Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2014

Stock-Based Compensation

Summary of stock option activity

Presented below is a summary of our stock option activity for the nine months ended March 31, 2014 (shares in thousands):

	Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Terms	Aggregate Intrinsic Value
Outstanding at December 31, 2013	4,273		$	17.53
Granted	50		$	20.41
Exercised	(262	)	$	9.67
Forfeited	(143	)	$	23.24
Expired	(8	)	$	26.08
Outstanding at March 31, 2014	3,910		$	17.86	4.73	$	16,661
Expected to vest at March 31, 2014	1,832		$	22.53	6.27	$	1,144
Exercisable at March 31, 2014	2,035		$	13.56	3.27	$	15,485

Schedule of weighted -average assumptions used for estimating fair value of each stock option grant on the date of grant

	Three months ended March 31
	2014		2013
Expected dividend yield	—		—
Risk-free interest rate	1.65	%	0.67	%
Expected volatility	37.08	%	40.05	%
Expected life	4.81 years		4.47 years

Summary of status of restricted stock units

A summary of the status of our restricted stock units and of changes in restricted stock units outstanding under the 2006 Stock Plan, as amended, for the three months ended March 31,  2014 is as follows (in thousands, except for weighted average grant date fair value per unit):

	Number of Units		Weighted Average Grant Date Fair Value per Unit		Aggregate Intrinsic Value
Outstanding balance at December 31, 2013	636		$	25.50
Granted	242		$	20.26
Vesting of restricted stock units, net of shares withheld for taxes	(50	)	$	25.62
Shares withheld for taxes	(23	)	$	26.22
Forfeitures	(81	)	$	26.22
Outstanding balance at March 31, 2014	724		$	23.66	$	13,800

Summary of status of restricted stock awards

A summary of the status of our restricted stock awards at March 31, 2014 and of changes in restricted stock awards outstanding under the 2006 Stock Plan for the three months ended March 31, 2014 is as follows (in thousands, except for weighted average grant date fair value):

	Shares		Weighted Average Grant Date Fair Value per Share		Aggregate Intrinsic Value
Outstanding balance at December 31, 2013	82		$	10.42
Granted	—		—
Vesting of restricted stock awards	(54	)	$	10.42
Shares withheld for payment of taxes upon vesting of restricted stock awards	(28	)	$	10.42
Forfeitures	—		$	—
Outstanding balance at March 31, 2014	—		$	—	$	—