(182,360)
Beginning balance, net			334,680		334,680
Acquisition of Nutrisystem			445,671		0
Measurement period adjustment	[1]		11,384		0
Goodwill impairment		$ (137,100)	(137,100)	[2]	0	[2]
Ending balance, gross		974,095	974,095		517,040
Accumulated impairment		(319,460)	(319,460)		(182,360)
Ending balance, net		654,635	654,635		334,680
Healthcare
Goodwill [Line Items]
Beginning balance, gross			517,040		517,040
Accumulated impairment			(182,360)		(182,360)
Beginning balance, net			334,680		334,680
Acquisition of Nutrisystem			0		0
Measurement period adjustment	[1]		0		0
Goodwill impairment	[2]		0		0
Ending balance, gross		517,040	517,040		517,040
Accumulated impairment		(182,360)	(182,360)		(182,360)
Ending balance, net		334,680	334,680		334,680
Nutrition
Goodwill [Line Items]
Beginning balance, gross			0
Accumulated impairment			0
Beginning balance, net			0
Acquisition of Nutrisystem			445,671
Measurement period adjustment	[1]		11,384
Goodwill impairment		(137,100)	(137,100)	[2]
Ending balance, gross		457,055	457,055		0
Accumulated impairment		(137,100)	(137,100)		0
Ending balance, net		$ 319,955	$ 319,955		$ 0

[1] See Note 2 for explanation.

[2] See Note 13 for explanation.