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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2014
Income Tax Disclosure [Abstract] |
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) |  | 2014 |  | 2013 |  | 2012
Current |  |  |  |  |  |  |  |  |  |  |  |
Federal |  | $ | 14,720 |  |  | $ | 16,812 |  |  | $ | 14,856 |
State |  |  | 3,031 |  |  |  | 2,920 |  |  |  | 2,885 |
|  |  | 17,751 |  |  |  | 19,732 |  |  |  | 17,741 |
Deferred |  |  |  |  |  |  |  |  |  |  |  |
Federal |  |  | 3,154 |  |  |  | 218 |  |  |  | 2,396 |
State |  |  | 501 |  |  |  | 163 |  |  |  | 291 |
|  |  | 3,655 |  |  |  | 381 |  |  |  | 2,687 |
Income tax expense |  | $ | 21,406 |  |  | $ | 20,113 |  |  | $ | 20,428 |
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:
|  | 2014 |  | 2013 |  | 2012
U.S federal statutory rate |  |  | 35.0 % |  |  |  | 35.0 % |  |  |  | 35.0 % |
State income taxes, net of U.S. federal income tax expense |  |  | 3.6 |  |  |  | 3.5 |  |  |  | 3.8 |
Provision to return adjustments, net |  |  | 0.2 |  |  |  | (0.3 | ) |  |  | (0.2 | )
Domestic production/manufacturing deduction |  |  | (2.3 | ) |  |  | (2.0 | ) |  |  | (2.0 | )
Non-deductible meals and entertainment |  |  | 0.4 |  |  |  | 0.4 |  |  |  | 0.4 |
Research and development credit |  |  | — |  |  |  | — |  |  |  | (0.1 | )
Other, net |  |  | — |  |  |  | 0.1 |  |  |  | 0.5 |
Effective rate |  |  | 36.9 % |  |  |  | 36.7 % |  |  |  | 37.4 % |
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) |  | 2014 |  | 2013
Deferred income tax assets: |  |  |  |  |  |  |  |
Self insurance reserves |  | $ | 8,369 |  |  | $ | 8,643 |
Contract loss reserves |  |  | 72 |  |  |  | 435 |
Stock-based awards |  |  | 4,420 |  |  |  | 4,245 |
Bonus |  |  | 2,578 |  |  |  | 2,884 |
Other |  |  | 886 |  |  |  | 2,588 |
Total deferred income tax assets |  |  | 16,325 |  |  |  | 18,795 |
Deferred income tax liabilities: |  |  |  |  |  |  |  |
Property and equipment – tax over book depreciation |  |  | (25,350 | ) |  |  | (24,037 | )
Intangible assets – tax over book amortization |  |  | (3,799 | ) |  |  | (3,927 | )
Total deferred income tax liabilities |  |  | (29,149 | ) |  |  | (27,964 | )
Net deferred income taxes |  | $ | (12,824 | ) |  | $ | (9,169 | )
Schedule Of Deferred Tax Assets And Liabilities Balance Sheet Classification [Table Text Block] | The balance sheet classification of deferred income taxes is as follows:
(in thousands) |  | 2014 |  | 2013
Current deferred income tax assets |  | $ | 11,905 |  |  | $ | 14,550 |
Non-current deferred income tax liabilities |  |  | (24,729 | ) |  |  | (23,719 | )
|  | $ | (12,824 | ) |  | $ | (9,169 | )
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) |  | 2014 |  | 2013
Balance at beginning of period |  | $ | 657 |  |  | $ | 655 |
Gross increases in current period tax positions |  |  | 93 |  |  |  | 132 |
Gross increases in prior period tax positions |  |  | — |  |  |  | 55 |
Gross decreases in prior period tax positions |  |  | (243 | ) |  |  | (185 | )
Balance at end of period |  |  | 507 |  |  |  | 657 |
Accrued interest and penalties at end of period |  |  | 223 |  |  |  | 189 |
Total liability for unrecognized tax benefits |  | $ | 730 |  |  | $ | 846 |

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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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