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Debt (Details 2) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Debt      
Total debt $ 463,711 $ 380,318  
Current maturities of long-term debt 14,647 26,065  
Long term-debt 449,064 354,253  
Weighted average interest rate (as a percent) 2.10% 2.40%  
Aggregate annual maturities of debt      
2014 14,647    
2015 9,733    
2016 12,508    
2017 16,016    
2018 410,807    
Interest income, expense and other financing costs      
Interest income 3,882 908 788
Interest expense and other financing costs (21,169) (20,005) (16,613)
Interest expense and other financing costs, net (17,287) (19,097) (15,825)
Credit facility
      
Debt      
Total debt 200,000 100,500  
Term Loans
      
Debt      
Total debt 242,500 247,500  
Acquisition promissory notes
      
Debt      
Total debt 13,403 25,878  
Interest rate, minimum (as a percent) 1.20%    
Interest rate, maximum (as a percent) 6.00%    
Other
      
Debt      
Total debt $ 7,808 $ 6,440  
Interest rate, minimum (as a percent) 2.00%    
Interest rate, maximum (as a percent) 6.30%