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Indebtedness (Schedule Of Aggregate Maturities Of The Company's Indebtedness) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Indebtedness [Abstract]    
Remainder of 2012 $ 99,000  
2013 186,606  
2014 3,961  
2015 124,205  
2016 9,342 [1]  
Thereafter 516,149  
Total long-term debt 939,263 970,443
Line of credit, outstanding balance $ 4,923  
[1] Includes outstanding balances on lines of credit totaling $4,923.