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Capital Stock and Equity Compensation (Tables) | 12 Months Ended
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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 |

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