Employee Benefit Plans (Pension Plan's Weighted-average Asset Allocations) (Details)	Dec. 31, 2018	Dec. 31, 2017
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	24.60%	12.50%
International Equity [Member]
Defined Benefit Plan, Information about Plan Assets [Abstract]
Weighted average asset allocations	15.50%	15.10%
Fixed Income [Member]
Defined Benefit Plan, Information about Plan Assets [Abstract]
Weighted average asset allocations	57.20%	71.10%
Money Market
Defined Benefit Plan, Information about Plan Assets [Abstract]
Weighted average asset allocations	2.70%	1.30%