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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Accrued liabilities not currently deductible:    
Employee compensation and benefits $ 28,410 $ 117,981
Employee time-off accrual 58,500 94,134
Project and non-project reserves 40,966 46,219
Tax basis of investments in excess of book basis   69,195
Net operating loss carryforward 184,517 180,450
U.S. foreign tax credit carryforward 168,027  
Other comprehensive loss 71,537 271,878
Other 66,286 34,147
Total deferred tax assets 618,243 814,004
Valuation allowance for deferred tax assets (99,529) (81,360)
Deferred tax assets, net 518,714 732,644
Deferred tax liabilities:    
Book basis of property, equipment and other capital costs in excess of tax basis (86,780) (88,262)
Residual U.S. tax on unremitted non-U.S. earnings   (161,827)
Dividend withholding on unremitted non-U.S. earnings (42,201)  
Other (73,261) (28,446)
Total deferred tax liabilities (202,242) (278,535)
Deferred tax assets, net of deferred tax liabilities $ 316,472 $ 454,109