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Investments (Schedule Of Investment In Nonconsolidated affiliates) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Investment, beginning balance       $ 359,687       $ 357,751 $ 359,687 $ 357,751  
Cash advances (repayments) (5,676)       (929)       (5,676) (929)  
Additions (dispositions) of investments, net                 2,704 (6,316)  
Equity in earnings of nonconsolidated affiliates 6,643 3,663 4,696 3,555 13,502 5,210 5,271 2,975 18,557 26,958 5,702
Foreign currency transaction adjustment                 (3,018) (234) (12,783)
Foreign currency translation adjustment                 3,210 (449) 5,916
Distributions received                 (11,716) (16,789)  
Other 470       0       470 0  
Investment, ending balance 370,912       359,687       370,912 359,687 357,751
ARN [Member]
                     
Investment, beginning balance       347,377       342,785 347,377 342,785  
Cash advances (repayments) (8,758)       0       (8,758) 0  
Additions (dispositions) of investments, net                 0 0  
Equity in earnings of nonconsolidated affiliates                 18,621 20,958  
Foreign currency transaction adjustment                 (1,189) (153)  
Foreign currency translation adjustment                 8,085 (1,125)  
Distributions received                 (11,074) (15,088)  
Other 0               0    
Investment, ending balance 353,062       347,377       353,062 347,377  
All Others [Member]
                     
Investment, beginning balance       12,310       14,966 12,310 14,966  
Cash advances (repayments) 3,082       (929)       3,082 (929)  
Additions (dispositions) of investments, net                 2,704 (6,316)  
Equity in earnings of nonconsolidated affiliates                 (64) 6,000  
Foreign currency transaction adjustment                 0 0  
Foreign currency translation adjustment                 (10) 290  
Distributions received                 (642) (1,701)  
Other 470               470    
Investment, ending balance $ 17,850       $ 12,310       $ 17,850 $ 12,310