Hedging Activities And Financial Instruments (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Nov. 30, 2011
Derivative Instruments, Gain (Loss) [Line Items]
Foreign currency derivative contracts	$ 0	$ 0
Foreign currency gain (loss)	(5,727,000)	(773,000)	145,000
Interest rate	5.50%
Senior Convertible Notes Due December 15, 2016 [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Debt maturity date	Dec. 15, 2016
Interest rate	5.50%
Principal amount of convertible notes				$ 152,000,000