Financial Instruments And Risk Management (Gross Notional Amount Of Outstanding Derivative Instruments) (Details) (Currency Forward Contracts [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Derivative Instruments Designated As Cash Flow Hedges [Member]
Derivative instruments designated as cash flow hedges:
Gross notional amount of outstanding derivative instruments designated as cash flow hedges	$ 72,500	$ 70,000	$ 118,525
Derivative Instruments Not Designated As Cash Flow Hedges [Member]
Derivative instruments not designated as cash flow hedges:
Gross notional amount of outstanding derivative instruments not designated as cash flow hedges	$ 78,968	$ 121,934	$ 104,605

Aggregate notional amount of all derivatives not designated as a hedging instrument. 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_NotionalAmountOfOtherDerivativesNotDesignatedAsHedgingInstruments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant