Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data	Jun. 30, 2011	Dec. 31, 2010
Condensed Consolidated Balance Sheets
Accounts and other receivables, allowances for doubtful accounts	$ 29	$ 97
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	31,548,668	31,016,812
Common stock, shares outstanding	28,760,459	28,228,603
Treasury stock, shares	2,788,209	2,788,209