Condensed Consolidated Balance Sheet (Unaudited) (Parenthetical) (USD $) In Thousands, except Share data	Sep. 30, 2011	Dec. 31, 2010
Current assets:
Allowance for doubtful accounts	$ 778	$ 478
Shareholders' equity:
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	30,935,132	30,858,725
Common stock, shares outstanding	30,187,961	30,123,519
Treasury stock, shares at cost	747,171	735,206