Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Condensed Consolidated Balance Sheets [Abstract]
Accounts receivable, reserves	$ 3,784	$ 3,533
Common stock, par value	$ 0.10	$ 0.10
Common stock, shares authorized	120,000,000	120,000,000
Common stock, shares issued	101,554,000	101,188,000
Deferred stock units, outstanding	122,000	122,000
Treasury stock, shares	50,264,000	49,649,000