CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS’ EQUITY (DEFICIT) (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock Class A	Common Stock Class B	Additional Paid-in Capital	Retained Earnings (Accumulated Deficit)	Non-controlling Interests
Beginning balance (in shares) at Dec. 31, 2015		41,491	17,525
Beginning balance, amount at Dec. 31, 2015	$ 934,579	$ 415	$ 175	$ 342,063	$ 306,688	$ 285,238
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative-effect adjustment from adoption of new accounting principle	0			468	(329)	(139)
Stock-based compensation expense	16,147			16,147
Acceleration of unvested equity awards for Valence Health employees (in shares)		162
Acceleration of unvested equity awards for Valence Health employees	3,899	$ 2		3,897
Exercise of stock options (in shares)		221
Exercise of stock options	1,259	$ 0		1,259
Restricted stock units vested, net of shares withheld for taxes (in shares)		84
Restricted stock units vested, net of shares withheld for taxes	2,193	$ 0		2,193
Exchange of Class B common stock (in shares)		2,178	(2,178)
Exchange of Class B common stock	0	$ 22	$ (22)	28,220		(28,220)
Tax impact of Class B common stock exchange	1,606			1,606
Issuance of Class A common stock for business combinations (in shares)		8,451
Issuance of Class A common stock for business combinations	177,782	$ 67		177,715
Tax impact of Class A common stock issued for business combination	1,427			1,427
Reclassification of non-controlling interests	0			(19,745)		19,745
Net income (loss)	(226,778)				(159,742)	(67,036)
Ending balance (in shares) at Dec. 31, 2016		52,587	15,347
Ending balance, amount at Dec. 31, 2016	912,114	$ 506	$ 153	555,250	146,617	209,588
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative-effect adjustment from adoption of new accounting principle						0
Stock-based compensation expense	5,104			5,104
Exercise of stock options (in shares)		94
Exercise of stock options	542	$ 20		522
Restricted stock units vested, net of shares withheld for taxes (in shares)		60
Restricted stock units vested, net of shares withheld for taxes	(667)	$ 1		(668)
Shares retired upon release from Valence Health escrow (in shares)		(113)
Shares retired upon release from Valence Health escrow	0	$ (1)		1
Exchange of Class B common stock (in shares)		4,398	(4,398)
Exchange of Class B common stock	0	$ 44	$ (44)	59,585		(59,585)
Tax impact of Class B common stock exchange	2,796			2,796
Reclassification of non-controlling interests	0			(1,403)		1,403
Net income (loss)	(23,149)				(18,012)	(5,137)
Ending balance (in shares) at Mar. 31, 2017		57,026	10,949
Ending balance, amount at Mar. 31, 2017	$ 896,740	$ 570	$ 109	$ 621,187	$ 128,605	$ 146,269