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Related Party Transactions (Split Dollar Agreements) (Narrative) (Details) - Split Dollar Life Insurance [Member] - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Chief Executive Officer [Member]          
Related Party Transaction [Line Items]          
Payments for life insurance policies $ 0.7   $ 0.7    
Proceeds from life insurance policies, net of premiums paid   $ 0.8   $ 0.8  
Chairman, Board of Directors [Member]          
Related Party Transaction [Line Items]          
Payments for life insurance policies 0.5 $ 0.5 0.5 $ 0.5  
Executive Officers [Member] | Other Long-Term Assets [Member]          
Related Party Transaction [Line Items]          
Life insurance assets, carrying amount $ 12.3   $ 12.3   $ 11.1