Shareholders' Equity (Components Of Accumulated Other Comprehensive Loss) (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Stockholders' Equity Note [Abstract]
Cumulative foreign currency translation adjustment	$ (15,667,000)	$ (22,958,000)
Unrealized gain (loss) on hedges, net		12,941,000	[1]
Accumulated other comprehensive loss	(15,667,000)	(10,017,000)
Deferred Tax Assets, Other Comprehensive Loss		$ 7,000,000

[1] Amount at December 31, 2011 is net of deferred income tax liabilities totaling $7.0 million. In December 2012, all of our oil and natural gas commodity derivative contracts no longer qualified for hedge accounting following the announcement of the sale of ERT (Note 2).