Employee Benefit Plans (Amounts Not Yet Reflected In Net Periodic Benefit Cost And Included In Accumulated Other Comprehensive Income (Loss)) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Prior service cost	$ (119)	$ (168)
Accumulated income (loss)	(85,820)	(78,755)
Accumulated other comprehensive income (loss)	(85,939)	(78,923)	(36,436)
Post-Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated income (loss)	(10,231)	(6,516)
Accumulated other comprehensive income (loss)	$ (10,231)	$ (6,516)	$ (3,692)