Share-Based Compensation Plans (Tables)

6 Months Ended

Jun. 30, 2014

Share-Based Compensation Expense

The following table presents the compensation expense associated with the Company’s share-based compensation plans for the three and six months ended June 30, 2014 and 2013:

	For the Three Months Ended June 30,					For the Six Months Ended June 30,
(in thousands)	2014			2013		2014		2013
Restricted stock units	$	3,091		$	4,197	$	11,365	$	13,698
Stock options		68			—		135		—
Employee stock purchase plan		(38	)		260		1,019		646
	$	3,121		$	4,457	$	12,519	$	14,344

Summary of RSU Activity

The following table summarizes RSU activity for the six months ended June 30, 2014:

(in thousands, except weighted‑average grant-date fair value)	Shares			Weighted-average grant-date fair value
RSUs unvested at December 31, 2013		2,720		$	17.60
Granted during 2014		645		$	26.63
Vested during 2014		(1,021	)	$	15.65
Forfeited during 2014		(15	)	$	16.46
RSUs unvested at June 30, 2014		2,329		$	20.97

Summary of Stock Option Activity

The following table summarizes stock option activity for the six months ended June 30, 2014:

(in thousands, except weighted- average exercise price and contractual term)	Number outstanding			Weighted- average exercise price		Weighted- average remaining contractual term		Aggregate intrinsic value
Balance at December 31, 2013		1,270		$	18.03
Exercised during 2014		(391	)	$	14.15
Balance at June 30, 2014		879		$	19.76		2.4 years	$	7,057
Vested and expected to vest at June 30, 2014		879		$	19.76		2.4 years	$	7,057
Exercisable at June 30, 2014		746		$	18.36		1.1 years	$	7,039