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Share-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2017

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

Option Grant Fair Value Assumptions

The fair value of option grants are estimated on the grant date using the Black-Scholes option-pricing model with the following weighted-average assumptions for option grants during the periods indicated below:

		Year Ended December 31,
		2017				2016				2015
Expected volatility			43.95	%			46.04	%			47.15	%
Expected dividends			0.00	%			0.00	%			0.00	%
Expected term (in years)			5.96				5.80				6.15
Risk-free rate			2.09	%			1.32	%			1.62	%

Summary of Company's Stock Option Plan Activity

The following table summarizes the stock option activity for the year ended December 31, 2017:

In thousands, except per share amounts		Number of Shares				Weighted-Average Exercise Price Per Share				Weighted-Average Remaining Contractual Life (Years)				Aggregate Intrinsic Value
Options outstanding at January 1, 2017			1,166			$	14.66
Granted			116				19.99
Exercised			(289	)			7.35
Forfeited			(35	)			18.30
Expired			—				—
Options outstanding at December 31, 2017			958			$	17.39				7.1			$	8,747
Options exercisable at December 31, 2017			771			$	16.99				6.8			$	7,351
Available for grant at December 31, 2017			1,275

Summary of Additional Stock Option Information

The following table provides additional stock option information for the periods indicated:

		Year Ended December 31,
In thousands, except per share amounts		2017				2016				2015
Weighted-average grant date fair value per share		$	8.90			$	7.74			$	7.13
Intrinsic value of options exercised		$	4,981			$	1,397			$	1,524
Fair value of stock options that vested		$	3,004			$	2,131			$	1,207

Summary of RSU Activity

The following table summarizes RSU activity during the year ended December 31, 2017:

In thousands, except per unit amounts		Units				Weighted-Average Grant Date Fair Value Per Unit
Non-vested units at January 1, 2017			164			$	16.07
Granted			85				19.99
Vested			—				—
Forfeited			(48	)			17.69
Non-vested units at December 31, 2017			201			$	17.33

Summary of Additional RSU Information

The following table provides additional RSU information for the periods indicated:

		Year Ended December 31,
		2017				2016				2015
Weighted-average grant date fair value per unit		$	19.99			$	17.02			$	14.89

Summary of CSPU Activity

The following table summarizes CSPU activity during the year ended December 31, 2017:

In thousands, except per unit amounts		Units				Weighted-Average Grant Date Fair Value Per Unit
Non-vested units at January 1, 2017			2,641			$	1.00
Granted			1,686				1.00
Vested			—				—
Forfeited			(843	)			1.00
Non-vested units at December 31, 2017			3,484			$	1.00

Summary of Restricted Stock Activity

The following table summarizes restricted stock activity during the year ended December 31, 2017:

In thousands, except per share amounts		Shares				Weighted-Average Grant Date Fair Value Per Share
Non-vested shares at January 1, 2017			39			$	16.46
Granted			83				18.38
Vested			(60	)			16.30
Forfeited			(9	)			18.25
Non-vested shares at December 31, 2017			53			$	19.36

Summary of Additional Restricted Stock Information

The following table provides additional restricted stock information.

		Year Ended December 31,
In thousands, except per share amounts		2017				2016				2015
Weighted-average grant date fair value per share		$	18.38			$	16.37			$	15.36
Fair value of restricted stock awards that vested		$	983			$	347			$	2,198

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