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Related Party Transactions (Split Dollar Agreements) (Narrative) (Details) - Split Dollar Life Insurance [Member] - USD ($)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Chief Executive Officer [Member]      
Related Party Transaction [Line Items]      
Proceeds from (payments for) life insurance policies $ 100,000    
Payments for life insurance policies   $ 0 $ 0
Chief Executive Officer [Member] | Maximum [Member]      
Related Party Transaction [Line Items]      
Life insurance, face amount 75,000,000    
Chairman, Board of Directors [Member]      
Related Party Transaction [Line Items]      
Proceeds from (payments for) life insurance policies   (1,200,000)  
Payments for life insurance policies 1,100,000   $ 300,000
Chairman, Board of Directors [Member] | Maximum [Member]      
Related Party Transaction [Line Items]      
Life insurance, face amount 200,000,000    
Executive Officers [Member] | Other Long-Term Assets [Member]      
Related Party Transaction [Line Items]      
Life insurance assets, carrying amount $ 11,100,000 $ 10,200,000