Income Taxes - Deferred Income Taxes (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deferred Tax Assets
Net operating loss and other tax credit carryforwards	$ 55,147	$ 49,869
Basis differences — foreign investments	52,705	43,089
Unearned and deferred compensation	15,895	9,753
Lease liability	14,752	14,144
Other	374	0
Total deferred tax assets	138,873	116,855
Valuation allowance	(108,812)	(86,069)
Net deferred tax assets	30,061	30,786
Deferred Tax Liabilities
Basis differences — foreign investments	(145,524)	(145,838)
Right of use asset	(12,637)	(12,618)
Basis differences — equity investees	(1,195)	(2,364)
Deferred revenue	0	(97)
Other	0	(632)
Total deferred tax liabilities	(159,356)	(161,549)
Net Deferred Tax Liability	$ (129,295)	$ (130,763)