Financial Instruments And Risk Management (Balance Sheet Classification And Fair Value Of Derivative Instruments) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015
Prepaid Expenses And Other Current Assets [Member] \| Derivative Instruments Designated As Cash Flow Hedges [Member] \| Currency Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	$ 409	$ 5,394	$ 14,475
Prepaid Expenses And Other Current Assets [Member] \| Derivative Instruments Designated As Cash Flow Hedges [Member] \| Foreign Exchange Option [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	0	0	132
Prepaid Expenses And Other Current Assets [Member] \| Derivative Instruments Not Designated As Cash Flow Hedges [Member] \| Currency Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	7	1,328	1,180
Other Non-Current Assets [Member] \| Derivative Instruments Designated As Cash Flow Hedges [Member] \| Currency Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative assets	63	566	0
Accrued Liabilities [Member] \| Derivative Instruments Designated As Cash Flow Hedges [Member] \| Currency Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative liabilities	3,524	224	0
Accrued Liabilities [Member] \| Derivative Instruments Not Designated As Cash Flow Hedges [Member] \| Currency Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative liabilities	727	1,693	123
Other Long Term Liabilities [Member] \| Derivative Instruments Designated As Cash Flow Hedges [Member] \| Currency Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative liabilities	$ 922	$ 0	$ 0

Aggregate fair value of all derivative assets designated as hedging instruments. Includes instruments designated as cash flow hedges, fair value hedges, and hedges of net investments in foreign operations.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611

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Aggregate fair value of all derivative liabilities designated as hedging instruments. Includes instruments designated as cash flow hedges, fair value hedges, and hedges of net investments in foreign operations.

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