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Capital Stock and Equity Compensation (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares of capital stock reserved for possible future issuance
Shares of capital stock reserved for possible future issuance were as follows:
 
As of December 31,
 
2019
 
2018
Shares reserved for issuance under outstanding restricted stock unit awards
315,571

 
413,294

Deferred compensation to be paid in stock, including deferred stock units
7,681

 
13,498

Additional shares reserved for issuance under Rogers Corporation 2019 Long-Term Equity Compensation Plan
1,063,920

 
777,385

Shares reserved for issuance under the Rogers Corporation Global Stock Ownership Plan for Employees
91,670

 
106,344

Total
1,478,842

 
1,310,521
Schedule of weighted-average assumptions used
 
Pension Benefits
 
Other Postretirement Benefits
 
2019
 
2018
 
2019
 
2018
Weighted average assumptions used in benefit obligations:
 
 
 
 
 
 
 
Discount rate
3.25
%
 
4.25
%
 
2.75
%
 
3.75
%
Weighted average assumptions used in net periodic benefit costs:
 
 
 
 
 
 
 
Discount rate
4.25
%
 
3.70
%
 
3.75
%
 
3.25
%
Expected long-term rate of return on assets
4.69
%
 
4.94
%
 
—
%
 
—
%
Activity under our stock option plans
A summary of the activity under our stock option plans for 2019, 2018 and 2017, is presented below:
 
2019
 
2018
 
2017
 
Options
Outstanding
 
Weighted-
Average
Exercise Price
Per Share
 
Options
Outstanding
 
Weighted-
Average
Exercise Price
Per Share
 
Options
Outstanding
 
Weighted-
Average
Exercise Price
Per Share
Options outstanding, vested and exercisable as of January 1
10,950

 
$
31.99

 
33,283

 
$
36.40

 
116,575

 
$
37.76

Options exercised
(10,650
)
 
32.21

 
(22,333
)
 
38.57

 
(83,292
)
 
37.04

Options forfeited
(300
)
 
23.86

 
—

 
—

 
—

 
—

Options outstanding, vested and exercisable as of December 31
—

 
$
—

 
10,950

 
$
31.99

 
33,283

 
$
36.40
Performance Shares  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of weighted-average assumptions used
Below were the assumptions used in the Monte Carlo calculation for each material award granted in 2019, 2018 and 2017:
 
June 3, 2019
 
February 7, 2019
 
September 17, 2018
 
February 8, 2018
 
February 9, 2017
Expected volatility
39.7%
 
36.7%
 
36.6%
 
34.8%
 
33.6%
Expected term (in years)
2.6
 
2.9
 
3.0
 
3.0
 
3.0
Risk-free interest rate
1.78%
 
2.43%
 
2.85%
 
2.28%
 
1.38%
Schedule of restricted stock and restricted stock activity
A summary of activity of the outstanding performance-based restricted stock units for 2019, 2018 and 2017 is presented below:
 
2019
 
2018
 
2017
 
Awards Outstanding
 
Weighted-
Average
Grant Date Fair Value
 
Awards Outstanding
 
Weighted-
Average
Grant Date Fair Value
 
Awards Outstanding
 
Weighted-
Average
Grant Date Fair Value
Awards outstanding as of January 1
142,434

 
$
110.19

 
169,202

 
$
97.16

 
151,769

 
$
89.72

Awards granted
112,160

 
114.22

 
75,760

 
163.55

 
56,147

 
110.77

Stock issued
(135,032
)
 
69.10

 
(81,230
)
 
131.72

 
(34,442
)
 
86.59

Awards forfeited
(12,619
)
 
152.22

 
(21,298
)
 
114.40

 
(4,272
)
 
99.35

Awards outstanding as of December 31
106,943

 
$
161.33

 
142,434

 
$
110.19

 
169,202

 
$
97.16
Time Based Restricted Stock  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of restricted stock and restricted stock activity
A summary of activity of the outstanding time-based restricted stock units for 2019, 2018 and 2017 is presented below:
 
2019
 
2018
 
2017
 
Awards Outstanding
 
Weighted-
Average
Grant Date Fair Value
 
Awards Outstanding
 
Weighted-
Average
Grant Date Fair Value
 
Awards Outstanding
 
Weighted-
Average
Grant Date Fair Value
Awards outstanding as of January 1
117,476

 
$
116.10

 
173,331

 
$
69.10

 
239,189

 
$
57.71

Awards granted
62,115

 
126.92

 
46,810

 
143.93

 
80,535

 
83.17

Stock issued
(68,111
)
 
81.53

 
(82,921
)
 
84.92

 
(140,208
)
 
58.18

Awards forfeited
(9,795
)
 
116.52

 
(19,744
)
 
112.06

 
(6,185
)
 
60.70

Awards outstanding as of December 31
101,685

 
$
122.68

 
117,476

 
$
116.10

 
173,331

 
$
69.10
Deferred Stock Units  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of restricted stock and restricted stock activity deferred stock units for 2019, 2018 and 2017 is presented below:
 
2019
 
2018
 
2017
 
Awards Outstanding
 
Weighted-
Average
Grant Date Fair Value
 
Awards Outstanding
 
Weighted-
Average
Grant Date Fair Value
 
Awards Outstanding
 
Weighted-
Average
Grant Date Fair Value
Awards outstanding as of January 1
8,400

 
$
108.86

 
9,250

 
$
109.48

 
11,900

 
$
58.82

Awards granted
5,950

 
183.40

 
8,400

 
108.86

 
9,250

 
109.48

Stock issued
(7,200
)
 
108.86

 
(9,250
)
 
109.48

 
(11,900
)
 
58.82

Awards outstanding as of December 31
7,150

 
$
170.89

 
8,400

 
$
108.86

 
9,250

 
$
109.48