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Income Taxes (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Current [Abstract] |  |  |
Federal | $ 12,654 | $ 14,782 | $ 9,272
State | 2,544 | 2,959 | 1,647
Current Total | 15,198 | 17,741 | 10,919
Deferred [Abstract] |  |  |
Federal | (848) | (999) | 1,188
State | (26) | (254) | 95
Deferred Total | (874) | (1,253) | 1,283
Provision for income taxes | 14,324 | 16,488 | 12,202
Effective Income Tax Reconciliation [Abstract] |  |  |
Tax at statutory federal income tax rate | 13,410 | 15,348 | 11,343
Increases (decreases) in tax resulting from: [Abstract] |  |  |
State taxes, net of federal tax benefit | 1,630 | 1,901 | 1,233
Permanent differences, net | (685) | (522) | (221)
Other, net | (31) | (239) | (153)
Provision for income taxes | 14,324 | 16,488 | 12,202
Components of Deferred Tax Assets and Liabilities [Abstract] |  |  |
Current deferred tax assets | 863 | 767 |
Noncurrent deferred tax assets | 2,545 | 2,099 |
Net deferred tax assets | 3,408 | 2,866 |
Gross deferred tax assets [Abstract] |  |  |
Deferred compensation and accrued paid leave | 6,805 | 5,947 |
Accrued expenses | 1,489 | 1,533 |
Stock-based compensation | 510 | 386 |
Interest rate swaps | 125 | 456 |
Reserves for contract disallowances | 326 | 328 |
Acquisition related expenses | 603 | 262 |
Capitalized inventory | 409 | 424 |
Other | 0 | 61 |
Total gross deferred tax assets | 10,267 | 9,397 |
Gross deferred tax liabilities [Abstract] |  |  |
Depreciation | (3,237) | (3,288) |
Deferred revenues | (1,921) | (2,746) |
Intangible assets | (1,701) | (497) |
Gross deferred tax liabilities | (6,859) | (6,531) |
Net deferred tax assets | $ 3,408 | $ 2,866 |

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- Definition Amount of deferred tax liability attributable to taxable temporary differences from intangible assets other than goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 + Details
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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