Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Accounts receivable, allowance for doubtful accounts	$ 10,381	$ 14,636
Other intangibles, accumulated amortization	$ 20,123	$ 18,921
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, Authorized	2,000,000	2,000,000
Preferred stock, issued	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, Authorized	320,000,000	320,000,000
Common stock, issued	212,003,662	212,047,774
Common stock, outstanding	212,003,662	212,047,774