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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Accrued liabilities not currently deductible:    
Employee compensation and benefits $ 104,305 $ 116,162
Project and non-project reserves 71,999 60,768
Net operating loss carryforward 326,402 357,803
Tax basis of investment in excess of book basis 118,915 88,255
U.S. foreign tax credit carryforward 414,348 226,845
AOCI 62,681 67,258
Other 103,955 85,059
Total deferred tax assets 1,202,605 1,002,150
Valuation allowance (1,080,752) (910,336)
Deferred tax assets, net 121,853 91,814
Deferred tax liabilities:    
Book basis of property and equipment in excess of tax basis (43,475) (29,846)
Dividend withholding on unremitted non-U.S. earnings (57,859) (49,663)
Other (23,349) (32,912)
Total deferred tax liabilities (124,683) (112,421)
Deferred tax assets, net of deferred tax liabilities $ (2,830) $ (20,607)