CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) (USD $) In Thousands, except Share data	Jun. 30, 2011	Dec. 31, 2010
Current assets:
Accounts receivable, allowance for doubtful accounts	$ 200	$ 215
LIABILITIES AND STOCKHOLDERS' EQUITY
Preferred Stock of subsidiary, par value (in dollars per share)	$ 1.00	$ 1.00
Preferred Stock of Subsidiary, authorized (in shares)	1,467,396	1,467,396
Preferred Stock of subsidiary, issued (in shares)	1,284,730	1,284,730
Preferred Stock of subsidiary, outstanding (in shares)	1,284,730	1,284,730
Preferred Stock of subsidiary, liquidation value per share (in dollars per share)	$ 1.00	$ 1.00
Stockholders' equity:
Preferred Stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred Stock, authorized (in shares)	2,000,000	2,000,000
Preferred Stock, issued (in shares)	0	0
Preferred Stock, outstanding (in shares)	0	0
Common Stock, par value ( in dollars per share)	$ 0.001	$ 0.001
Common Stock, authorized (in shares)	75,000,000	75,000,000
Common Stock, issued (in shares)	55,175,897	55,106,180
Common Stock, outstanding (in shares)	55,137,687	55,067,970
Common Stock in treasury (in shares)	38,210	38,210