Benefit Plans (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Components of net periodic benefit cost/(gain)
Service cost
Interest cost	(95)	54	186
Expected return on plan assets
Net amortization of prior service cost	(78)	(78)	(1)
Amortization of net actuarial gain	(23)	(690)
Net periodic benefit cost	(95)	54	185
Net loss (gain)	193	(79)	(671)
Prior service credit	193	(689)
Amortization of prior service cost	(170)	78	1
Total recognized in other comprehensive income	23	(690)	(670)
Total recognized in net periodic benefit cost and other comprehensive income	$ (72)	$ (636)	$ (485)
Assumptions used in the valuations were as follows:
Weighted average discount rate	3.00%	4.00%	5.00%