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Long-Term Debt (Narrative) (Details) (USD $)
 0 Months Ended 3 Months Ended 6 Months Ended 0 Months Ended 0 Months Ended 6 Months Ended
Apr. 14, 2014
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
YTD [Member]
Apr. 14, 2014
Term Number One [Member]
Apr. 14, 2014
Term Number Two [Member]
Jun. 30, 2014
Term Number Two [Member]
Apr. 14, 2014
Term Number Three [Member]
Jun. 30, 2014
Minimum [Member]
Jun. 30, 2014
Maximum [Member]
Jun. 30, 2014
Prime Rate [Member]
Jun. 30, 2014
Libor [Member]
Jun. 30, 2014
Ratio Maximum Per Covenant [Member]
Apr. 14, 2014
Ratio Maximum Per Covenant [Member]
Jun. 30, 2014
Ratio Minimum Per Covenant [Member]
Jun. 30, 2014
Ratio Actual [Member]
Jun. 30, 2014
Revolving Credit Facility [Member]
Apr. 14, 2014
Revolving Credit Facility [Member]
Apr. 13, 2014
Revolving Credit Facility [Member]
Jun. 30, 2014
Revolving Credit Facility [Member]
QTD [Member]
Feb. 27, 2014
Revolving Credit Facility [Member]
Senior Unsecured Debt [Member]
Jun. 30, 2014
Term Loan
Debt Covenant To Actual Ratios [Line Items]                                                
Revolving credit facility, maximum borrowing capacity   $ 325,000,000   $ 325,000,000                             $ 200,000,000 $ 200,000,000 $ 125,000,000   $ 150,000,000 $ 125,000,000
Term loan facility 125,000,000                                              
Revolving credit facility present accordion provisions   50,000,000   50,000,000                                        
Credit facility maturity date (Date)       Mar. 31, 2019                                        
Amount drawn under term loan facility                                     42,400,000         125,000,000
Description of variable interest rate                         prime rate LIBOR                    
Weighted average interest rate           2.80%                               3.00%    
(Decrease) in variable interest rate of debt instrument   0.50%                                            
Assets and operations independent of subsidiaries   0   0                                        
Ratio of indebtedness to net capital (in Ratio)               3.50 3.5           3.75 3.75   2.87            
Gains Losses On Extinguishment Of Debt And Other Costs   $ 1,042,000 $ 0 $ 1,042,000 $ 0                                      
Ratio of earnings to fixed cost obligations (in Ratio)                                 1.2 2.50            
Deferred purchase price notes payable to sellers of acquired entities, discounted imputed interest rate (in Percent)                     7.00% 11.00%                        
Deferred purchase price note interest rate   0.00%   0.00%                                        
Imputed interest rate                     9.50% 11.00%                        
Deferred purchase price notes payable to sellers of acquired entities, range of original maturities (in years)                     5 years 20 years                        
Debt Instrument, Periodic Principal Repayment, Percentage             7.50% 10.00%   12.50%                            
Debt Instrument, Periodic Principal Payments, Term 2 years