Benefit Plans (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Change in benefit obligation
Service costs	$ 69	$ 51	$ 286
Interest costs	856	933	926
Benefits paid	(48)	(2,666)
Unrecognized prior service cost	(2,169)
Settlement (gain) loss		(243)
Actuarial (gain) loss, net	1,161	1,348
Defined Benefit Plan, Benefit Obligation	15,414	15,545	16,122
Amounts recognized in the Consolidated Balance Sheets
Net liabilities included in other liabilities	(12,082)	(10,276)
Amounts recognized in accumulated other comprehensive loss	$ (3,332)	$ (5,269)