Quarterly report pursuant to Section 13 or 15(d)

Condensed Consolidated Statements of Cash Flows (Unaudited) (Parenthetical)

v2.4.0.8
Condensed Consolidated Statements of Cash Flows (Unaudited) (Parenthetical)
Jun. 30, 2013
Jan. 30, 2013
Dec. 31, 2012
Convertible senior notes interest rate 3.00% 3.00% 3.00%