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Income Taxes - Current and Long-Term Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Income Tax Disclosure [Abstract] |  |
Accrued liabilities | $ 81,302 | $ 67,577
Operating leases | 51,450 | 54,860
Loss and credit carryforwards | 23,852 | 14,372
Assets relating to equity compensation | 14,981 | 16,842
Other assets | 16,290 | 20,364
Gross deferred tax assets | 187,875 | 174,015
Property, equipment and leasehold improvements | (9,852) | (15,137)
Intangible assets | (172,723) | (212,498)
Prepaid expenses | (46,105) | (49,221)
Other liabilities | (13,152) | (5,799)
Gross deferred tax liabilities | (241,832) | (282,655)
Valuation allowance | (15,717) | (1,556)
Net deferred tax liabilities | $ (69,674) | $ (110,196)

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