Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Consolidated Balance Sheets [Abstract]
Accounts receivable, allowances	$ 10,000	$ 10,500
Preferred stock, par value	$ 1	$ 1
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Common stock, par value	$ 0.25	$ 0.25
Common stock, shares authorized	600,000,000	600,000,000
Common stock, shares issued	84,543,338	84,973,586
Common stock, shares outstanding	84,543,338	84,973,586