Financial Instruments And Risk Management (Gross Notional Amount Of Outstanding Derivative Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Derivative Instruments Designated As Cash Flow Hedges [Member] | Currency Forward Contracts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Currency forward contracts	$ 106,500	$ 103,000	$ 142,500
Derivative Instruments Designated As Cash Flow Hedges [Member] | Foreign Exchange Option [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Currency forward contracts	7,000	0	0
Derivative Instruments Not Designated As Cash Flow Hedges [Member] | Currency Forward Contracts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Currency forward contracts	$ 75,000	$ 128,000	$ 36,000