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Share-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Option Grant Fair Value Assumptions The fair value of option grants is 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:
 
 
 
Six Months Ended

June 30,
 
 
 
2019
 
 
2018
 
Expected volatility
 
 
41.14
%
 
 
41.63
%
Expected dividends
 
 
0.00
%
 
 
0.00
%
Expected term (in years)
 
 
6.0
 
 
 
6.0
 
Risk-free rate
 
 
2.55
%
 
 
2.66
%
Summary of Company's Stock Option Plan Activity
The following table summarizes the stock option activity for the six months ended June 30, 2019:

 
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, 2019
 
 
981
 
 
$
18.69
 
 
 
 
 
 
 
 
 
Granted
 
 
100
 
 
 
27.89
 
 
 
 
 
 
 
 
 
Exercised
 
 
—
 
 
 
—
 
 
 
 
 
 
 
 
 
Forfeited
 
 
—
 
 
 
—
 
 
 
 
 
 
 
 
 
Expired
 
 
—
 
 
 
—
 
 
 
 
 
 
 
 
 
Options outstanding at June 30, 2019
 
 
1,081
 
 
$
19.55
 
 
 
6.4
 
 
$
7,936
 
Options exercisable at June 30, 2019
 
 
871
 
 
$
17.83
 
 
 
5.8
 
 
$
7,715
 
Summary of Additional Stock Option Information
The following table provides additional NQSO information for the periods indicated:

 
 
 
Three Months Ended

June 30,
 
 
Six Months Ended

June 30,
 
In thousands, except per share amounts
 
2019
 
 
2018
 
 
2019
 
 
2018
 
Weighted-average grant date fair value per share
 
$
—
 
 
$
—
 
 
$
12.07
 
 
$
12.39
 
Intrinsic value of options exercised
 
$
—
 
 
$
574
 
 
$
—
 
 
$
1,604
 
Fair value of NQSOs that vested
 
$
—
 
 
$
—
 
 
$
—
 
 
$
199
 
Summary of RSU Activity
The following table summarizes RSU activity during the six months ended June 30, 2019:

 
In thousands, except per unit amounts
 
Units
 
 
Weighted-Average

Grant Date

Fair Value Per Unit
 
Non-vested units at January 1, 2019
 
 
182
 
 
$
21.89
 
Granted (target)
 
 
39
 
 
 
27.89
 
Achieved performance adjustment (1)
 
 
8
 
 
 
16.98
 
Vested
 
 
(54
)
 
 
16.98
 
Forfeited
 
 
—
 
 
 
—
 
Non-vested units at June 30, 2019
 
 
175
 
 
$
24.55
 
 
 
(1)
The 2016 LTIP RSUs were earned and vested at 116.5% of target, as described in greater detail in the Company’s definitive proxy statement filed with the SEC on March 27, 2019.
Summary of Additional RSU Information
The following table provides additional RSU information for the periods indicated:
 
 
 
Three Months Ended

June 30,
 
 
Six Months Ended

June 30,
 
In thousands, except per unit amounts
 
 
2019
 
 
2018
 
 
2019
 
 
2018
 
Weighted-average grant date fair value per unit
 
$
—
 
 
$
—
 
 
$
27.89
 
 
$
28.25
 
Fair value of RSUs that vested
 
$
—
 
 
$
—
 
 
$
916
 
 
$
—
 
Summary of RSA Activity
The following table summarizes RSA activity during the six months ended June 30, 2019:

 
In thousands, except per share amounts
 
Shares
 
 
Weighted-Average

Grant Date

Fair Value Per Share
 
Non-vested shares at January 1, 2019
 
 
71
 
 
$
26.95
 
Granted
 
 
138
 
 
 
26.92
 
Vested
 
 
(28
)
 
 
32.36
 
Forfeited
 
 
(2
)
 
 
27.22
 
Non-vested shares at June 30, 2019
 
 
179
 
 
$
26.06
 
Summary of Additional RSA Information
The following table provides additional RSA information for the periods indicated:

 
 
 
Three Months Ended

June 30,
 
 
Six Months Ended

June 30,
 
In thousands, except per share amounts
 
2019
 
 
2018
 
 
2019
 
 
2018
 
Weighted-average grant date fair value per share
 
$
24.66
 
 
$
34.39
 
 
$
26.92
 
 
$
24.70
 
Fair value of RSAs that vested
 
$
810
 
 
$
651
 
 
$
918
 
 
$
711