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Capital Stock and Equity Compensation (Tables)
 12 Months Ended
Dec. 31, 2018
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,
 
2018
 
2017
Shares reserved for issuance under the stock acquisition program(1)
—

 
120,883

Shares reserved for issuance under the Rogers Employee Savings and Investment Plan(2)
—

 
169,044

Shares reserved for issuance under outstanding stock options and restricted stock unit awards
413,294

 
545,018

Deferred compensation to be paid in stock, including deferred stock units
13,498

 
17,100

Additional shares reserved for issuance under Rogers Corporation 2009 Long-Term Equity Compensation Plan(3)
777,385

 
793,603

Shares reserved for issuance under the Rogers Corporation Global Stock Ownership Plan for Employees
106,344

 
117,987

Total
1,310,521

 
1,763,635


(1) 
The Company ceased offering capital stock under the stock acquisition program prior to the periods covered by this table.
(2) 
The Company ceased offering its capital stock as an investment option under the Rogers Employee Savings and Investment Plan prior to the periods covered by this table.
(3) This plan expired in early February 2019, and these shares are no longer available for issuance thereunder.
Schedule of weighted-average assumptions used
Weighted-average assumptions used to determine benefit obligations at December 31:
 
Pension Benefits
 
Retirement Health and Life Insurance Benefits
 
2018
2017
 
2018
2017
Discount rate
4.25
%
3.70
%
 
3.75
%
3.25
%
Weighted-average assumptions used to determine net benefit cost for the years ended December 31:
 
Pension Benefits
 
Retirement Health and Life Insurance Benefits
 
2018
2017
 
2018
2017
Discount rate
3.70
%
4.25
%
 
3.25
%
3.25
%
Expected long-term rate of return on plan assets
4.94
%
5.51
%
 
—
%
—
%
Activity under our stock option plans
A summary of the activity under our stock option plans for 2018, 2017 and 2016, is presented below:
 
2018
 
2017
 
2016
 
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
33,283

 
$
36.40

 
116,575

 
$
37.76

 
212,038

 
$
40.47

Options exercised
(22,333
)
 
38.57

 
(83,292
)
 
37.04

 
(95,113
)
 
43.56

Options forfeited
—

 
—

 
—

 
—

 
(350
)
 
44.32

Options outstanding, vested and exercisable as of December 31
10,950

 
$
31.99

 
33,283

 
$
36.40

 
116,575

 
$
37.76
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 on the respective grant dates for awards granted in 2018 and 2017:
 
September 17, 2018
 
February 8, 2018
 
February 9, 2017
Expected volatility
36.6%
 
34.8%
 
33.6%
Expected term (in years)
3.0
 
3.0
 
3.0
Risk-free interest rate
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 2018, 2017 and 2016 is presented below:
 
2018
 
2017
 
2016
 
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
169,202

 
$
97.16

 
151,769

 
$
89.72

 
107,229

 
$
66.13

Awards granted
75,760

 
163.55

 
56,147

 
110.77

 
84,443

 
69.01

Stock issued
(81,230
)
 
131.72

 
(34,442
)
 
86.59

 
(25,397
)
 
72.68

Awards forfeited
(21,298
)
 
114.40

 
(4,272
)
 
99.35

 
(14,506
)
 
104.83

Awards outstanding as of December 31
142,434

 
$
110.19

 
169,202

 
$
97.16

 
151,769

 
$
89.72
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 2018, 2017 and 2016 is presented below:
 
2018
 
2017
 
2016
 
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
173,331

 
$
69.10

 
239,189

 
$
57.71

 
208,318

 
$
64.27

Awards granted
46,810

 
143.93

 
80,535

 
83.17

 
118,660

 
51.70

Stock issued
(82,921
)
 
84.92

 
(140,208
)
 
58.18

 
(60,326
)
 
64.03

Awards forfeited
(19,744
)
 
112.06

 
(6,185
)
 
60.70

 
(27,463
)
 
64.60

Awards outstanding as of December 31
117,476

 
$
116.10

 
173,331

 
$
69.10

 
239,189

 
$
57.71
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 2018, 2017 and 2016 is presented below:
 
2018
 
2017
 
2016
 
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
9,250

 
$
109.48

 
11,900

 
$
58.82

 
23,950

 
$
27.22

Awards granted
8,400

 
108.86

 
9,250

 
109.48

 
11,900

 
58.82

Stock issued
(9,250
)
 
109.48

 
(11,900
)
 
58.82

 
(23,950
)
 
52.69

Awards outstanding as of December 31
8,400

 
$
108.86

 
9,250

 
$
109.48

 
11,900

 
$
58.82