Employee Benefit Plans And Other Postretirement Benefits (Schedule Of-Weighted Average Health Care Cost Trend Rate Assumption) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]
Defined Benefit Plan, Year that Rate Reaches Ultimate Trend Rate	2021	2021
Defined Benefit Plan, Effect of One-Percentage Point Change in Assumed Health Care Cost Trend Rates [Abstract]
Total of service and interest cost components in 2012, One Percent Increase	$ 755
Total of service and interest cost components in 2012, One Percent Decrease	(605)
Accumulated benefit obligation as of December 31, 2012, One Percent Increase	12,211
Accumulated benefit obligation as of December 31, 2012, One Percent Decrease	$ (10,875)