Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Consolidated Statements of Operations [Abstract]
General and administrative expense	$ 5,570	$ 4,910	$ 10,454	$ 9,743
Operating loss	(5,570)	(4,910)	(10,454)	(9,743)
Other income (loss), net	(775)	14,408	(1,067)	3,111
Interest income	324	239	691	336
Interest expense	(1,441)	(1,657)	(3,077)	(2,387)
Equity income (loss)	129,277	(5,357)	126,712	(10,445)
Net income (loss) before income taxes	121,815	2,723	112,805	(19,128)
Income tax expense (benefit)
Net income (loss)	$ 121,815	$ 2,723	$ 112,805	$ (19,128)
Net income (loss) per share:
Basic	$ 5.87	$ 0.13	$ 5.45	$ (0.93)
Diluted	$ 5.05	$ 0.12	$ 4.69	$ (0.94)
Average shares used in computing income (loss) per share:
Basic	20,741	20,529	20,709	20,461
Diluted	24,374	21,417	24,660	20,461

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