Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2014

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, 2013		7,316,713		$	7.51
Granted		916,522			11.61
Exercised		(1,468,863	)		7.18
Canceled		(130,750	)		11.97
Outstanding at December 31, 2014		6,633,622		$	8.12		3.06	$	36,612

Information about stock options outstanding, by exercise price range

	Exercise Price Range						Total
	$4.39 to $6.59		$6.64 to $10.05		$10.08 to $14.41		$4.39 to $14.41
Outstanding options
Number outstanding		1,580,299		4,082,301		971,022		6,633,622
Weighted-average remaining contractual life (years)		1.58		2.93		5.97		3.06
Weighted-average exercise price	$	5.76	$	8.20	$	11.63	$	8.12
Exercisable options
Number outstanding		1,580,299		3,248,458		47,000		4,875,757
Weighted-average exercise price	$	5.76	$	8.08	$	12.17	$	7.37

Information on restricted stock awards issued under the plans

	Number of Award Shares
Outstanding at December 31, 2013		291,811
Awarded		—
Released		(126,292	)
Canceled		(33,022	)
Outstanding at December 31, 2014		132,497