Income Taxes - Current and Long-Term Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Accrued liabilities	$ 67,577	$ 96,292
Operating leases	54,860	0
Loss and credit carryforwards	14,372	14,830
Assets relating to equity compensation	16,842	19,653
Other assets	20,364	14,092
Gross deferred tax assets	174,015	144,867
Property, equipment and leasehold improvements	(15,137)	(3,421)
Intangible assets	(212,498)	(263,548)
Prepaid expenses	(49,221)	(41,926)
Other liabilities	(5,799)	(12,100)
Gross deferred tax liabilities	(282,655)	(320,995)
Valuation allowance	(1,556)	(4,066)
Net deferred tax liabilities	$ (110,196)	$ (180,194)