Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2011	Dec. 31, 2010
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Common Stock, Shares Authorized	40,000,000	40,000,000
Common Stock, Shares, Issued	24,658,985	24,382,991
Common Stock, Shares, Outstanding	18,060,206	18,183,083
Treasury Stock, Shares	6,598,779	6,199,908
Convertible Preferred Stock [Member] | Series B [Member]
Preferred Stock, Shares Authorized	10,000,000	10,000,000
Preferred Stock, Shares Issued	35,000	35,000
Preferred Stock, Shares Outstanding	34,900	35,000