Consolidated Statements Of Financial Position (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Consolidated Statements Of Financial Position [Abstract]
Accounts receivable, allowances	$ 22,627	$ 21,569
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, authorized	5,000,000	5,000,000
Preferred stock, issued	0	0
Preferred stock, outstanding	0	0
Common stock, par value	$ 0.001	$ 0.001
Common stock, authorized	260,000,000	260,000,000
Common stock, issued	142,085,533	146,182,564
Common stock, outstanding	142,085,533	146,182,564