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Income Taxes Income Tax Provision (Tables) | 12 Months Ended
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Dec. 31, 2017
Income Tax Disclosure [Abstract] |
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] | The provision for income taxes consists of the following:
| 2017 |  | 2016 |  | 2015
Current: |  |  |  |  |
Federal | $ | 28,556 |  |  | $ | 24,139 |  |  | $ | 8,319 |
State | 4,043 |  |  | 3,052 |  |  | 1,242 |
| 32,599 |  |  | 27,191 |  |  | 9,561 |
Deferred: |  |  |  |  |  |  |
Federal | (12,011 | ) |  | 3,256 |  |  | 12,477 |
State | (457 | ) |  | 269 |  |  | 2,054 |
| (12,468 | ) |  | 3,525 |  |  | 14,531 |
| $ | 20,131 |  |  | $ | 30,716 |  |  | $ | 24,092 |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] | The historical income tax expense differs from the amounts computed by applying the federal statutory rate of 35.0% to income before income taxes as follows:
| 2017 |  | 2016 |  | 2015
Tax expense at the statutory rate | $ | 37,608 |  |  | $ | 20,435 |  |  | $ | 27,883 |
State income taxes, net of federal benefit | 2,339 |  |  | 2,229 |  |  | 2,178 |
Non-deductible transaction costs | — |  |  | — |  |  | 394 |
Share based compensation | (366 | ) |  | — |  |  | — |
Incentive stock options | 32 |  |  | (88 | ) |  | (120 | )
Other permanent differences | 252 |  |  | 474 |  |  | 216 |
TQI goodwill impairment | — |  |  | 8,990 |  |  | — |
Deferred tax asset valuation allowance | 78 |  |  | (2 | ) |  | (11 | )
Federal qualified property deductions | (2,075 | ) |  | (1,311 | ) |  | (6,066 | )
Federal income tax credits | (58 | ) |  | — |  |  | (732 | )
Non-taxable acquisitions | (568 | ) |  | — |  |  | — |
Rate impact on deferred tax liabilities | (15,901 | ) |  | — |  |  | — |
Other | (1,210 | ) |  | (11 | ) |  | 350 |
| $ | 20,131 |  |  | $ | 30,716 |  |  | $ | 24,092 |
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] | Significant components of the Company’s deferred tax liabilities and assets are as follows:
| December 31, 2017 |  | December 31, 2016
Deferred tax assets: |  |  |
Accrued expenses | $ | 7,905 |  |  | $ | 9,647 |
Allowance for doubtful accounts | 777 |  |  | 662 |
Share-based compensation | 3,002 |  |  | 5,005 |
Accruals for income tax contingencies | 251 |  |  | 252 |
Net operating loss carryforwards | 4,733 |  |  | 10,231 |
Total deferred tax assets | 16,668 |  |  | 25,797 |
Valuation allowance | (360 | ) |  | (282 | )
Total deferred tax assets, net of valuation allowance | 16,308 |  |  | 25,515 |
Deferred tax liabilities: |  |  |
Tax over book depreciation | 19,402 |  |  | 29,416 |
Intangible assets | 11,108 |  |  | 17,588 |
Prepaid expenses deductible when paid | 3,460 |  |  | 4,862 |
Goodwill | 11,741 |  |  | 15,520 |
Total deferred tax liabilities | 45,711 |  |  | 67,386 |
Net deferred tax liabilities | $ | (29,403 | ) |  | $ | (41,871 | )
Summary of Positions for which Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Table Text Block] | A reconciliation of the beginning and ending amount of unrecognized tax benefit is as follows:
| Liability for
| Unrecognized Tax
| Benefits
Balance at December 31, 2014 | 771 |
Reductions for settlement with state taxing authorities | (64 | )
Additions for tax positions of current year | 66 |
Balance at December 31, 2015 | 773 |
Reductions for settlement with state taxing authorities | (247 | )
Additions for tax positions of current year | 56 |
Balance at December 31, 2016 | $ | 582 |
Reductions for settlement with state taxing authorities | $ | (14 | )
Additions for tax positions of prior years | $ | 400 |
Additions for tax positions of current year | $ | 366 |
Balance at December 31, 2017 | $ | 1,334 |

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319 + Details
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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319 + Details
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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32687-109319 + Details
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- Definition Tabular disclosure of unrecognized tax benefits for which a material change is reasonably possible in the next twelve months, typically including the nature of the uncertainty, the event(s) that could cause a material change, and an estimate of the range of the reasonably possible change or a statement that an estimate of the range cannot be made. An unrecognized tax benefit is the difference between a tax position taken in a tax return and the amounts recognized in the financial statements for which it is more likely than not, based on the technical merits of the position, that the tax position will not be sustained upon examination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32718-109319 + Details
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