Goodwill and Intangible Assets (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Goodwill [Roll Forward]
Goodwill beginning balance			$ 67,818,000
Acquisitions			7,749,000
Currency exchange			2,171,000
Goodwill ending balance	77,738,000		77,738,000
Intangible assets subject to amortization [Abstract]
Gross carrying amount	63,829,000		63,829,000		48,664,000
Accumulated amortization	(22,439,000)		(22,439,000)		(19,193,000)
Currency exchange	(7,137,000)		(7,137,000)		(7,760,000)
Net value	34,253,000		34,253,000		21,711,000
Intangible assets with indefinite lives [Abstract]
Gross carrying amount	6,403,000		6,403,000		3,162,000
Currency exchange	(578,000)		(578,000)		(676,000)
Net value	5,825,000		5,825,000		2,486,000
Total Intangible assets, net	40,078,000		40,078,000		24,197,000
Amortization expense	$ 1,000,000	$ 1,000,000	$ 3,000,000	$ 3,000,000