CONVERTIBLE SENIOR NOTES	6 Months Ended
Jun. 30, 2016
CONVERTIBLE SENIOR NOTES	10. CONVERTIBLE SENIOR NOTES In 2010, the Company issued $600.0 million in aggregate principal amount of its 4% Convertible Senior Notes for net proceeds of approximately $582.0 million. In 2012, the Company repurchased $492.5 million in aggregate principal amount of its 4% Convertible Senior Notes. In February 2015, the 4% Convertible Senior Notes matured and the Company repaid the remaining 4% Convertible Senior Notes for the face amount of $107.5 million. In May 2012, the Company issued $750.0 million in aggregate principal amount of its 5% Convertible Senior Notes due 2015 for net proceeds of approximately $727.5 million. In May 2015, the 5% Convertible Senior Notes matured and the Company repaid the 5% Convertible Senior Notes for the face amount of $750.0 million.

10. CONVERTIBLE SENIOR NOTES

In 2010, the Company issued $600.0 million in aggregate principal amount of its 4% Convertible Senior Notes for net proceeds of approximately $582.0 million. In 2012, the Company repurchased $492.5 million in aggregate principal amount of its 4% Convertible Senior Notes. In February 2015, the 4% Convertible Senior Notes matured and the Company repaid the remaining 4% Convertible Senior Notes for the face amount of $107.5 million.

In May 2012, the Company issued $750.0 million in aggregate principal amount of its 5% Convertible Senior Notes due 2015 for net proceeds of approximately $727.5 million. In May 2015, the 5% Convertible Senior Notes matured and the Company repaid the 5% Convertible Senior Notes for the face amount of $750.0 million.