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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Deferred income tax liabilities:      
Property and equipment $ (236,256) $ (208,751)  
Leased assets (77,344) (73,861)  
Goodwill (85,467) (72,244)  
Customer holdbacks (30,457) (11,882)  
Other intangibles (4,438) (11,384)  
Other book/tax accounting method differences 0 (1,801)  
Total deferred income tax liabilities (433,962) (379,923)  
Deferred income tax assets:      
Net operating loss carryforwards 82,817 78,310  
Lease liabilities 76,826 74,044  
Tax credits 42,202 46,621  
Accruals and reserves 70,335 36,372  
Stock and incentive compensation 36,590 26,045  
Deferred tax benefits on unrecognized tax positions 10,108 16,542  
Other 9,617 3,933  
Subtotal 328,495 281,867  
Valuation allowance (43,255) (104,178) $ (67,600)
Total deferred income tax assets 285,240 177,689  
Total net deferred income tax liabilities $ (148,722) $ (202,234)