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Long-Term Debt And Notes Payable (Capitalization Of Long-Term Debt) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Debt Disclosure [Abstract]    
Short-term borrowings $ 1,123 $ 1,112
Long-term debt 399,092 398,914
Total indebtedness 400,215  
Total shareholders' equity 918,383 813,553
Capitalization $ 1,318,598  
Total indebtedness to capitalization 0.30