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Long-Term Debt Obligations (Details 3) (USD $) | 3 Months Ended | 12 Months Ended |  |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |
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Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Revolving credit facility item | Sep. 23, 2011 Revolving credit facility | Dec. 31, 2012 Revolving credit facility Through December 31, 2013 | Dec. 31, 2012 Revolving credit facility Through June 30, 2014 | Dec. 31, 2012 Revolving credit facility Through maturity | Dec. 31, 2012 Revolving credit facility Actual | Dec. 31, 2012 Revolving credit facility Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: Less than 0.75 | Dec. 31, 2012 Revolving credit facility Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: 0.75 to 1.25 | Dec. 31, 2012 Revolving credit facility Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: 1.25 to 2.00 | Dec. 31, 2012 Revolving credit facility Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA:2.00 to 2.50 | Dec. 31, 2012 Revolving credit facility Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA:2.50 or greater | Dec. 31, 2012 Revolving credit facility Minimum Covenant Requirement | Dec. 31, 2012 Revolving credit facility Maximum | Dec. 31, 2012 Revolving credit facility Maximum Covenant Requirement Through December 31, 2013 | Dec. 31, 2012 Revolving credit facility Maximum Covenant Requirement Through June 30, 2014 | Dec. 31, 2012 Revolving credit facility Maximum Covenant Requirement Through maturity | Dec. 31, 2012 Revolving credit facility Base rate Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: Less than 0.75 | Dec. 31, 2012 Revolving credit facility Base rate Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: 0.75 to 1.25 | Dec. 31, 2012 Revolving credit facility Base rate Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: 1.25 to 2.00 | Dec. 31, 2012 Revolving credit facility Base rate Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA:2.00 to 2.50 | Dec. 31, 2012 Revolving credit facility Base rate Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA:2.50 or greater | Dec. 31, 2012 Revolving credit facility Base rate Federal Funds Rate | Dec. 31, 2012 Revolving credit facility Base rate Wells Fargo Bank, N.A. Prime Rate | Dec. 31, 2012 Revolving credit facility Base rate One-month LIBOR | Dec. 31, 2012 Revolving credit facility Base rate Six-month LIBOR | Dec. 31, 2012 Revolving credit facility Eurodollar rate Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: Less than 0.75 | Dec. 31, 2012 Revolving credit facility Eurodollar rate Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: 0.75 to 1.25 | Dec. 31, 2012 Revolving credit facility Eurodollar rate Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: 1.25 to 2.00 | Dec. 31, 2012 Revolving credit facility Eurodollar rate Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA:2.00 to 2.50 | Dec. 31, 2012 Revolving credit facility Eurodollar rate Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA:2.50 or greater | Dec. 31, 2012 Revolving credit facility Eurodollar rate One-month LIBOR | Dec. 31, 2012 Revolving credit facility Eurodollar rate Six-month LIBOR
Long-Term Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  | $ 125,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit amount outstanding |  |  |  |  |  |  |  |  |  |  |  | 48,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit available |  |  |  |  |  |  |  |  |  |  |  | 76,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Book value of assets pledged as collateral |  |  |  |  |  |  |  |  |  |  |  | 74,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reconciliation of Credit Facility Adjusted EBITDA to net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) including noncontrolling interests | 5,145,000 | 5,325,000 | 4,047,000 | (2,668,000) | 2,085,000 | (36,569,000) | 3,162,000 | (5,170,000) | 11,849,000 | (36,492,000) | 14,740,000 | 11,849,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income taxes - continuing operations |  |  |  |  |  |  |  |  | 10,045,000 | (5,463,000) | 11,193,000 | 10,045,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense, net |  |  |  |  |  |  |  |  |  |  |  | 1,571,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization expense |  |  |  |  |  |  |  |  |  |  |  | 20,630,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock compensation expense |  |  |  |  |  |  |  |  | 2,800,000 | 3,600,000 | 3,700,000 | 2,797,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income taxes - discontinued operation |  |  |  |  |  |  |  |  |  |  |  | 212,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
EBITDA attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  | 275,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-acquisition results of acquired companies, as defined in the credit agreement |  |  |  |  |  |  |  |  |  |  |  | 730,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit Facility Adjusted EBITDA |  |  |  |  |  |  |  |  |  |  |  | 48,109,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal financial covenants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Leverage ratio |  |  |  |  |  |  |  |  |  |  |  | 0.15 |  | 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.00 | 1.50 | 1.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed charge coverage ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 16.31 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Permitted amount of acquisitions per transaction |  |  |  |  |  |  |  |  |  |  |  | 15,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period prior to acquisition for which aggregate purchase price is considered for determining permitted amount of acquisitions per transaction |  |  |  |  |  |  |  |  |  |  |  | 12 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate purchase price of current acquisition and acquisitions in the preceding 12 month period for determining permitted amount of acquisition per transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net leverage ratio used as basis for other restrictions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of interest rate options |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period of Credit Facility Adjusted EBITDA for determining additional margins |  |  |  |  |  |  |  |  |  |  |  | 12 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Market rates relating to interest options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable rate basis |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Base rate | Base rate | Base rate | Base rate | Base rate |  |  | One-month LIBOR | Six-month LIBOR | Eurodollar rate | Eurodollar rate | Eurodollar rate | Eurodollar rate | Eurodollar rate |  |
Interest rate margin (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.75% | 1.00% | 1.25% | 1.50% | 1.75% | 0.50% |  | 1.00% |  | 1.75% | 2.00% | 2.25% | 2.50% | 2.75% |  |
Market rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.67% | 3.25% | 1.21% |  |  |  |  |  |  | 0.21% | 0.51%
Additional per annum interest margin added under: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable rate basis |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Base rate | Base rate | Base rate | Base rate | Base rate |  |  | One-month LIBOR | Six-month LIBOR | Eurodollar rate | Eurodollar rate | Eurodollar rate | Eurodollar rate | Eurodollar rate |  |
Additional per annum interest margin (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.75% | 1.00% | 1.25% | 1.50% | 1.75% | 0.50% |  | 1.00% |  | 1.75% | 2.00% | 2.25% | 2.50% | 2.75% |  |
Letter of credit fees (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.30% | 1.50% | 1.70% | 1.90% | 2.10% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment fees on any portion of the Revolving Loan capacity not in use for borrowings or letters of credit at any given time (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.25% | 0.30% | 0.35% | 0.45% | 0.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 2.30% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing and professional cost |  |  |  |  |  |  |  |  |  |  |  | $ 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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