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Financial Derivatives and Hedging Activities (Details) (Designated as hedging [Member], Forward foreign currency exchange contracts [Member]) In Thousands, unless otherwise specified | Mar. 31, 2013 Euro / U.S. dollar [Member] EUR (€) | Dec. 31, 2012 Euro / U.S. dollar [Member] EUR (€) | Mar. 31, 2013 U.S. dollar / Canadian dollar [Member] USD ($) | Dec. 31, 2012 U.S. dollar / Canadian dollar [Member] USD ($)
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Sell / Buy |  |  |  |
Buy Notional | € 25,929 | € 27,003 | $ 12,528 | $ 12,369

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- Definition 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. + References 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 + Details
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