Goodwill and Intangible Assets, Net - Intangible Assets, Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 412,514	$ 403,438
Accumulated Amortization	104,055	68,402
Total future amortization of intangible assets	308,459	335,036
Amortization of Intangible Assets	$ 37,700	$ 27,200	$ 22,800
Corporate trade name
Finite-Lived Intangible Assets [Line Items]
Weighted- Average Remaining Useful Life	14 years 2 months 12 days	15 years 2 months 12 days
Gross Carrying Amount	$ 23,300	$ 23,300
Accumulated Amortization	4,891	3,511
Total future amortization of intangible assets	$ 18,409	$ 19,789
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Weighted- Average Remaining Useful Life	16 years 9 months 18 days	18 years 1 month 6 days
Gross Carrying Amount	$ 291,519	$ 281,219
Accumulated Amortization	44,750	29,184
Total future amortization of intangible assets	$ 246,769	$ 252,035
Technology
Finite-Lived Intangible Assets [Line Items]
Weighted- Average Remaining Useful Life	2 years	3 years
Gross Carrying Amount	$ 82,922	$ 82,922
Accumulated Amortization	49,760	31,764
Total future amortization of intangible assets	$ 33,162	$ 51,158
Below Market Leases
Finite-Lived Intangible Assets [Line Items]
Weighted- Average Remaining Useful Life	2 years 2 months 12 days	4 years
Gross Carrying Amount	$ 2,048	$ 4,097
Accumulated Amortization	1,334	3,003
Total future amortization of intangible assets	$ 714	$ 1,094
Provider network contracts
Finite-Lived Intangible Assets [Line Items]
Weighted- Average Remaining Useful Life	3 years 8 months 12 days	4 years 7 months 6 days
Gross Carrying Amount	$ 12,725	$ 11,900
Accumulated Amortization	3,320	940
Total future amortization of intangible assets	$ 9,405	$ 10,960