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Derivative Instruments (Financial Information Related To Cash Flow Hedges Of Future Revenues) (Details) In Thousands, unless otherwise specified			12 Months Ended
	Dec. 31, 2011 Euro/US Dollar [Member] EUR (€)	Dec. 31, 2010 Euro/US Dollar [Member] EUR (€)	Dec. 31, 2011 Cash Flow Hedge [Member] USD ($)	Dec. 31, 2010 Cash Flow Hedge [Member] USD ($)	Dec. 31, 2009 Cash Flow Hedge [Member] USD ($)	Dec. 31, 2011 Cash Flow Hedge [Member] Euro/US Dollar [Member] EUR (€)	Dec. 31, 2010 Cash Flow Hedge [Member] Euro/US Dollar [Member] EUR (€)
Derivative [Line Items]
Notional balance of outstanding contracts versus the dollar	€ 36,684	€ 46,307				€ 85,105	€ 73,800
Hedge effectiveness			100.00%	100.00%
Net gains and (losses) included in revenue			$ (4,159)	$ (630)	$ 603

The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

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