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Significant Accounting Policies (Schedule Of Assets Measured At Fair Value On Recurring Basis Using Significant Unobservable Inputs (Level 3)) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Significant Accounting Policies [Abstract]  
Balance at December 31, 2010 $ 7,128
Net change in fair value included in other comprehensive income (3,663)
Other-then-temporary impairment recognized in earnings (3,465)
Balance at December 31, 2011