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v3.20.4

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) |

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