Income Taxes - Deferred Portion of Tax Provision (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Accrued expenses, deducted for tax when paid	$ (23,456)	$ 41,953	$ (32,741)
Internal-use software and capitalized costs	(11,054)	(7,930)	462
Depreciation	(330)	4,608	(2,286)
Unrealized gains (losses) from investments held in employee deferred compensation trusts	19,139	(26,009)	8,167
Other, net	(937)	1,695	5,000
Deferred portion of the tax provision (benefit)	$ (16,638)	$ 14,317	$ (21,398)