Consolidated Balance Sheets Parenthetical - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Allowances	$ 1,240	$ 1,206
Common Stock, Par Value	$ 0.001	$ 0.001
Common Stock, Shares Authorized	100,000,000	100,000,000
Common Stock, Shares, Issued	44,739,000	43,537,000
Common Stock, Shares, Outstanding	35,594,000	35,816,000
Treasury Stock, Shares	(9,145,000)	(7,721,000)
Preferred Stock, Par or Stated Value Per Share	$ 0.001	$ 0.001
Preferred Stock, Shares Authorized	5,000,000	5,000,000