Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 30, 2011	Dec. 31, 2010
Current assets:
Allowance for doubtful accounts, trade accounts receivable	$ 175	$ 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
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	28,870,000	28,513,800
Treasury stock, shares	0	3,300
Senior notes
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%