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Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Deferred tax assets: |  |
Accrued expenses | $ 14,837 | $ 12,095
Allowance for doubtful accounts | 839 | 577
Operating lease liabilities | 37,967 | 31,309
Share-based compensation | 3,769 | 3,554
Accruals for income tax contingencies | 154 | 166
Capital loss carryforwards | 4,230 | 0
Net operating loss carryforwards | 647 | 671
Total gross deferred tax assets | 62,443 | 48,372
Valuation allowance | (4,625) | (395)
Total net deferred tax assets | 57,818 | 47,977
Deferred tax liabilities: |  |
Tax over book depreciation | 27,880 | 24,964
Prepaid expenses | 5,615 | 6,499
Operating lease right-of-use assets | 38,010 | 31,277
Goodwill | 20,502 | 17,368
Intangible assets | 9,218 | 9,855
Total deferred tax liabilities | 101,225 | 89,963
Net deferred tax liabilities | $ (43,407) | $ (41,986)

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