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Employee Benefit Plans (Schedule of Weighted Average Asset Allocation) (Details)
Dec. 31, 2016
Dec. 31, 2015
Asset Allocations 100.00% 100.00%
Equity Securities [Member]    
Asset Allocations 61.00% 60.00%
Cash and Cash Equivalents [Member]    
Asset Allocations 2.00% 1.00%
Debt Securities [Member]    
Asset Allocations 37.00% 39.00%