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Lines of Credit and Debt (Schedule of Maturities of Long-Term Debt) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Debt Instruments [Abstract]    
2013 $ 948  
2014 396  
2015 648  
2016 0  
2017 0  
thereafter 845,000  
Total long-term debt $ 846,992 $ 447,622