Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Consolidated Balance Sheets [Abstract]
Trade and other accounts receivable, allowance	$ 577	$ 151
Common stock, par value	$ 0.10	$ 0.10
Common stock, shares authorized	40,000	40,000
Common stock, shares issued	28,174	27,182
Common stock, shares outstanding	28,174	27,182