Consolidated Statements of Changes in Shareholders' Equity (Parenthetical)	Dec. 31, 2010
Common Stock
Interest Senior Secured Notes	6.50%
Common Stock | 3.25% Convertible Senior Notes [Member]
Interest rate on notes	3.25%
Common Stock | 1.25% Convertible Senior Notes due January 2024 [Member]
Interest rate on notes	1.25%
Additional Paid-In Capital
Interest Senior Secured Notes	6.50%
Additional Paid-In Capital | 3.25% Convertible Senior Notes [Member]
Interest rate on notes	3.25%
Additional Paid-In Capital | 1.25% Convertible Senior Notes due January 2024 [Member]
Interest rate on notes	1.25%