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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2015
Income Tax Disclosure [Abstract] |
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] | Deferred tax assets and liabilities as of December 31 are as follows:
|  | 2015 |  | 2014
|  | (in thousands)
Deferred income tax assets: |  |  |  |
Allowance for doubtful accounts |  | $ | 562 |  |  | $ | 478 |
Accrued expenses |  | 9,212 |  |  | 8,969 |
Stock-based compensation |  | 529 |  |  | 677 |
Insurance accruals |  | 28,159 |  |  | 25,395 |
State net operating loss carryforward |  | 1,688 |  |  | 3,241 |
Indirect tax benefits of unrecognized tax benefits |  | 4,262 |  |  | 4,595 |
Other |  | 387 |  |  | 772 |
Total gross deferred tax assets |  | 44,799 |  |  | 44,127 |
Less valuation allowance |  | — |  |  | — |
Net deferred tax assets |  | 44,799 |  |  | 44,127 |
Deferred income tax liabilities: |  |  |  |  |
Property and equipment |  | (133,720 | ) |  | (125,611 | )
Goodwill |  | (3,725 | ) |  | (2,385 | )
Prepaid expenses |  | (2,810 | ) |  | (2,969 | )
|  | (140,255 | ) |  | (130,965 | )
Net deferred tax liability |  | $ | (95,456 | ) |  | $ | (86,838 | )
Summary of Deferred Tax Assets (Liabilities) by Balance Sheet Classification [Table Text Block] | The deferred tax amounts above have been classified in the accompanying consolidated balance sheets at December 31, 2015 and 2014 as follows:
|  | 2015 |  | 2014
|  | (in thousands)
Current assets, net |  | $ | 16,662 |  |  | $ | 14,767 |
Long-term liabilities, net |  | (112,118 | ) |  | (101,605 | )
|  | $ | (95,456 | ) |  | $ | (86,838 | )
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] | Income tax expense consists of the following:
|  | 2015 |  | 2014 |  | 2013
|  | (in thousands)
Current income taxes: |  |  |  |  |  |
Federal |  | $ | 33,364 |  |  | $ | 6,860 |  |  | $ | 30,560 |
State |  | 2,703 |  |  | 855 |  |  | 1,152 |
|  | 36,067 |  |  | 7,715 |  |  | 31,712 |
Deferred income taxes: |  |  |  |  |  |
Federal |  | 5,170 |  |  | 36,706 |  |  | 7,192 |
State |  | 2,478 |  |  | 2,362 |  |  | 3,070 |
|  | 7,648 |  |  | 39,068 |  |  | 10,262 |
Total |  | $ | 43,715 |  |  | $ | 46,783 |  |  | $ | 41,974 |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] | The income tax provision differs from the amount determined by applying the U.S. federal tax rate as follows:
|  | 2015 |  | 2014 |  | 2013
|  | (in thousands)
Federal tax at statutory rate (35%) |  | $ | 40,870 |  |  | $ | 46,066 |  |  | $ | 39,395 |
State taxes, net of federal benefit |  | 4,022 |  |  | 2,737 |  |  | 3,242 |
Non-taxable interest income |  | (6 | ) |  | (7 | ) |  | (20 | )
Uncertain income tax penalties and interest, net |  | (1,006 | ) |  | (993 | ) |  | (766 | )
Other |  | (165 | ) |  | (1,020 | ) |  | 123 |
|  | $ | 43,715 |  |  | $ | 46,783 |  |  | $ | 41,974 |
Reconciliation of Unrecognized Tax Benefits [Table Text Block] | A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows:
| 2015 |  | 2014
| (in thousands)
Balance at January 1, | $ | 12,632 |  |  | $ | 13,432 |
Additions based on tax positions related to current year | 954 |  |  | 983 |
Additions for tax positions of prior years | — |  |  | 277 |
Reductions for tax positions of prior years | (90 | ) |  | — |
Reductions due to lapse of applicable statute of limitations | (1,927 | ) |  | (2,060 | )
Settlements | — |  |  | — |
Balance at December 31, | $ | 11,569 |  |  | $ | 12,632 |

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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=6907707&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=6907707&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=6907707&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=6907707&loc=d3e32718-109319 + Details
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