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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule Of Option Activity And Changes
Option activity and changes during the year ended December 31, 2018 were as follows:
 
 
Options
 
Weighted
Average
Exercise
Price
 
Weighted
Average
Remaining
Term
(Years)
 
Aggregate
Intrinsic
Value
Outstanding at December 31, 2017
 
1,269,601

 
$
41.04

 
 
 
 
Granted
 
173,195

 
107.75

 
 
 
 
Exercised
 
(323,182
)
 
28.81

 
 
 
 
Cancelled
 
(3,660
)
 
77.16

 
 
 
 
Outstanding at December 31, 2018
 
1,115,954

 
$
54.82

 
6.1
 
$
20

Exercisable at December 31, 2018
 
628,926

 
$
39.05

 
4.5
 
$
17
Schedule Of Range Of Exercise Prices For Outstanding Options
For options outstanding at December 31, 2018, the options had the following range of exercise prices:
Range of Prices
 
Options 
Outstanding
 
Weighted
Average
Remaining 
Contractual
Life (Years)
$7.12 - $30.05
 
272,632

 
1.9
$40.38 - $44.42
 
223,589

 
7.1
$45.70 - $61.87
 
300,549

 
7.5
$63.98 - $68.09
 
112,386

 
5.7
$68.18 - $107.75
 
206,798

 
8.6
Schedule Of Weighted Average Value And Assumptions For Fair Value Of Options
The Company used the Black-Scholes option pricing model to value its options. The table below presents the weighted average value and assumptions used in determining each option's fair value. Volatility was calculated using historical trends of the Company's common stock price.
 
 
Stock Option Grants
 
 
Year Ended December 31,
 
 
2018
 
2017
 
2016
Weighted average fair value
 
$
28.94

 
$
15.84

 
$
11.67

Risk-free interest rate
 
2.7
%
 
2.1
%
 
1.4
%
Expected life in years
 
5

 
5

 
5

Expected volatility
 
27.6
%
 
29.2
%
 
32.9
%
Expected dividend yield
 
0.7
%
 
1.2
%
 
1.6
%
Schedule Of Non-Vested Restricted Stock Award Activity And Changes
Non-vested restricted stock units as of December 31, 2018 and changes during the year ended December 31, 2018 were as follows:
 
 
Number of
Units
 
Weighted
Average
Grant Date
Fair Value
Non-vested at December 31, 2017
 
663,866

 
$
56.86

Granted
 
146,811

 
106.58

Vested
 
(95,449
)
 
65.32

Forfeited
 
(12,439
)
 
74.46

Non-vested at December 31, 2018
 
702,789

 
$
65.79
Axiall Corporation [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule Of Weighted Average Value And Assumptions For Fair Value Of Options
The table below presents the assumptions used in determining each liability classified restricted stock unit's fair value. Volatility was calculated using historical trends of the Company's common stock price.
 
 
Liability Classified Restricted Stock Awards
 
 
Year Ended December 31, 2018
Weighted average vesting period in years
 
0.3
 
Risk-free interest rate
 
2.5
%
Expected volatility
 
32.9
%
Expected dividend yield
 
1.5
%
Schedule Of Non-Vested Restricted Stock Award Activity And Changes
Non-vested liability classified restricted stock awards as of December 31, 2018 and changes during the year ended December 31, 2018 were as follows:
 
 
Number of
Units
 
Weighted Average Fair Value
Non-vested at December 31, 2017
 
100,992

 
$
106.53

Vested
 
(48,845
)
 
116.99

Cancelled
 
(2,619
)
 
99.50

Non-vested at December 31, 2018
 
49,528

 
$
66.46