Retirement Plans (Schedule of Net Benefit Costs) (Details) (United States Pension Plans of US Entity, Defined Benefit [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
United States Pension Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 8	$ 8	$ 16	$ 15
Interest cost	311	200	621	402
Expected return on plan assets	(338)	(191)	(673)	(383)
Recognized net actuarial loss	56	28	112	56
Net periodic benefit cost	$ 37	$ 45	$ 76	$ 90