CONSOLIDATED BALANCE SHEETS (PARENTHETICAL) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Statement of Financial Position [Abstract]
Accounts receivable, allowances	$ 722	$ 443
Preferred Stock, Par or Stated Value Per Share	$ 0.001
Preferred Stock, Shares Authorized	5,000,000
Preferred Stock, Shares Issued	0
Common Stock, Par or Stated Value Per Share	$ 0.001
Common Stock, Shares Authorized	100,000,000
Common Stock, Shares, Issued	39,493,469	38,235,745
Common Stock, Shares, Outstanding	33,541,000	33,182,000
Treasury Stock, Shares	5,951,976	5,053,808