CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Statement Of Financial Position [Abstract]
Trade accounts receivable, allowance (in dollars)	$ 584	$ 2,757
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	100,000	100,000
Common stock, shares issued	34,730	33,991
Common stock, shares outstanding	34,730	33,991