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		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
United States Pension Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 8	$ 8	$ 24	$ 23
Interest cost	187	200	561	600
Expected return on plan assets	(203)	(191)	(607)	(574)
Recognized net actuarial loss	49	28	146	84
Net periodic benefit cost	$ 41	$ 45	$ 124	$ 133