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Stock Incentive Plans (Tables)

12 Months Ended

Dec. 31, 2018

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Stock Option Activity

The following table summarizes stock option activity:

						Weighted-
						Average								Aggregate
		Stock				Remaining				Weighted-				Intrinsic
		Options				Term				Average				Value
		Outstanding				(in years)				Exercise Price				(in thousands)
Outstanding at January 1, 2018			4,375,929				7.9			$	10.73
Granted			—							$	—
Exercised			(813,228	)						$	7.38
Cancelled			(117,635	)						$	12.15
Expired			(20,311	)						$	7.34
Outstanding at December 31, 2018			3,424,755				7.4			$	11.49			$	17,603
Exercisable at December 31, 2018			2,193,274				7.2			$	10.63			$	12,811

Schedule of Assumptions Used to Estimate the Fair Value of Stock Options Granted

The following assumptions were used to estimate the fair value of stock options granted:

		Year Ended December 31,
		2017				2016
Expected dividend yield			—				—
Risk-free interest rate		2.21 – 2.47%				1.43 – 2.40%
Expected term (in years)			10				10
Expected volatility		29.07 – 34.43%				24.03 – 26.95%

Summary of RSU Activity

The following table summarizes RSU activity:

		RSUs
										Total
						Weighted-				Fair Value
						Average				of Shares
						Grant Date				Vested
		Shares				Fair Value				(in thousands)
Outstanding at January 1, 2016			—
Granted			141,296			$	12.57
Outstanding at December 31, 2016			141,296			$	12.57
Granted			—
Vested			(111,660	)		$	12.57			$	2,556
Cancelled			(29,636	)		$	12.57
Outstanding at December 31, 2017			—
Granted			241,542			$	29.09
Vested			—							$	—
Cancelled			(9,243	)		$	28.72
Outstanding at December 31, 2018			232,299			$	29.10

Summary of PSU Activity

The following table summarizes PSU activity:

		PSUs
										Total
						Weighted-				Fair Value
						Average				of Shares
						Grant Date				Vested
		Shares(1)				Fair Value				(in thousands)
Outstanding at January 1, 2017			—
Granted			62,791			$	27.87
Vested			—							$	—
Cancelled			—
Outstanding at December 31, 2017			62,791			$	27.87
Granted			108,957			$	28.72
Vested			—							$	—
Cancelled			—
Outstanding at December 31, 2018			171,748			$	28.41

__________________

⁽¹⁾ The number of shares listed for PSUs granted during 2017 represents the actual number of PSUs granted to each recipient eligible to vest if the Company meets its performance goals for the applicable period. The number of shares listed for PSUs granted during 2018 represents the “target” number of PSUs granted to each recipient eligible to vest if the Company meets its “target” performance goals for the applicable period. The actual number of PSUs eligible to vest with respect to PSUs granted in 2018 will vary depending on whether or not the Company meets or exceeds the applicable threshold, target or maximum performance goals for the PSUs, with 200% of the “target” number of PSUs eligible to vest at “maximum” performance levels.

Summary of Share-based Compensation Costs by Award Type

The following table summarizes share-based compensation costs by award type:

		Year Ended December 31,
(In thousands)		2018				2017				2016
Stock options		$	5,191			$	5,135			$	3,717
RSUs			3,383				3,554				161
PSUs			1,067				65				—
Total share-based compensation costs		$	9,641			$	8,754			$	3,878

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Tabular disclosure for share-based compensation plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.

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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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Tabular disclosure of the number and weighted-average grant date fair value for outstanding performance shares.

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