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Consolidated Statements of Operations (Unaudited) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Consolidated Statements of Operations [Abstract]        
General and administrative expense $ 4,790 $ 5,100 $ 14,681 $ 15,554
Operating loss (4,790) (5,100) (14,681) (15,554)
Other income (loss), net 91 (324) 7,994 (1,391)
Interest income 696 278 2,190 969
Interest expense (1,461) (1,445) (4,369) (4,522)
Equity income (loss) (3,293) 28,922 (19,688) 155,634
Net income (loss) before income taxes (8,757) 22,331 (28,554) 135,136
Income tax benefit (expense)            
Net income (loss) $ (8,757) $ 22,331 $ (28,554) $ 135,136
Net income (loss) per share:        
Basic $ (0.42) $ 1.07 $ (1.36) $ 6.52
Diluted $ (0.42) $ 0.98 $ (1.36) $ 5.68
Average shares used in computing net income (loss) per share:        
Basic 20,999 20,790 20,935 20,737
Diluted 20,999 24,291 20,935 24,573