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Income Taxes (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income taxes [Line Items] |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% | 21.00% | 35.00%
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation |  |  | $ 15,901
Current: [Abstract] |  |  |
Federal | $ 17,319 | $ 16,572 | 28,556
State | 4,925 | 3,559 | 4,043
Current Income Tax Expense (Benefit) | 22,244 | 20,131 | 32,599
Deferred: [Abstract] |  |  |
Federal | 5,561 | 7,194 | (11,860)
State | 1,207 | 870 | (457)
Deferred Income Tax Expense (Benefit) | 6,768 | 8,064 | (12,317)
Income Tax Expense (Benefit) | 29,012 | 28,195 | 20,282
Income tax provision [Abstract] |  |  |
Tax expense at the statutory rate | 24,383 | 25,252 | 37,637
State income taxes, net of federal benefit | 4,843 | 3,685 | 2,339
Share based compensation | (587) | (50) | (366)
Incentive stock options | 34 | 12 | 32
Other permanent differences | 189 | 150 | 252
Section 162(m) Limitation | 421 | 13 |
Deferred tax asset valuation allowance |  | 35 | 78
Federal qualified property deductions |  |  | (2,075)
Federal income tax credits | (183) | (207) | (58)
Non-taxable acquisitions |  |  | (568)
Rate impact of deferred tax liabilities |  |  | (15,901)
Other | (88) | (695) | (1,088)
Income Tax Expense (Benefit) | 29,012 | 28,195 | 20,282
Deferred Tax Liabilities and Assets [Abstract] |  |  |
Accrued expenses | 8,454 | 10,362 |
Allowance for doubtful accounts | 539 | 535 |
Operating lease obligations | 38,822 |  |
Share-based compensation | 3,881 | 3,526 |
Accruals for income tax contingencies | 185 | 217 |
Net operating loss carryforwards | 1,089 | 2,906 |
Total deferred tax assets | 52,970 | 17,546 |
Valuation allowance | (395) | (395) |
Total deferred tax assets, net of valuation allowance | 52,575 | 17,151 |
Tax over book depreciation | 26,816 | 25,606 |
Deferred Tax Liabilities, Prepaid Expenses | 4,356 | 3,902 |
Operating lease right-of-use assets | 38,822 |  |
Goodwill | 16,036 | 13,913 |
Intangible assets | 10,487 | 10,904 |
Deferred Tax Liabilities, Gross | 96,517 | 54,325 |
Net deferred tax liabilities | (43,942) | (37,174) |
Federal net operating loss | 2,000 | 10,258 | 18,586
Operating Loss Carryforwards, State and Local | 16,926 | 18,148 | 18,126
Balance sheet classification of deferred income taxes [Abstract] |  |  |
Deferred tax liabilites, noncurrent | (43,942) | (37,174) |
Income taxes paid | 20,121 | 21,064 | 36,110
Increase (Decrease) in valuation allowance for state loss carryforwards |  | 35 | 78
Reconciliation of Unrecognized Tax Benefits [Roll Forward] |  |  |
Balance at beginning of year | 1,058 | 1,334 | 582
Reductions for settlement with state taxing authorities | (99) | (271) | (14)
Reductions for tax positions of prior years |  | (40) |
Additions for tax positions of current year | 28 | 35 | 366
Additions for tax positions of prior years |  |  | 400
Balance at end of year | 987 | 1,058 | $ 1,334
Income tax penalties accrued | 104 | 61 |
Interest on income taxes accrued | $ 214 | $ 143 |

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- Definition Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e32123-109318 + Details
Name: | us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration