Intangible Assets (Schedule Of Goodwill And Net Carrying Amount Of Intangible Assets With Indefinite Lives) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Indefinite-lived Intangible Assets by Segment [Line Items]
Goodwill gross, beginning balance	$ 335,699
Accumulated impairment loss, beginning balance	(50,003)
Goodwill net, beginning balance	285,696
Acquisition	7,997
Purchase price adjustment	204
Foreign currency translation adjustments	(855)
Goodwill gross, ending balance	343,045
Accumulated impairment loss, ending balance	(50,003)
Goodwill net, ending balance	293,042
Trade Name [Member]
Indefinite-lived Intangible Assets by Segment [Line Items]
Indefinite lived intangible asset, Beginning balance	3,431
Acquisitions	453
Indefinite lived intangible asset, foreign currency translation adjustments	(191)
Indefinite lived intangible asset, Ending balance	3,693
U.S. [Member]
Indefinite-lived Intangible Assets by Segment [Line Items]
Goodwill gross, beginning balance	268,454
Accumulated impairment loss, beginning balance
Goodwill net, beginning balance	268,454
Acquisition
Purchase price adjustment
Foreign currency translation adjustments
Goodwill gross, ending balance	268,454
Accumulated impairment loss, ending balance
Goodwill net, ending balance	268,454
U.S. [Member] | Trade Name [Member]
Indefinite-lived Intangible Assets by Segment [Line Items]
Indefinite lived intangible asset, Beginning balance	200
Indefinite lived intangible asset, foreign currency translation adjustments
Indefinite lived intangible asset, Ending balance	200
U.K. [Member]
Indefinite-lived Intangible Assets by Segment [Line Items]
Goodwill gross, beginning balance	64,142
Accumulated impairment loss, beginning balance	(50,003)
Goodwill net, beginning balance	14,139
Acquisition	7,997
Foreign currency translation adjustments	(795)
Goodwill gross, ending balance	71,344
Accumulated impairment loss, ending balance	(50,003)
Goodwill net, ending balance	21,341
U.K. [Member] | Trade Name [Member]
Indefinite-lived Intangible Assets by Segment [Line Items]
Indefinite lived intangible asset, Beginning balance	3,231
Acquisitions	453
Indefinite lived intangible asset, foreign currency translation adjustments	(191)
Indefinite lived intangible asset, Ending balance	3,493
Other International [Member]
Indefinite-lived Intangible Assets by Segment [Line Items]
Goodwill gross, beginning balance	3,103	[1]
Goodwill net, beginning balance	3,103	[1]
Purchase price adjustment	204	[1]
Foreign currency translation adjustments	(60)	[1]
Goodwill gross, ending balance	3,247	[1]
Goodwill net, ending balance	$ 3,247	[1]

[1] The Other International segment is currently comprised of the Company’s operations in Mexico and Canada.