Benefit Plans (Components of Net Periodic Benefit Cost) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Components of Net Periodic Benefit Cost
Service cost	$ 1,173	$ 821
Interest cost	1,082	935
Net loss	427	127
Net periodic pension cost	$ 2,682	$ 1,883
Weighted Average Assumptions for Expense
Discount Rate	4.75%	4.35%
Rate of Compensation Increase	4.40%	4.34%