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Other Investments (Summary Of Financial Information For Midas) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended 108 Months Ended 135 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Mar. 31, 2013
Dec. 31, 2001
Other Investments [Abstract]              
Total current assets $ 60,821   $ 91,429     $ 60,821  
Total non-current assets 43,802   41,636     43,802  
Total current liabilities 29,136   31,087     29,136  
Total non-current liabilities 635   635     635  
Total equity 74,852   101,343 141,223 58,342 74,852 1,614
Operating expense (9,736) (6,997)       (73,432)  
Net income/(loss) $ (27,406) $ (11,226) $ (70,656) $ 51,546 $ (81,274) $ (127,790)