Goodwill and Intangible Assets (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Goodwill [Roll Forward]
Goodwill beginning balance			$ 87,359,000
Acquisitions			2,192,000
Currency exchange			(3,318,000)
Goodwill ending balance	86,233,000		86,233,000
FiniteLivedIntangibleAssetsNetAbstract
Gross carrying amount	86,909,000		86,909,000		69,707,000
Accumulated amortization	(28,369,000)		(28,369,000)		(24,161,000)
Currency exchange	(7,889,000)		(7,889,000)		(7,051,000)
Net value	50,651,000		50,651,000		38,495,000
Intangible assets with indefinite lives [Abstract]
Gross carrying amount	6,403,000		6,403,000		6,403,000
Currency exchange	(735,000)		(735,000)		(561,000)
Net value	5,668,000		5,668,000		5,842,000
Total Intangible assets, net	56,319,000		56,319,000		44,337,000
Amortization of Intangible Assets	$ 2,000,000	$ 1,000,000	$ 4,000,000	$ 2,000,000