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Long-Term Debt Obligations (Details) (USD $) | 3 Months Ended | 9 Months Ended |  | 9 Months Ended |  |  |  | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended | 1 Months Ended |  |  |  |
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Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012 | Sep. 30, 2013 Revolving credit facility item | Jun. 25, 2013 Revolving credit facility | Jun. 24, 2013 Revolving credit facility | Sep. 30, 2013 Revolving credit facility EAS | Sep. 30, 2013 Revolving credit facility Actual | Sep. 30, 2013 Revolving credit facility Minimum | Sep. 30, 2013 Revolving credit facility Minimum Covenant Requirement | Sep. 30, 2013 Revolving credit facility Minimum Actual | Sep. 30, 2013 Revolving credit facility Maximum | Sep. 30, 2013 Revolving credit facility Maximum Through December 31, 2014 | Sep. 30, 2013 Revolving credit facility Maximum Through December 31, 2015 | Sep. 30, 2013 Revolving credit facility Maximum Through maturity | Sep. 30, 2013 Revolving credit facility Maximum Covenant Requirement | Sep. 30, 2013 Revolving credit facility Maximum Actual | Sep. 30, 2013 Revolving credit facility Base rate Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: Less than 0.75 | Sep. 30, 2013 Revolving credit facility Base rate Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: 0.75 to 1.50 | Sep. 30, 2013 Revolving credit facility Base rate Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: 1.50 to 2.25 | Sep. 30, 2013 Revolving credit facility Base rate Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: 2.25 or greater | Sep. 30, 2013 Revolving credit facility Eurodollar rate Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: Less than 0.75 | Sep. 30, 2013 Revolving credit facility Eurodollar rate Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: 0.75 to 1.50 | Sep. 30, 2013 Revolving credit facility Eurodollar rate Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: 1.50 to 2.25 | Sep. 30, 2013 Revolving credit facility Eurodollar rate Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: 2.25 or greater | Jul. 31, 2013 Other debt | Sep. 30, 2013 Other debt | Dec. 31, 2012 Other debt | Sep. 30, 2013 Notes to former owners | Dec. 31, 2012 Notes to former owners
Long-Term Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt | $ 7,000,000 |  | $ 7,000,000 |  | $ 7,400,000 | $ 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,400,000 | $ 2,000,000 | $ 5,000,000
Less - current portion | (2,000,000) |  | (2,000,000) |  | (300,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total long-term portion of debt | 5,000,000 |  | 5,000,000 |  | 7,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowing capacity |  |  |  |  |  |  | 175,000,000 | 125,000,000 | 2,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing and professional cost |  |  |  |  |  |  | 600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized costs |  |  |  |  |  |  | 700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding borrowings |  |  |  |  |  | 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit amount outstanding |  |  |  |  |  | 50,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit available |  |  |  |  |  | 119,300,000 |  |  | 2,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of interest rate options |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional per annum interest margin added under: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable rate basis |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Base rate | Base rate | Base rate | Base rate | Eurodollar rate | Eurodollar rate | Eurodollar rate | Eurodollar rate |  |  |  |  |
Additional per annum interest margin (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.25% | 0.50% | 0.75% | 1.00% | 1.25% | 1.50% | 1.75% | 2.00% |  |  |  |  |
Weighted average interest rate (as a percent) |  |  |  |  |  | 1.40% |  |  | 2.70% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.21% |  | 3.30% |
Payments of debt | 3,400,000 | 300,000 | 5,400,000 | 4,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,400,000 |  |  |  |
Letter of credit fees (as a percent) |  |  |  |  |  |  |  |  |  |  | 1.25% |  |  | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment fees payable on unused portion of the facility (as a percent) |  |  |  |  |  |  |  |  |  |  | 0.20% |  |  | 0.35% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal financial covenants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Leverage ratio |  |  |  |  |  | 0.10 |  |  |  |  |  |  |  |  | 3.00 | 2.75 | 2.50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net leverage ratio used to determine exclusion of stock repurchases and the payment of dividends for calculation of the fixed charge coverage ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.50 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of stock repurchases to maintain maximum net leverage ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Net leverage ratio after giving effect to stock repurchases for calculation of the fixed charge coverage ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.50 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of quarters of capital expenditures, tax provision, dividends and stock repurchase payments used for calculation of fixed charge coverage ratio |  |  |  |  |  | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed charge coverage ratio |  |  |  |  |  |  |  |  |  | 11.14 |  |  | 2.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Permitted amount of acquisitions per transaction |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate purchase price of current acquisition and acquisitions in the preceding 12 month period for determining permitted amount of acquisition per transaction |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net leverage ratio used as basis for other restrictions |  |  |  |  |  |  |  |  |  |  |  | 2.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition For an unclassified balance sheet, the amount as of the balance sheet date of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings over the life of the debt instruments to which such costs pertain. Such amount is before the consideration of accumulated amortization. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28555-108399 + Details
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- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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