Pension Plan (Components Of Pension Costs, U.K. Pension Plan) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Pension Plan
Interest cost	$ 816,000	$ 794,000	$ 2,456,000	$ 2,357,000
Expected return on plan assets	(745,000)	(619,000)	(2,242,000)	(1,837,000)
Amortization of losses	212,000	265,000	639,000	787,000
Net periodic pension cost	283,000	440,000	853,000	1,307,000
Expected contributions to pension plan	$ 3,000,000		$ 3,000,000