Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Common Stock, Par or Stated Value Per Share	$ 0.25
Preferred Stock, Shares Authorized	300	300
Preferred Stock, Shares Outstanding	0	0
Treasury Stock, Shares	3,135	3,100
Common Class A [Member]
Common Stock, Shares Authorized	100,000	100,000
Common Stock, Shares, Issued	33,952	33,835
Common Stock, Par or Stated Value Per Share	$ 0	0
Common Class B [Member]
Common Stock, Shares Authorized	12,000	12,000
Common Stock, Shares, Issued	1,086	1,086
Common Stock, Par or Stated Value Per Share	$ 0	0