Employee Benefits (Amounts Recognized in Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Retirement Income Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net loss	$ 118,963	$ 124,407
Prior service benefit	(27,344)	(30,811)
Total	91,619	93,596
Other Pension Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net loss	9,592	11,341
Prior service benefit	(224)	(264)
Total	$ 9,368	$ 11,077