Debt (Tables)

9 Months Ended

Sep. 30, 2016

Debt

Schedule of components of convertible notes

The components of the convertible notes are as follows (in thousands):

				Carrying Amount,
	Interest Rates			September 30,		December 31,
Debt	September 30, 2016		Maturities	2016		2015
0.375% Convertible Senior Notes due 2018	0.375	%	2018	$	336,613	$	324,031
1.25% Convertible Senior Notes due 2020	1.25	%	2020		306,821		295,862
					643,434		619,893
Less current portion					—		—
				$	643,434	$	619,893

Schedule of carrying amount and fair value of convertible notes

The carrying amount and fair value of our convertible notes are as follows (in thousands):

	September 30, 2016				December 31, 2015
	Carrying				Carrying
	Amount		Fair Value		Amount		Fair Value
0.375% Convertible Senior Notes due 2018	$	336,613	$	711,551	$	324,031	$	807,422
1.25% Convertible Senior Notes due 2020		306,821		724,994		295,862		816,123
	$	643,434	$	1,436,545	$	619,893	$	1,623,545