Goodwill and Intangible Assets (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Goodwill [Roll Forward]
Goodwill beginning balance			$ 87,359,000
Acquisitions			2,518,000
Currency exchange			(547,000)
Goodwill ending balance	89,330,000		89,330,000
FiniteLivedIntangibleAssetsNetAbstract
Gross carrying amount	86,909,000		86,909,000		69,707,000
Accumulated amortization	(30,240,000)		(30,240,000)		(24,161,000)
Currency exchange	(7,217,000)		(7,217,000)		(7,051,000)
Net value	49,452,000		49,452,000		38,495,000
Intangible assets with indefinite lives [Abstract]
Gross carrying amount	6,403,000		6,403,000		6,403,000
Currency exchange	(571,000)		(571,000)		(561,000)
Net value	5,832,000		5,832,000		5,842,000
Total Intangible assets, net	55,284,000		55,284,000		44,337,000
Amortization of Intangible Assets	$ 2,000,000	$ 1,000,000	$ 6,000,000	$ 3,000,000