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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2015
Income Tax Disclosure [Abstract] |
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] | ## Income before income taxes by geographic area was, for the years ended December 31:
(in thousands) |  | 2015 |  | 2014 |  | 2013
Federal |  | $ | 45,456 |  |  | $ | 57,950 |  |  | $ | 54,872 |
Foreign |  |  | (1,157 | ) |  |  | — |  |  |  | — |
|  | $ | 44,299 |  |  | $ | 57,950 |  |  | $ | 54,872 |
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] | The income tax provision consisted of the following for the years ended December 31:
(in thousands) |  | 2015 |  | 2014 |  | 2013
Current |  |  |  |  |  |  |  |  |  |  |  |
Federal |  | $ | 12,433 |  |  | $ | 14,720 |  |  | $ | 16,812 |
State |  |  | 3,006 |  |  |  | 3,031 |  |  |  | 2,920 |
|  |  | 15,439 |  |  |  | 17,751 |  |  |  | 19,732 |
Deferred |  |  |  |  |  |  |  |  |  |  |  |
Federal |  |  | 1,553 |  |  |  | 3,154 |  |  |  | 218 |
Foreign |  |  | (272 | ) |  |  | — |  |  |  | — |
State |  |  | 277 |  |  |  | 501 |  |  |  | 163 |
|  |  | 1,558 |  |  |  | 3,655 |  |  |  | 381 |
Income tax expense |  | $ | 16,997 |  |  | $ | 21,406 |  |  | $ | 20,113 |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] | The differences between the U.S. federal statutory tax rate and the Company’s effective tax rate for continuing operations were as follows for the years ended December 31:
|  | 2015 |  | 2014 |  | 2013
U.S federal statutory rate |  |  | 35.0 | % |  |  | 35.0 | % |  |  | 35.0 | %
State income taxes, net of U.S. federal income tax expense |  |  | 4.6 |  |  |  | 3.6 |  |  |  | 3.5 |
Provision to return adjustments, net |  |  | 0.5 |  |  |  | 0.2 |  |  |  | (0.3 | )
Tax differential on foreign earnings |  |  | 0.3 |  |  |  | — |  |  |  | — |
Domestic production/manufacturing deduction |  |  | (2.4 | ) |  |  | (2.3 | ) |  |  | (2.0 | )
Non-deductible meals and entertainment |  |  | 0.6 |  |  |  | 0.4 |  |  |  | 0.4 |
Expiration of uncertain tax positions |  |  | (0.4 | ) |  |  | — |  |  |  | — |
Other, net |  |  | 0.2 |  |  |  | — |  |  |  | 0.1 |
Effective rate |  |  | 38.4 | % |  |  | 36.9 | % |  |  | 36.7 | %
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] | The net deferred tax assets and (liabilities) arising from temporary differences was as follows at December 31:
(in thousands) |  | 2015 |  | 2014
Deferred income tax assets: |  |  |  |  |  |  |  |
Self insurance reserves |  | $ | 7,464 |  |  | $ | 8,369 |
Contract loss reserves |  |  | 240 |  |  |  | 72 |
Stock-based awards |  |  | 3,986 |  |  |  | 4,420 |
Bonus |  |  | 2,497 |  |  |  | 2,578 |
Other |  |  | 960 |  |  |  | 886 |
Total deferred income tax assets |  |  | 15,147 |  |  |  | 16,325 |
Deferred income tax liabilities: |  |  |  |  |  |  |  |
Property and equipment – tax over book depreciation |  |  | (25,859 | ) |  |  | (25,350 | )
Intangible assets – tax over book amortization |  |  | (3,670 | ) |  |  | (3,799 | )
Total deferred income tax liabilities |  |  | (29,529 | ) |  |  | (29,149 | )
Net deferred income taxes |  | $ | (14,382 | ) |  | $ | (12,824 | )
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] | The following is a reconciliation of the beginning and ending liability for unrecognized tax benefits at December 31:
(in thousands) |  | 2015 |  | 2014
Balance at beginning of period |  | $ | 507 |  |  | $ | 657 |
Gross increases in current period tax positions |  |  | 62 |  |  |  | 93 |
Gross increases in prior period tax positions |  |  | 19 |  |  |  | — |
Gross decreases in prior period tax positions |  |  | (163 | ) |  |  | (243 | )
Balance at end of period |  |  | 425 |  |  |  | 507 |
Accrued interest and penalties at end of period |  |  | 139 |  |  |  | 223 |
Total liability for unrecognized tax benefits |  | $ | 564 |  |  | $ | 730 |

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