Pension And Other Postretirement Benefits (Schedule Of Net Periodic Benefit Costs) (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2015	Mar. 31, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Compensation and Retirement Disclosure [Abstract]
Service cost	$ 2,078	$ 2,079	$ 1,807	$ 4,157	$ 3,615
Interest cost	7,408	7,408	7,789	14,816	15,577
Expected return on assets	(11,206)	(11,206)	(10,473)	(22,412)	(20,946)
Amortization of prior service cost	1,217	1,216	1,213	2,433	2,426
Amortization of actuarial loss	3,475	$ 3,475	2,426	6,950	4,855
Net periodic benefit cost	$ 2,972		$ 2,762	$ 5,944	$ 5,527