Pension Plan And Other Postretirement Benefits (Net Periodic Pension And Other Postretirement Benefit Costs) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 3,323	$ 3,447
Interest cost	1,284	1,026
Expected return on plan assets	(1,788)	(1,534)
Amortization of prior service cost	26	26
Amortization of net loss	89	385
Net periodic benefit cost	2,934	3,350
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	619	574
Interest cost	160	110
Amortization of prior service cost	4	4
Amortization of net loss	16	30
Net periodic benefit cost	$ 799	$ 718