Fair Value and Derivative Financial Instruments Fair Value and Derivative Financial Instruments (Notional Amounts) (Details) (Forward Contracts [Member]) In Thousands, unless otherwise specified	Jun. 30, 2012 USD ($)	Jun. 30, 2012 EUR (€)	Dec. 31, 2011 USD ($)	Dec. 31, 2011 EUR (€)
Derivative [Line Items]
Notional amounts of forward contracts	$ 58,320	€ 15,600	$ 50,550	€ 8,250

Aggregate notional amount of all derivatives. The notional amount relates to a number of currency units, shares, bushels, pounds, or other units specified in a derivative instrument.

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Notional Amount

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

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