Retirement Plans (Schedule Of Net Periodic Benefit Costs) (United Kingdom) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
United States Pension Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 8	$ 8
Interest cost	177	187
Expected return on plan assets	(214)	(203)
Recognized net actuarial loss	(53)	(49)
Net periodic benefit cost	24	41
United Kingdom Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	80	83
Expected return on plan assets	(68)	(71)
Amortization of transition amount	(11)	(12)
Recognized net actuarial loss	(53)	(54)
Net periodic benefit cost	$ 54	$ 54