Defined Benefit Pension Plans Schedule of Net Periodic Pension Benefit Costs (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
Schedule of Net Periodic Pension Benefit Costs [Line Items]
Service Cost	$ 655	$ 637	$ 2,069	$ 1,855
Interest Cost	887	947	2,722	2,833
Expected Return on Plan Assets	(80)	(80)	(247)	(243)
Amortization of Actuarial Net Loss (Gains)	1	14	5	42
Amortization of Unrecognized Prior Service Costs	16	18	50	55
defined benefit plan, settlements and termination benefits	97	0	97	0
Net Periodic Benefit Cost	$ 1,576	$ 1,536	$ 4,696	$ 4,542