Consolidated Statements of Cash Flows (Parenthetical) (5.5% Convertible Senior Subordinated Notes due 2012)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
5.5% Convertible Senior Subordinated Notes due 2012
Interest rate on convertible debentures	5.50%	5.50%	5.50%