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Debt (Details 2) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Debt      
Total $ 287,148 $ 41,642  
Current maturities of long term debt 17,800 17,076  
Long-term debt 269,348 24,566  
Aggregate annual maturities of debt      
2012 17,800    
2013 20,716    
2014 19,835    
2015 18,109    
2016 210,688    
Total 287,148 41,642  
Interest income, expense and other financing costs      
Interest income 788 714 1,216
Interest expense and other financing costs (16,613) (5,459) (4,879)
Total interest income, expense and other financing costs (15,825) (4,745) (3,663)
Term Loan Facility
      
Debt      
Total 250,000    
Aggregate annual maturities of debt      
Total 250,000    
Acquisition promissory notes
      
Debt      
Total 30,554 34,575  
Aggregate annual maturities of debt      
Total 30,554 34,575  
Acquisition promissory notes | Minimum
      
Debt      
Interest rate (as a percent) 1.30%    
Acquisition promissory notes | Maximum
      
Debt      
Interest rate (as a percent) 6.00%    
Loans payable to noncontrolling shareholders of a consolidated subsidiary
      
Debt      
Total 2,795 3,146  
Aggregate annual maturities of debt      
Total 2,795 3,146  
Loans payable to noncontrolling shareholders of a consolidated subsidiary | Minimum
      
Debt      
Interest rate (as a percent) 6.00%    
Loans payable to noncontrolling shareholders of a consolidated subsidiary | Maximum
      
Debt      
Interest rate (as a percent) 12.10%    
Capital leases
      
Debt      
Total 3,377 2,994  
Aggregate annual maturities of debt      
Total 3,377 2,994  
Other
      
Debt      
Total 422 927  
Aggregate annual maturities of debt      
Total $ 422 $ 927