Stock Compensation Plan (Tables)

3 Months Ended

Mar. 31, 2019

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

Schedule of stock options awarded

The following table presents information regarding Options awarded during the three months ended March 31, 2019: 

Options granted	1,338
Per share weighted average exercise price	$	69.20
Per share weighted average grant date fair value	$	11.50

Schedule of assumptions used to determine the grant date fair value of options granted

The weighted-average grant date fair value for Options granted during the three months ended March 31, 2019 was estimated using the Black-Scholes option valuation model with the following assumptions: 

Expected term in years	5.0
Risk free interest rate	2.6	%
Volatility	22.9	%
Dividend yield	3.0	%

Schedule of stock options vested during the period

The following table presents information regarding Options that vested during the three months ended March 31, 2019: 

Options vested	104,577
Aggregate grant date fair value of Options vested (in millions)	$	1.5

Schedule of outstanding stock options

The following table presents information regarding outstanding Options:

	March 31, 2019		December 31, 2018
Options outstanding	437,539		451,081
Aggregate intrinsic value (in millions)	$	3.3	$	2.7
Per share weighted average exercise price	$	68.81	$	67.46
Exercisable Options	333,235		240,903
Aggregate intrinsic value (in millions)	$	3.3	$	2.6
Unvested Options	104,304		210,178
Per share weighted average grant date fair value	$	14.43	$	14.21