Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 30, 2011	Dec. 31, 2010
Current assets:
Allowance for doubtful accounts, trade accounts receivable	$ 100	$ 100
Long-term liabilities:
Interest rate on long term debt	7.00%	7.00%
Equity:
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	3,000,000	3,000,000
Preferred stock, shares issued	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	29,095,000	28,514,000
Treasury stock, shares	0	3,000
Senior Notes Member
Long-term liabilities:
Interest rate on long term debt	7.00%	7.00%
Senior convertible notes
Long-term liabilities:
Interest rate on long term debt	3.75%	3.75%