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Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]    
Project and non-project reserves $ 34,225 $ 2,326
Employee compensation and benefits 59,624 1,609
Revenue and cost recognition 33,588  
Insurance accruals 19,204 962
Net operating losses 16,400 14,855
Lease liabilities 68,447 205
Tax credit carryforwards 8,969 377
Other 3,318 2,240
Valuation allowance (17,358) (6,668)
Total deferred tax assets 226,417 15,906
Deferred tax liabilities    
Intangible assets (29,543) (2,529)
Right of use assets (63,032)  
Revenue and cost recognition   (10,570)
Other (13,063) (3,367)
Total deferred tax liabilities (105,638) (16,466)
Net deferred tax (liabilities)   $ (560)
Net deferred tax assets $ 120,779