Intangible Assets (Schedule Of Goodwill And Net Carrying Amount Of Intangible Assets With Indefinite Lives) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Indefinite-lived Intangible Assets by Segment [Line Items]
Goodwill gross, beginning balance	$ 454,494us-gaap_GoodwillGross	$ 335,699us-gaap_GoodwillGross
Accumulated impairment loss, beginning balance	(50,003)	(50,003)
Goodwill net, beginning balance	404,491us-gaap_Goodwill	285,696us-gaap_Goodwill
Acquisitions	124,393us-gaap_GoodwillAcquiredDuringPeriod	111,245us-gaap_GoodwillAcquiredDuringPeriod
Purchase price adjustments	(9,272)	170
Foreign currency translation adjustments	(7,649)us-gaap_GoodwillTranslationAdjustments	7,380us-gaap_GoodwillTranslationAdjustments
Goodwill gross, ending balance	561,966us-gaap_GoodwillGross	454,494us-gaap_GoodwillGross
Accumulated impairment loss, ending balance	(50,003)	(50,003)
Goodwill net, ending balance	511,963us-gaap_Goodwill	404,491us-gaap_Goodwill
Trade Name [Member]
Indefinite-lived Intangible Assets by Segment [Line Items]
Indefinite lived intangible asset, Beginning balance	760	3,431
Acquisitions		513
Indefinite-lived Intangible Assets Reclassification to Definite-lived		(3,298)
Indefinite lived intangible asset, foreign currency translation adjustments	(32)	114
Indefinite lived intangible asset, Ending balance	728	760
U.S. [Member]
Indefinite-lived Intangible Assets by Segment [Line Items]
Goodwill gross, beginning balance	288,439	268,454
Goodwill net, beginning balance	288,439	268,454
Acquisitions	108,932	13,316
Purchase price adjustments	(1,493)	29
Allocation adjustment		6,640
Goodwill gross, ending balance	395,878	288,439
Goodwill net, ending balance	395,878	288,439
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, Ending balance	200	200	200
Europe [Member]
Indefinite-lived Intangible Assets by Segment [Line Items]
Goodwill gross, beginning balance	162,763	64,142
Accumulated impairment loss, beginning balance	(50,003)	(50,003)
Goodwill net, beginning balance	112,760	14,139
Acquisitions	15,461	97,929
Purchase price adjustments	(7,779)
Allocation adjustment		(6,860)
Foreign currency translation adjustments	(7,456)	7,552
Goodwill gross, ending balance	162,989	162,763
Accumulated impairment loss, ending balance	(50,003)	(50,003)
Goodwill net, ending balance	112,986	112,760
Europe [Member] \| Trade Name [Member]
Indefinite-lived Intangible Assets by Segment [Line Items]
Indefinite lived intangible asset, Beginning balance	560	3,231
Acquisitions		513
Indefinite-lived Intangible Assets Reclassification to Definite-lived		(3,298)
Indefinite lived intangible asset, foreign currency translation adjustments	(32)	114
Indefinite lived intangible asset, Ending balance	528	560
Other International [Member]
Indefinite-lived Intangible Assets by Segment [Line Items]
Goodwill gross, beginning balance	3,292	3,103
Goodwill net, beginning balance	3,292	3,103
Purchase price adjustments		141
Allocation adjustment		220
Foreign currency translation adjustments	(193)	(172)
Goodwill gross, ending balance	3,099	3,292
Goodwill net, ending balance	$ 3,099	$ 3,292

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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