Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2017

Stock-Based Compensation

Information on stock options issued under the plans

				Weighted-
				Average
				Remaining	Aggregate
	Number of Option	Weighted-Average		Contractual	Intrinsic Value
	Shares	Exercise Price		Term (in years)	(in thousands)
Outstanding at December 31, 2016	6,326,593	$	11.17
Granted	1,486,790		14.26
Exercised	(1,226,345)		8.81
Canceled	(35,724)		14.38
Outstanding at December 31, 2017	6,551,314	$	12.29	3.98	$	124,709

Information about stock options outstanding, by exercise price range

	Exercise Price Range						Total
	$6.96 to		$11.12 to		$16.59 to		$6.96 to
	$10.41		$16.02		$20.75		$20.75
Outstanding options
Number outstanding		1,178,054		5,283,711		89,549		6,551,314
Weighted-average remaining contractual life (years)		0.77		4.67		5.48		3.98
Weighted-average exercise price	$	8.16	$	13.11	$	18.36	$	12.29
Exercisable options
Number outstanding		1,176,804		1,915,712		13,661		3,106,177
Weighted-average exercise price	$	8.16	$	12.60	$	16.59	$	10.94

Information on restricted stock awards issued under the plans

	Number of Award
	Shares
Outstanding at December 31, 2016	175,886
Awarded	176,865
Released	(68,257)
Canceled	(16,839)
Outstanding at December 31, 2017	267,655