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Stock-based Compensation (Tables)
 6 Months Ended
Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Restricted Stock Activity
A summary of all restricted stock activity under the equity compensation plans for the six months ended June 30, 2018 is as follows:
 
 
For the Six Months Ended June 30, 2018
 
 
Number of Shares
 
Weighted Average Grant Date Fair Value per Share
Nonvested outstanding at the beginning of the period
 
—

 
$
—

Granted
 
94,270

 
$
52.99

Vested
 
—

 
$
—

Forfeited
 
—

 
$
—

Nonvested outstanding at the end of the period
 
94,270

 
$
52.99
Stock Options Valuation Assumptions
The value of the options granted was estimated at the date of grant using the Black-Scholes pricing model using the following assumptions:
Risk-free rate of return
 
1.26
%
Dividend yield
 
1.25
%
Expected share price volatility(1)
 
18.50
%
Expected life in years(2)
 
6.3 years
Stock Options Activity
A summary of option activity as of June 30, 2018, and changes during the period then ended is presented below:
 
 
Number of Shares
 
Weighted-average exercise price
 
Weighted-average remaining years of contractual term
 
Aggregate intrinsic value (in thousands)
Outstanding at January 1, 2018
 
930,440

 
$
16.00

 
 
 
 
Granted
 
—

 
—

 
 
 
 
Forfeited
 
(8,985
)
 
16.00

 
 
 
 
Exercised
 
(39,027
)
 
16.00

 
 
 
 
Outstanding at June 30, 2018
 
882,428

 
$
16.00

 
8.1
 
$
34,291

Exercisable at June 30, 2018
 
179,803

 
$
16.00

 
8.1
 
$
6,987