Employee Benefit Plans (Pension And Other Postretirement Benefit Costs) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1	$ 5,477	$ 5	$ 11,401
Interest cost	3,695	4,192	7,265	8,556
Expected return on plan assets	(4,467)	(5,879)	(10,231)	(11,857)
Amortization of prior service cost (credit)	0	(53)	0	(107)
Amortization of other actuarial losses (gains)	3,185	532	5,243	1,480
Net benefit cost (credit)	2,414	4,269	2,282	9,473
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	200	440	433	884
Interest cost	308	457	643	921
Amortization of prior service cost (credit)	(2,083)	(2,501)	(4,167)	(5,002)
Amortization of other actuarial losses (gains)	(599)	(210)	(1,055)	(380)
Net benefit cost (credit)	$ (2,174)	$ (1,814)	$ (4,146)	$ (3,577)