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Long-Term Debt Obligations (Details) (USD $) | 3 Months Ended | 9 Months Ended |  | 0 Months Ended | 9 Months Ended |  |  |  |  | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended |
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Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013 | Sep. 30, 2014 Revolving credit facility | Sep. 30, 2014 Revolving credit facility item | Jul. 22, 2014 Revolving credit facility | Jun. 22, 2014 Revolving credit facility | Jun. 21, 2014 Revolving credit facility | Sep. 30, 2014 Revolving credit facility EAS | Sep. 30, 2014 Revolving credit facility Actual | Sep. 30, 2014 Revolving credit facility Minimum | Sep. 30, 2014 Revolving credit facility Minimum Covenant Requirement | Sep. 30, 2014 Revolving credit facility Minimum Actual | Sep. 30, 2014 Revolving credit facility Maximum | Sep. 30, 2014 Revolving credit facility Maximum Through maturity | Sep. 30, 2014 Revolving credit facility Maximum Covenant Requirement | Sep. 30, 2014 Revolving credit facility Maximum Actual | Sep. 30, 2014 Revolving credit facility Base rate Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: Less than 0.75 | Sep. 30, 2014 Revolving credit facility Base rate Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: 0.75 to 1.50 | Sep. 30, 2014 Revolving credit facility Base rate Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: 1.50 to 2.25 | Sep. 30, 2014 Revolving credit facility Base rate Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: 2.25 or greater | Sep. 30, 2014 Revolving credit facility Eurodollar rate Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: Less than 0.75 | Sep. 30, 2014 Revolving credit facility Eurodollar rate Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: 0.75 to 1.50 | Sep. 30, 2014 Revolving credit facility Eurodollar rate Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: 1.50 to 2.25 | Sep. 30, 2014 Revolving credit facility Eurodollar rate Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: 2.25 or greater | Dec. 31, 2013 Notes to former owners
Long-Term Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total |  | $ 42,000,000 |  | $ 2,000,000 |  | $ 42,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,000,000
Less - current portion |  |  |  | (2,000,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total long-term portion of debt |  | 42,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowing capacity |  |  |  |  |  |  |  | 250,000,000 | 175,000,000 | 2,500,000 |  | 250,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding borrowings |  |  |  |  |  | 42,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit amount outstanding |  |  |  |  |  | 50,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit available |  |  |  |  |  | 129,500,000 |  |  |  | 2,500,000 |  |  |  |  | 222,100,000 |  |  |  |  |  |  |  |  |  |  |  |
Number of interest rate options |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional per annum interest margin added under: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments of debt | 3,400,000 | 2,000,000 | 5,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  | 0.68 |  |  |  |  |  |  |  |  |  | 2.75 |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  | 18.15 |  |  | 2.00 |  |  |  |  |  |  |  |  |  |  |  |  |
Permitted amount of acquisitions per transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Aggregate purchase price of current acquisition and acquisitions in the preceding 12 month period for determining permitted amount of acquisition per transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 60,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Net leverage ratio used as basis for other restrictions |  |  |  |  |  |  |  |  |  |  |  |  | 2.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument covenant credit availability ratio |  |  |  |  |  | 2.50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of trailing months used to calculate available credit |  |  |  |  | 12 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing and professional cost |  |  |  |  |  |  | 600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized costs |  |  |  |  |  |  | $ 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Represents the ratio of consolidated adjusted earnings before, interest, taxes, depreciation and amortization, less non-financed capital expenditures, tax provision, dividends and amounts used to repurchase stock to the sum of interest expense and scheduled principal payments of indebtedness required to be maintained under the financial covenants. + References No definition available. + Details
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- Definition Represents the net leverage ratio determine after giving effect to stock repurchases for calculation of the fixed charge coverage ratio under the financial covenants. + References No definition available. + Details
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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). It includes, but is not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References No definition available. + Details
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- Definition The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 + Details
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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 carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + 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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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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