Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Consolidated Balance Sheets [Abstract]
Allowances	$ 5,533	$ 5,214
Convertible preferred stock dividend rate	5.50%	5.50%
5-1/2 percent convertible preferred stock, cumulative, voting, par value
5-1/2 percent convertible preferred stock, cumulative, voting, shares authorized	2,000,000	2,000,000
5-1/2 percent convertible preferred stock, cumulative, voting, shares issued	61,935	518,293
5-1/2 percent convertible preferred stock, cumulative, voting, shares outstanding	61,935	518,293
Common stock, par value	$ 1	$ 1
Common stock, shares authorized	30,000,000	30,000,000
Common stock, shares issued	25,141,610	23,418,624
Treasury stock, shares	3,175,638	2,925,960