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Shareholders' Equity and Stock Options (Tables) | 12 Months Ended
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Dec. 31, 2017
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,
| 2017 |  | 2016
Shares reserved for issuance under the stock acquisition program (1) | 120,883 |  |  | 120,883 |
Shares reserved for issuance under outstanding stock options and restricted stock unit awards | 545,018 |  |  | 659,302 |
Additional shares reserved for issuance under Rogers Corporation 2009 Long-Term Equity Compensation Plan | 793,603 |  |  | 892,163 |
Shares reserved for issuance under the Rogers Employee Savings and Investment Plan (2) | 169,044 |  |  | 169,044 |
Shares reserved for issuance under the Rogers Corporation Global Stock Ownership Plan for Employees | 117,987 |  |  | 133,113 |
Deferred compensation to be paid in stock, including deferred stock units | 17,100 |  |  | 22,752 |
Total | 1,763,635 |  |  | 1,997,257 |
(1) | As of December 31, 2017, the Company no longer offers capital stock under the stock acquisition program.
(2) | As of December 31, 2017, the Company no longer offers its capital stock as an investment option under the Rogers Employee Savings and Investment Plan.
Activity under our stock option plans | A summary of the activity under our stock option plans for the fiscal years ended 2017, 2016 and 2015, is presented below:
| 2017 |  | 2016 |  | 2015
| Options Outstanding |  | Weighted- Average Exercise Price Per Share |  | Options Outstanding |  | Weighted- Average Exercise Price Per Share |  | Options Outstanding |  | Weighted- Average Exercise Price Per Share
Outstanding at beginning of year | 116,575 |  |  | $ | 37.76 |  |  | 212,038 |  |  | $ | 40.47 |  |  | 393,347 |  |  | $ | 40.72 |
Options exercised | (83,292 | ) |  | 37.04 |  |  | (95,113 | ) |  | 43.56 |  |  | (178,759 | ) |  | 40.90 |
Options forfeited | — |  |  | — |  |  | (350 | ) |  | 44.32 |  |  | (2,550 | ) |  | 40.09 |
Outstanding at year-end | 33,283 |  |  | 36.40 |  |  | 116,575 |  |  | 37.76 |  |  | 212,038 |  |  | 40.47 |
Options exercisable at year-end | 33,283 |  |  |  |  | 116,575 |  |  |  |  | 204,394 |  |  |
A summary of the activity under our stock option plans as of December 31, 2017 and changes during the year then ended, is presented below:
| Options Outstanding |  | Weighted- Average Exercise Price Per Share |  | Weighted-Average Remaining Contractual Life in Years |  | Aggregate Intrinsic Value
Options outstanding at December 31, 2016 | 116,575 |  |  | $ | 37.76 |  |  | 3.2 |  | 4,552,580 |
Options exercised | (83,292 | ) |  | 37.04 |  |  |  |  |  |
Options forfeited | — |  |  | — |  |  |  |  |  |
Options outstanding at December 31, 2017 | 33,283 |  |  | 36.40 |  |  | 2.2 |  | 4,177,655 |
Options exercisable at December 31, 2017 | 33,283 |  |  | 36.40 |  |  | 2.2 |  | 4,177,655 |
Options vested at December 31, 2017 | 33,283 |  |  | 36.40 |  |  | 2.2 |  | 4,177,655 |
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
| 2017 | 2016 |  | 2017 | 2016
Discount rate | 3.70 | % | 4.25 | % |  | 3.25 | % | 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
| 2017 | 2016 |  | 2017 | 2016
Discount rate | 3.70 | % | 4.25 | % |  | 3.25 | % | 3.00 | %
Expected long-term rate of return on plan assets | 4.94 | % | 5.51 | % |  | — |  | — |
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:
| 2017 |  | 2016
Expected volatility | 33.6 | % |  | 29.6 | %
Expected term (in years) | 3 |  |  | 3 |
Risk-free interest rate | 1.38 | % |  | 0.93 | %
Schedule of restricted stock and restricted stock activity | A summary of activity under the performance-based restricted stock units plans for the fiscal years ended 2017, 2016 and 2015 is presented below:
| 2017 |  | 2016 |  | 2015
| Awards Outstanding |  | Weighted- Average Grant Date Fair Value |  | Awards Outstanding |  | Weighted- Average Grant Date Fair Value |  | Awards Outstanding |  | Weighted- Average Grant Date Fair Value
Non-vested awards outstanding at beginning of year | 151,769 |  |  | $ | 89.72 |  |  | 107,229 |  |  | $ | 66.13 |  |  | 92,437 |  |  | $ | 52.75 |
Awards granted | 56,147 |  |  | 110.77 |  |  | 84,443 |  |  | 69.01 |  |  | 51,475 |  |  | 78.01 |
Stock issued | (34,442 | ) |  | 86.59 |  |  | (25,397 | ) |  | 72.68 |  |  | (20,910 | ) |  | 41.27 |
Awards forfeited or expired | (4,272 | ) |  | 99.35 |  |  | (14,506 | ) |  | 104.83 |  |  | (15,773 | ) |  | 59.45 |
Non-vested awards outstanding at end of year | 169,202 |  |  | $ | 97.16 |  |  | 151,769 |  |  | $ | 89.72 |  |  | 107,229 |  |  | $ | 66.13 |
Time Based Restricted Stock |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of restricted stock and restricted stock activity |
| 2017 |  | 2016 |  | 2015
| Awards Outstanding |  | Weighted- Average Grant Date Fair Value |  | Awards Outstanding |  | Weighted- Average Grant Date Fair Value |  | Awards Outstanding |  | Weighted- Average Grant Date Fair Value
Non-vested awards outstanding at beginning of year | 239,189 |  |  | $ | 57.71 |  |  | 208,318 |  |  | $ | 64.27 |  |  | 238,386 |  |  | $ | 53.80 |
Awards granted | 80,535 |  |  | 83.17 |  |  | 118,660 |  |  | 51.70 |  |  | 75,160 |  |  | 77.15 |
Stock issued | (140,208 | ) |  | 58.18 |  |  | (60,326 | ) |  | 64.03 |  |  | (93,813 | ) |  | 48.35 |
Awards forfeited or expired | (6,185 | ) |  | 60.70 |  |  | (27,463 | ) |  | 64.60 |  |  | (11,415 | ) |  | 61.32 |
Non-vested awards outstanding at end of year | 173,331 |  |  | $ | 69.10 |  |  | 239,189 |  |  | $ | 57.71 |  |  | 208,318 |  |  | $ | 64.27 |
Deferred Stock Units |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of restricted stock and restricted stock activity |
| 2017 |  | 2016 |  | 2015
| 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 at beginning of year | 11,900 |  |  | $ | 58.82 |  |  | 23,950 |  |  | $ | 27.22 |  |  | 30,150 |  |  | $ | 24.43 |
Awards granted | 9,250 |  |  | 109.48 |  |  | 11,900 |  |  | 58.82 |  |  | 10,300 |  |  | 73.79 |
Stock issued | (11,900 | ) |  | 109.36 |  |  | (23,950 | ) |  | 52.69 |  |  | (16,500 | ) |  | 51.20 |
Awards outstanding at end of year | 9,250 |  |  | $ | 109.48 |  |  | 11,900 |  |  | $ | 58.82 |  |  | 23,950 |  |  | $ | 27.22 |

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