Discontinued Operations (Composition Of Assets And Liabilities Included In Discontinued Operations Held For Sale) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Discontinued Operations [Abstract]
Current assets (excluding cash and cash equivalents)	$ 10,465	$ 43,500
Property, plant and equipment	53,025	184,357
Deferred tax assets	9,816	14,731
Other assets, net	43	39,153
Total assets	73,349	281,741
Current liabilities	11,689	30,148
Deferred tax liabilities		72,663
Deferred revenue	34,320
Other liabilities	29,892	5,781
Total liabilities	$ 75,901	$ 108,592