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Long-Term Debt Maturities (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Debt Instrument [Line Items]    
2012 $ 62,320  
2013 28,300  
2014 50,026  
2015 52,500  
2016 257,295  
Thereafter 459,645  
Total 910,086 [1]  
Long-term Debt 908,295 720,889
Acquisition Notes [Member] | Non Interest Bearing Acquisition Note [Member]
   
Debt Instrument [Line Items]    
Long-term Debt $ 13,209 $ 0
[1] Includes the acquisition related note payable of $15.0 million, which is non-interest and discounted to $13.2 million as of December 31, 2011.