Income Tax - Income Tax Expense Differs from Computed Income Tax at Statutory Rates (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Statutory income tax rate	37.50%
Computed income tax at statutory rates	$ 68,139	$ 46,445	$ 43,753
Differences in tax rates due to multiple jurisdictions	2,003	839	1,058
Excess tax benefits on share-based compensation	(1,023)	(1,094)	(1,779)
Effect of income subject to tax-exemption grant	(46,762)	(31,347)	(31,424)
Unrecognized tax (benefit) expense	(3,388)	1,322	(32)
Other, net	1,593	2,837	1,399
Income tax expense	$ 20,562	$ 19,002	$ 12,975