Employee Benefit Plans (Pension Plan's Weighted-average Asset Allocations) (Details)	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan, Information about Plan Assets [Abstract]
Weighted average asset allocations	100.00%	100.00%
U.S. Equity [Member]
Defined Benefit Plan, Information about Plan Assets [Abstract]
Weighted average asset allocations	27.10%	28.30%
International Equity [Member]
Defined Benefit Plan, Information about Plan Assets [Abstract]
Weighted average asset allocations	17.70%	17.10%
Fixed Income [Member]
Defined Benefit Plan, Information about Plan Assets [Abstract]
Weighted average asset allocations	53.80%	52.60%
Money Market
Defined Benefit Plan, Information about Plan Assets [Abstract]
Weighted average asset allocations	1.40%	2.00%