Goodwill and Intangible Assets (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Goodwill [Roll Forward]
Goodwill beginning balance	$ 87,359,000
Acquisitions	2,192,000
Currency exchange	(3,151,000)
Goodwill ending balance	86,400,000
FiniteLivedIntangibleAssetsNetAbstract
Gross carrying amount	86,909,000		69,707,000
Accumulated amortization	(26,072,000)		(24,161,000)
Currency exchange	(7,885,000)		(7,051,000)
Net value	52,952,000		38,495,000
Intangible assets with indefinite lives [Abstract]
Gross carrying amount	6,403,000		6,403,000
Currency exchange	(732,000)		(561,000)
Net value	5,671,000		5,842,000
Total Intangible assets, net	58,623,000		44,337,000
Amortization of Intangible Assets	$ 2,000,000	$ 1,000,000