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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2012
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:
|  | 2012 |  | 2011
|  | (in thousands)
Deferred income tax assets: |  |  |  |
Allowance for doubtful accounts |  | $ | 305 |  |  | $ | 288 |
Accrued expenses |  | 6,655 |  |  | 6,513 |
Stock-based compensation |  | 579 |  |  | 46 |
Insurance accruals |  | 27,549 |  |  | 27,677 |
Unrealized loss on available-for-sale investments |  | 449 |  |  | 1,078 |
Indirect tax benefits of unrecognized tax benefits |  | 5,658 |  |  | 5,767 |
Other |  | 1,011 |  |  | 1,230 |
Total gross deferred tax assets |  | 42,206 |  |  | 42,599 |
Less valuation allowance |  | (449 | ) |  | (1,078 | )
Net deferred tax assets |  | 41,757 |  |  | 41,521 |
Deferred income tax liabilities: |  |  |  |  |
Property and equipment |  | (77,177 | ) |  | (82,897 | )
Goodwill |  | (1,351 | ) |  | (1,195 | )
Prepaid expenses |  | (738 | ) |  | (689 | )
|  | (79,266 | ) |  | (84,781 | )
Net deferred tax liability |  | $ | (37,509 | ) |  | $ | (43,260 | )
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, 2012 and 2011 as follows:
|  | 2012 |  | 2011
|  | (in thousands)
Current assets, net |  | $ | 13,797 |  |  | $ | 14,401 |
Noncurrent liabilities, net |  | (51,306 | ) |  | (57,661 | )
|  | $ | (37,509 | ) |  | $ | (43,260 | )
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] | Income tax expense consists of the following:
|  | 2012 |  | 2011 |  | 2010
|  | (in thousands)
Current income taxes: |  |  |  |  |  |
Federal |  | $ | 38,148 |  |  | $ | 20,460 |  |  | $ | 40,165 |
State |  | 1,636 |  |  | 2,195 |  |  | (1,068 | )
|  | 39,784 |  |  | 22,655 |  |  | 39,097 |
Deferred income taxes: |  |  |  |  |  |
Federal |  | (5,890 | ) |  | 16,587 |  |  | (7,804 | )
State |  | 140 |  |  | (1,844 | ) |  | (636 | )
|  | (5,750 | ) |  | 14,743 |  |  | (8,440 | )
Total |  | $ | 34,034 |  |  | $ | 37,398 |  |  | $ | 30,657 |
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:
|  | 2012 |  | 2011 |  | 2010
|  | (in thousands)
Federal tax at statutory rate (35%) |  | $ | 33,451 |  |  | $ | 37,565 |  |  | $ | 32,506 |
State taxes, net of federal benefit |  | 1,554 |  |  | 981 |  |  | (213 | )
Non-taxable interest income |  | (48 | ) |  | (104 | ) |  | (243 | )
Uncertain income tax penalties and interest, net |  | (616 | ) |  | (1,159 | ) |  | (1,377 | )
Other |  | (307 | ) |  | 115 |  |  | (16 | )
|  | $ | 34,034 |  |  | $ | 37,398 |  |  | $ | 30,657 |
Reconciliation of Unrecognized Tax Benefits [Table Text Block] | A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows:
| 2012 |  | 2011
| (in thousands)
Balance at January 1, | $ | 16,062 |  |  | $ | 18,140 |
Additions based on tax positions related to current year | 1,146 |  |  | 1,200 |
Additions for tax positions of prior years | 1,075 |  |  | — |
Reductions for tax positions of prior years | (134 | ) |  | — |
Reductions due to lapse of applicable statute of limitations | (2,426 | ) |  | (3,278 | )
Settlements | — |  |  | — |
Balance at December 31, | $ | 15,723 |  |  | $ | 16,062 |

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