Earnings per Share (Tables)

12 Months Ended

Dec. 31, 2016

Earnings per Share

Schedule of common stock equivalents excluded in the calculation of diluted income per share

	Year Ended December 31,
	2016		2015		2014
Shares underlying Convertible Senior Secured Notes		—		—		7,995,340
Warrants to purchase common stock		—		20,957		20,499
Stock options, stock appreciation rights, and ESPP awards		—		—		306,776

Schedule of computation of basic and diluted net income per share

The following table sets forth the computation of basic and diluted net income per share for the years ended December 31, 2016, 2015 and 2014, in thousands, except share and per share amounts:

	Year ended December 31,
	2016			2015			2014
Numerator, in thousands:
Net income (loss) used for calculation of basic EPS	$	91,221		$	13,944		$	(10,925	)
Interest expense on convertible debt		543			1,229			—
Changes in fair value of derivative liabilities		(448	)		(589	)		—
Loss on extinguishment of debt		671			2,338			—
Loss on extinguishment of outstanding debt, as if converted		(1,182	)		(2,494	)		—
Total adjustments		(416	)		484			—
Net income used for calculation of diluted EPS	$	90,805		$	14,428		$	(10,925	)
Denominator:
Weighted average shares outstanding, basic		49,472,434			47,485,258			42,260,896
Effect of dilutive potential common shares:								—
Shares underlying Convertible Senior Secured Notes		1,222,363			2,459,009
Shares issuable to settle interest make-whole derivatives		71,537			804,507			—
Stock options and stock appreciation rights		942,649			411,606			—
Total potential dilutive common shares		2,236,549			3,675,122			—
Weighted average shares outstanding, diluted		51,708,983			51,160,380			42,260,896
Net income (loss) per share, basic	$	1.84		$	0.29		$	(0.26	)
Net income (loss) per share, diluted	$	1.76		$	0.28		$	(0.26	)