Shareholders' Equity (Schedule Of Changes In Equity) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Accumulated Other Comprehensive Loss
Accumulated other comprehensive loss	$ (269,531,000)	$ (456,461,000)	$ (438,436,000)	$ (279,894,000)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	871,000	481,000	(1,331,000)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	0	226,000	(6,000)
Other Comprehensive Income (Loss) Before Reclassifications	174,240,000	(29,763,000)	(164,649,000)
Other Comprehensive Income (Loss), Amounts Reclassified from Accumulated Other Comprehensive Loss	12,690,000	11,738,000	6,107,000
Accumulated Translation Adjustment
Accumulated Other Comprehensive Loss
Accumulated other comprehensive loss	(424,000)	(1,295,000)	(1,776,000)	(445,000)
Other Comprehensive Income (Loss), Amounts Reclassified from Accumulated Other Comprehensive Loss, Foreign Currency Translation Adjustment	0	0	0
Accumulated Net Unrealized Investment Gain (Loss)
Accumulated Other Comprehensive Loss
Accumulated other comprehensive loss	0	0	(226,000)	(220,000)
Other Comprehensive Income (Loss), Amounts Reclassified from Accumulated Other Comprehensive Loss, Available-for-sale Securities	0	0	0
Accumulated Defined Benefit Plans Adjustment
Accumulated Other Comprehensive Loss
Accumulated other comprehensive loss	(269,107,000)	(455,166,000)	(436,434,000)	(279,229,000)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, before Reclassification Adjustments and Tax	173,369,000	(30,470,000)	(163,312,000)
Other Comprehensive Income (Loss), Amounts Reclassified from Accumulated Other Comprehensive Loss, Pension and Other Postretirement Benefit Plans	$ 12,690,000	$ 11,738,000	$ 6,107,000