Financial Derivatives and Hedging Activities (Details) (Designated as hedging [Member], Forward foreign currency exchange contracts [Member]) In Thousands, unless otherwise specified	Sep. 30, 2012 Euro / U.S. dollar [Member] EUR (€)	Dec. 31, 2011 Euro / U.S. dollar [Member] EUR (€)	Sep. 30, 2012 U.S. dollar / Canadian dollar [Member] USD ($)	Dec. 31, 2011 U.S. dollar / Canadian dollar [Member] USD ($)
Sell / Buy
Buy Notional	€ 26,994	€ 22,730	$ 11,234	$ 11,019

Aggregate notional amount of foreign currency derivatives to purchase a foreign currency. Notional amount refers to the number of currency units specified in the foreign currency derivative contract.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1A

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579245-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Notional Amount

-URI http://asc.fasb.org/extlink&oid=6519104

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1B

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5580258-113959

Name:	us-gaap_NotionalAmountOfForeignCurrencyDerivativePurchaseContracts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant