Share-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Summary of Stock Option Activity

The following table summarizes stock option activity for the six months ended June 30, 2015.

	Number of Options		Weighted- average Exercise Price		Weighted- average Remaining Contractual Term in Years	Aggregate Intrinsic Value
(amounts in thousands, except Weighted-average exercise price)
Outstanding at January 1, 2015	3,168,067		$	12.61
Granted	600		26.89
Exercised	(31,168	)	10.53			$	455
Forfeited	—		—
Outstanding at June 30, 2015	3,137,499		$	12.63	6.73	$	44,744
Exercisable at June 30, 2015	586,858		$	8.95	4.75	$	10,533

Summary of Restricted Stock Activity

The following table summarizes restricted stock unit activity for the six months ended June 30, 2015.

	Restricted Stock Units		Weighted- average Grant- date Fair Value
Outstanding and unvested at January 1, 2015	788,971		$	13.00
Granted	158,581		19.67
Vested	(65,166	)	12.01
Forfeited	(2,339	)	14.99
Outstanding and unvested at June 30, 2015	880,047		$	14.27