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) (Notes, Notes Due February 1, 2033)
Jun. 30, 2014
Dec. 31, 2013
Jan. 31, 2013
Notes | Notes Due February 1, 2033
     
Convertible senior notes interest rate 3.00% 3.00% 3.00%