Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Accounts receivable, allowances	$ 11,100	$ 11,600
Preferred stock, par value	$ 1	$ 1
Preferred stock, authorized	5,000,000	5,000,000
Preferred stock, issued
Common stock, par value	$ 0.25	$ 0.25
Common stock, authorized	600,000,000	600,000,000
Common stock, issued	76,257,057	77,436,263
Common stock, outstanding	76,257,057	77,436,263