Pension Plans And Other Postretirement Benefit Plans (Components Of Net Periodic Benefit Cost) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), after Tax	$ (6,650)	$ (7,888)
Pension Plan And SERP [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), after Tax	6,527	7,820
Service cost	19,791	15,757	$ 19,045
Interest cost	26,117	26,224	23,896
Expected return on plan assets	(28,299)	(32,131)	(27,671)
Amortization of prior service cost	2	22	319
Net loss recognition	9,451	4,731	13,199
Net periodic benefit cost	27,062	14,603	28,788
Other Post-Retirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), after Tax	123	68
Service cost	2,925	1,844	4,144
Interest cost	5,158	5,226	5,216
Expected return on plan assets	(1,991)	(1,903)	(1,606)
Amortization of prior service cost	(1,199)	(1,116)	(149)
Net loss recognition	5,095	4,289	5,674
Net periodic benefit cost	$ 9,988	$ 8,340	$ 13,279