Employee Benefit Plans Plan Asset Allocation by Asset Category (Details)	Dec. 31, 2015 Rate	Dec. 31, 2014 Rate
Defined Benefit Plan Disclosure [Line Items]
Plan asset allocation by asset category based on fair values	100.00%	100.00%
Cash and cash equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan asset allocation by asset category based on fair values	3.50%	3.40%
Interest bearing deposits in banks [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan asset allocation by asset category based on fair values	0.80%	1.30%
Debt securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan asset allocation by asset category based on fair values	31.20%	28.70%
Marketable equity securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan asset allocation by asset category based on fair values	64.30%	66.40%
Mutual and exchange traded funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan asset allocation by asset category based on fair values	0.20%	0.20%