Defined Benefit Pension Plans Schedule of Net Periodic Pension Benefit Costs (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Schedule of Net Periodic Pension Benefit Costs [Line Items]
Service Cost	$ 676	$ 601	$ 1,414	$ 1,218
Interest Cost	909	969	1,835	1,886
Expected Return on Plan Assets	(82)	(83)	(167)	(163)
Amortization of Actuarial Net Loss (Gains)	2	14	4	28
Amortization of Unrecognized Prior Service Costs	17	19	34	37
Net Periodic Benefit Cost	$ 1,522	$ 1,520	$ 3,120	$ 3,006