Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Condensed Consolidated Balance Sheets [Abstract]
Accounts and other receivables, allowances for doubtful accounts	$ 21	$ 21
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	32,110,360	31,786,030
Common stock, shares outstanding	28,182,154	27,857,824
Treasury stock, shares	3,928,206	3,928,206