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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2013
Income Taxes |
Schedule of income tax provision from continuing operations |
(in thousands) |  | 2013 |  | 2012 |  | 2011 |
--- | --- | --- | --- | --- | --- | --- | ---
Current |  |  |  |  |  |  |  |  |  |
Federal |  | $ | 16,812 |  | $ | 14,856 |  | $ | 10,047 |
State |  |  | 2,920 |  |  | 2,885 |  |  | 2,038 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
|  |  | 19,732 |  |  | 17,741 |  |  | 12,085 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Deferred |  |  |  |  |  |  |  |  |  |
Federal |  |  | 218 |  |  | 2,396 |  |  | (1,039 | )
State |  |  | 163 |  |  | 291 |  |  | (287 | )
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
|  |  | 381 |  |  | 2,687 |  |  | (1,326 | )
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Income tax expense |  | $ | 20,113 |  | $ | 20,428 |  | $ | 10,759 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
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Schedule of differences between the U.S. federal statutory tax rate and the Company's effective tax rate for continuing operations |
|  | 2013 |  | 2012 |  | 2011 |
--- | --- | --- | --- | --- | --- | --- | ---
U.S federal statutory rate |  |  | 35.0 | % |  | 35.0 | % |  | 35.0 | %
State income taxes, net of U.S. federal income tax expense |  |  | 3.5 |  |  | 3.8 |  |  | 4.5 |
Provision to return adjustments, net |  |  | (0.3 | ) |  | (0.2 | ) |  | (0.3 | )
Deferred tax adjustments, net |  |  | — |  |  | — |  |  | (0.1 | )
Domestic production/manufacturing deduction |  |  | (2.0 | ) |  | (2.0 | ) |  | (2.7 | )
Non-deductible meals and entertainment |  |  | 0.4 |  |  | 0.4 |  |  | 0.7 |
Research and development credit |  |  | — |  |  | (0.1 | ) |  | (0.1 | )
Other, net |  |  | 0.1 |  |  | 0.5 |  |  | — |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
|  |  | 36.7 | % |  | 37.4 | % |  | 37.0 | %
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Schedule of net deferred tax assets and (liabilities) |
(in thousands) |  | 2013 |  | 2012 |
--- | --- | --- | --- | --- | ---
Deferred income tax assets: |  |  |  |  |  |  |
Self insurance reserves |  | $ | 8,643 |  | $ | 9,439 |
Contract loss reserves |  |  | 435 |  |  | 49 |
Stock-based awards |  |  | 4,245 |  |  | 5,099 |
Bonus |  |  | 2,884 |  |  | 1,931 |
Other |  |  | 2,588 |  |  | 1,322 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total deferred income tax assets |  |  | 18,795 |  |  | 17,840 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Deferred income tax liabilities: |  |  |  |  |  |  |
Property and equipment—tax over book depreciation |  |  | (24,037 | ) |  | (22,572 | )
Intangible assets—tax over book amortization |  |  | (3,927 | ) |  | (4,056 | )
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total deferred income tax liabilities |  |  | (27,964 | ) |  | (26,628 | )
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net deferred income taxes |  | $ | (9,169 | ) | $ | (8,788 | )
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Schedule of balance sheet classification of deferred income taxes |
(in thousands) |  | 2013 |  | 2012 |
--- | --- | --- | --- | --- | ---
Current deferred income tax assets |  | $ | 14,550 |  | $ | 12,742 |
Non-current deferred income tax liabilities |  |  | (23,719 | ) |  | (21,530 | )
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
|  | $ | (9,169 | ) | $ | (8,788 | )
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Schedule of reconciliation of the beginning and ending liabilities for unrecognized tax benefits |
(in thousands) |  | 2013 |  | 2012 |
--- | --- | --- | --- | --- | ---
Balance at beginning of period |  | $ | 655 |  | $ | 567 |
Gross increases in current period tax positions |  |  | 132 |  |  | 186 |
Gross increases in prior period tax positions |  |  | 55 |  |  | 134 |
Gross decreases in prior period tax positions |  |  | (185 | ) |  | (232 | )
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at end of period |  |  | 657 |  |  | 655 |
Accrued interest and penalties at end of period |  |  | 189 |  |  | 185 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total liability for unrecognized tax benefits |  | $ | 846 |  | $ | 840 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​

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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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