Debt (Tables)

6 Months Ended

Jun. 30, 2017

Debt

Schedule of components of convertible notes

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

				Carrying Amount,
	Interest Rates			June 30,		December 31,
Debt	June 30, 2017		Maturities	2017		2016
0.375% Convertible Senior Notes due 2018	0.375	%	2018	$	7,218	$	340,916
1.25% Convertible Senior Notes due 2020	1.25	%	2020		16,210		310,565
					23,428		651,481
Less current portion					—		—
				$	23,428	$	651,481

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):

	June 30, 2017				December 31, 2016
	Carrying				Carrying
	Amount		Fair Value		Amount		Fair Value
0.375% Convertible Senior Notes due 2018	$	7,218	$	18,808	$	340,916	$	749,988
1.25% Convertible Senior Notes due 2020		16,210		47,353		310,565		761,300
	$	23,428	$	66,161	$	651,481	$	1,511,288