Employee Benefit Plans (Defined Benefit Pension Plans Recognized As A Component Of Other Comprehensive Income) (Details) (Defined Benefit Pension Plans Recognized As Component Of Other Comprehensive Income [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Defined Benefit Pension Plans Recognized As Component Of Other Comprehensive Income [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial gain (loss)	$ (22,463)	$ (702)	$ 12,388
Deferred tax (expense) benefit	7,862	245	(4,335)
Other comprehensive income (loss), net of tax	$ (14,601)	$ (457)	$ 8,053