Pension Plan Components Of Net Periodic Benefit Costs (Details) (Supplemental Employee Retirement Plans, Defined Benefit [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2012 Scenario, Forecast [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 132	$ 135	$ 395	$ 406	$ 526
Amortization of actuarial loss	32	0	96	0	128
Net periodic pension cost	$ 164	$ 135	$ 491	$ 406	$ 654