Share-Based Payments (Tables)

9 Months Ended

Sep. 30, 2015

Share-Based Payments

Summary of share-based compensation expense (income)

The following table summarizes share-based compensation expense (income) recorded in the three and nine months ended September 30, 2015 and 2014 (in thousands):

Share-based compensation expense (income)	For the Three Months Ended September 30, 2015		For the Three Months Ended September 30, 2014		For the Nine Months Ended September 30, 2015			For the Nine Months Ended September 30, 2014
Outstanding employee and non-employee stock option grants	$	2,769	$	2,505	$	7,785		$	7,257
Outstanding restricted stock awards	1,691		780		(1,282		)	2,935
Employee stock purchase plan	97		114		284			323
Total compensation cost	$	4,557	$	3,399	$	6,787		$	10,515

Schedule of weighted average assumptions

	Weighted Average Assumptions
	Stock Options				Employee Stock Purchase Plan
	For the Three Months Ended September 30, 2015		For the Three Months Ended September 30, 2014		For the Three Months Ended September 30, 2015		For the Three Months Ended September 30, 2014
Expected volatility	53	%	61	%	58	%	63	%
Expected dividends	—		—		—		—
Expected life (years)	6.2		6.3		0.5		0.5
Risk-free interest rate	1.9	%	2.2	%	0.1	%	0.1	%

	Weighted Average Assumptions
	Stock Options				Employee Stock Purchase Plan
	For the Nine Months Ended September 30, 2015		For the Nine Months Ended September 30, 2014		For the Nine Months Ended September 30, 2015		For the Nine Months Ended September 30, 2014
Expected volatility	60	%	66	%	59	%	63	%
Expected dividends	—		—		—		—
Expected life (years)	6.1		6.1		0.5		0.5
Risk-free interest rate	1.8	%	2.2	%	0.1	%	0.1	%

Schedule of nonvested shares of restricted stock

A summary of the status of nonvested shares of restricted stock as of September 30, 2015 and the changes during the nine months then ended are presented below (in thousands, except fair values):

	Number of Shares		Weighted Average Grant Date Fair Value
Nonvested at January 1, 2015	1,174		$	15.15
Granted	255		13.19
Vested	(484	)	15.11
Forfeited	(149	)	14.56
Nonvested at September 30, 2015	796		$	14.66

Summarized information about time-based or performance-based vesting schedules

Nonvested shares of restricted stock that have time-based or both performance-based and time-based vesting conditions as of September 30, 2015 are summarized below (in thousands):

Vesting Schedule	Nonvested Shares
Time-based	483
Performance-based and time-based	313
Nonvested at September 30, 2015	796