Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Condensed Consolidated Balance Sheets [Abstract]
Accounts receivable, allowances	$ 12,100	$ 10,000
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	83,927,711	84,543,338
Common stock, shares outstanding	83,927,711	84,543,338