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Indebtedness (Covenants in the Line of Credit) (Details) (USD $)
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Debt Disclosure [Abstract]      
Consolidated net worth, required $ 800,000,000    
Statutory surplus, required 750,000,000    
Debt-to-capitalization ratio, required 35.00% [1]    
Consolidated net worth, actual 1,153,928,000 1,090,592,000 1,058,328,000
Statutory surplus, actual $ 1,256,400,000 $ 1,050,100,000  
Debt-to-capitalization ratio, actual 25.50% [1]    
[1] Calculated in accordance with Line of Credit agreement.