Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2015

Stock-Based Compensation

Information on stock options issued under the plans

	Number of Option Shares			Weighted-Average Exercise Price		Weighted- Average Remaining Contractual Term (in years)		Aggregate Intrinsic Value (in thousands)
Outstanding at December 31, 2014		6,633,622		$	8.12
Granted		1,752,833			13.50
Exercised		(1,931,946	)		6.76
Canceled		(72,933	)		11.64
Outstanding at December 31, 2015		6,381,576		$	9.97		3.57	$	40,029

Information about stock options outstanding, by exercise price range

        The following table summarizes information about stock options outstanding at December 31, 2015:

	Exercise Price Range						Total
	$6.34 to $9.52		$9.53 to $14.36		$14.41 to $18.61		$6.34 to $18.61
Outstanding options
Number outstanding		3,330,058		2,878,346		173,172		6,381,576
Weighted-average remaining contractual life (years)		2.18		5.01		6.38		3.57
Weighted-average exercise price	$	7.71	$	12.20	$	16.34	$	9.97
Exercisable options
Number outstanding		3,083,777		654,480		1,000		3,739,257
Weighted-average exercise price	$	7.62	$	10.52	$	14.41	$	8.13

Information on restricted stock awards issued under the plans

	Number of Award Shares
Outstanding at December 31, 2014		132,497
Awarded		57,406
Released		(47,502	)
Canceled		(15,405	)
Outstanding at December 31, 2015		126,996