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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
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