Nature Of Operations And Significant Accounting Policies (Schedule Of Changes To Intangible Assets) (Details (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Nature Of Operations And Significant Accounting Policies [Abstract]
Balance at beginning of period, net of accumulated amortization	$ 162,636	$ 118,731
Additions, net of disposals	5,980	62,617
Amortization expense	(21,646)	(17,126)	14,100
Currency translation	(743)	(1,586)
Balance at end of period, net of accumulated amortization	$ 146,227	$ 162,636	$ 118,731