CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Current assets:
Accounts receivable, allowances for doubtful accounts	$ 1,547	$ 685
Stockholders' equity:
Common Stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common Stock, shares authorized (in shares)	100,000,000	100,000,000
Common Stock, shares issued (in shares)	24,175,051	24,713,126
Common Stock, shares outstanding (in shares)	24,175,051	24,713,126