Pension Plan (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Pension Plan Details
Current service cost, net of employee contributions	$ 9	$ 4	$ 30	$ 21
Interest cost on accrued benefit obligation	36	37	106	111
Expected return on plan assets	(39)	(39)	(117)	(117)
Amortization of transitional obligation	3	3	10	10
Amortization of past service costs	2	2	7	7
Amortization of net actuarial gain	13	9	37	24
Total cost of benefit	$ 24	$ 16	$ 73	$ 56