Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Accrued liabilities not currently deductible:
Employee compensation and benefits	$ 138,034	$ 104,305
Project and non-project reserves	67,861	71,999
Net operating loss carryforward	346,561	326,402
Tax basis of investment in excess of book basis	144,019	118,915
U.S. foreign tax credit carryforward	455,912	414,348
AOCI	26,982	62,681
Other	26,794	103,955
Total deferred tax assets	1,206,163	1,202,605
Valuation allowance	(1,114,574)	(1,080,752)
Deferred tax assets, net	91,589	121,853
Deferred tax liabilities:
Book basis of property and equipment in excess of tax basis	(31,197)	(43,475)
Dividend withholding on unremitted non-U.S. earnings	(55,080)	(57,859)
Other	(21,539)	(23,349)
Total deferred tax liabilities	(107,816)	(124,683)
Deferred tax assets, net of deferred tax liabilities	$ (16,227)	$ (2,830)