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Income Taxes (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Current: [Abstract] |  |  |
Federal | $ 8,319 | $ 33,631 | $ 22,466
State | 1,242 | 4,306 | 2,133
Current Income Tax Expense (Benefit) | 9,561 | 37,937 | 24,599
Deferred: [Abstract] |  |  |
Federal | 12,477 | (2,102) | 4,367
State | 2,054 | (919) | 489
Deferred Income Tax Expense (Benefit) | 14,531 | (3,021) | 4,856
Income tax expense (benefit) | 24,092 | 34,916 | 29,455
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation | $ 5,413 | 2,109 | 3,612
Income tax provision [Abstract] |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate | 35.00% |  |
Tax expense at the statutory rate | $ 27,883 | 33,630 | 29,373
State income taxes, net of federal benefit | 2,178 | 1,879 | 1,876
Non-deductible transaction costs | 394 |  |
Qualified stock options | (120) | (96) | (908)
Meals and entertainment | 216 | 186 | 139
Deferred tax asset valuation allowance | (11) | 39 | (85)
Federal qualified property deductions | (6,066) |  |
Federal income tax credits | (732) | (533) | (1,023)
Other | 350 | (189) | 83
Income tax expense (benefit) | 24,092 | 34,916 | 29,455
Deferred Tax Liabilities and Assets [Abstract] |  |  |
Accrued expenses | 11,952 | 6,313 |
Allowance for doubtful accounts | 936 | 1,002 |
Share-based compensation | 5,242 | 5,698 |
Accruals for income tax contingencies | 268 | 300 |
Impairment of goodwill and other intangible assets | 216 | 534 |
Net operating loss carryforwards | 13,620 | 280 |
Total deferred tax assets | 32,234 | 14,127 |
Valuation allowance | (284) | (273) |
Total deferred tax assets, net of valuation allowance | 31,950 | 13,854 |
Tax over book depreciation | 28,027 | 19,222 |
Intangible assets | 25,399 | 3,639 |
Prepaid expenses deductible when paid | 5,018 | 2,488 |
Goodwill | 13,382 | 11,189 |
Deferred Tax Liabilities, Gross | 71,826 | 36,538 |
Net deferred tax liabilities | (39,876) | (22,684) |
Federal net operating loss | 36,034 |  |
Operating Loss Carryforwards, State and Local | 23,595 | 6,500 |
Balance sheet classification of deferred income taxes [Abstract] |  |  |
Deferred tax liabilites, noncurrent | (39,876) | (22,684) |
Income taxes paid | 25,264 | 30,087 | 25,168
Increase (Decrease) in valuation allowance for state loss carryforwards | 11 | 39 |
Reconciliation of Unrecognized Tax Benefits [Roll Forward] |  |  |
Balance at beginning of year | 771 | 1,339 | 277
Additions for tax positions of current year | 66 | 66 | 209
Additions for tax positions of prior years |  | 63 | 853
Reductions for settlement with state taxing authorities | (64) | (697) |
Balance at end of year | 773 | 771 | $ 1,339
Income tax penalties accrued | 156 | 170 |
Interest on income taxes accrued | $ 371 | $ 414 |

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