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Income Taxes (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income taxes [Line Items] |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% |  | 35.00%
Current: [Abstract] |  |  |
Federal | $ 11,914 | $ 15,612 | $ 15,643
State | 3,907 | 4,681 | 3,635
Current Income Tax Expense (Benefit) | 15,821 | 20,293 | 19,278
Deferred: [Abstract] |  |  |
Federal | 922 | 5,766 | 6,826
State | (150) | 1,323 | 764
Deferred Income Tax Expense (Benefit) | 772 | 7,089 | 7,590
Income Tax Expense (Benefit) | 16,593 | 27,382 | 26,868
Income tax provision [Abstract] |  |  |
Tax expense at the statutory rate | 14,566 | 23,038 | 24,241
State income taxes, net of federal benefit | 2,602 | 4,594 | 3,659
Share based compensation | (298) | (587) | (50)
Effective Income Tax Rate Reconciliation, Tax Settlement, Other, Amount | 48 | (5) | 139
Other permanent differences | 751 | 421 | 13
Section 162(m) Limitation | (400) |  |
Federal income tax credits | (37) | (83) | (186)
Other | (639) | 4 | (948)
Income Tax Expense (Benefit) | 16,593 | 27,382 | 26,868
Deferred Tax Liabilities and Assets [Abstract] |  |  |
Accrued expenses | 12,095 | 7,245 |
Allowance for doubtful accounts | 577 | 527 |
Operating lease obligations | 31,309 | 26,989 |
Share-based compensation | 3,554 | 3,881 |
Accruals for income tax contingencies | 166 | 185 |
Net operating loss carryforwards | 671 | 1,089 |
Total deferred tax assets | 48,372 | 39,916 |
Valuation allowance | (395) | (395) |
Total deferred tax assets, net of valuation allowance | 47,977 | 39,521 |
Tax over book depreciation | 24,964 | 23,795 |
Deferred Tax Liabilities, Prepaid Expenses | 6,499 | 4,043 |
Operating lease right-of-use assets | 31,277 | 26,992 |
Goodwill | 17,368 | 15,337 |
Intangible assets | 9,855 | 10,568 |
Deferred Tax Liabilities, Gross | 89,963 | 80,735 |
Net deferred tax liabilities | (41,986) | (41,214) |
Federal net operating loss |  | 2,000 | 10,258
Operating Loss Carryforwards, State and Local | 16,926 |  | 18,148
Balance sheet classification of deferred income taxes [Abstract] |  |  |
Deferred tax liabilites, noncurrent | (41,986) | (41,214) |
Income taxes paid | 13,463 | 19,959 | 20,894
Increase (Decrease) in valuation allowance for state loss carryforwards |  |  | 35
Reconciliation of Unrecognized Tax Benefits [Roll Forward] |  |  |
Balance at beginning of year | 987 | 1,058 |
Reductions for settlement with state taxing authorities | (466) | (99) |
Additions for tax positions of current year | 23 | 28 |
Balance at end of year | 544 | 987 | $ 1,058
Income tax penalties accrued | $ 168 | $ 281 |

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