Financial Instruments (Derivative Instruments Notional Amount Outstanding) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Forward Currency Contracts [Member]
Derivatives, Fair Value [Line Items]
Notional amount of derivative	$ 147,078	$ 104,108
Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Notional amount of derivative	$ 100,000	$ 122,274

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