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Shareholders' Equity and Stock Options (Tables) | 12 Months Ended
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Dec. 31, 2015
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:
| December 31, 2015 |  | December 31, 2014
Stock acquisition program | 120,883 |  |  | 120,883 |
Stock options and restricted stock | 678,904 |  |  | 862,040 |
Shares available for issuance | 1,079,491 |  |  | 1,176,882 |
Rogers Employee Savings and Investment Plan | 169,044 |  |  | 169,044 |
Rogers Corporation Global Stock Ownership Plan for Employees | 153,357 |  |  | 166,152 |
Deferred compensation to be paid in stock | 13,239 |  |  | 13,248 |
Total | 2,214,918 |  |  | 2,508,249 |
Weighted average assumptions used to calculate fair value of options granted | .
Activity under our stock option plans | A summary of the activity under our stock option plans for the fiscal years ended 2015, 2014 and 2013, is presented below:
| 2015 |  | 2014 |  | 2013
| 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 | 393,347 |  |  | $ | 40.72 |  |  | 893,139 |  |  | $ | 43.23 |  |  | 1,765,947 |  |  | $ | 40.58 |
Options exercised | (178,759 | ) |  | 40.90 |  |  | (476,793 | ) |  | 44.60 |  |  | (847,340 | ) |  | 37.82 |
Options forfeited | (2,550 | ) |  | 40.09 |  |  | (22,999 | ) |  | 57.07 |  |  | (25,468 | ) |  | 39.04 |
Outstanding at year-end | 212,038 |  |  | 40.47 |  |  | 393,347 |  |  | 40.72 |  |  | 893,139 |  |  | 43.23 |
Options exercisable at year-end | 204,394 |  |  |  |  | 364,770 |  |  |  |  | 721,645 |  |  |
A summary of the activity under our stock option plans as of December 31, 2015 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, 2014 | 393,347 |  |  | $ | 40.72 |  |  | 3.8 |  | 16,019,130 |
Options exercised | (178,759 | ) |  | 40.90 |  |  |  |  |  |
Options forfeited | (2,550 | ) |  | 40.09 |  |  |  |  |  |
Options outstanding at December 31, 2015 | 212,038 |  |  | 40.47 |  |  | 3.2 |  | 2,557,193 |
Options exercisable at December 31, 2015 | 204,394 |  |  | 40.44 |  |  | 3.1 |  | 2,478,456 |
Options vested at December 31, 2015 or expected to vest* | 211,809 |  |  | 40.50 |  |  | 3.2 |  | 2,554,831 |
* In addition to the vested options, we expect a portion of the unvested options to vest at some point in the future. Options expected to vest are calculated by applying an estimated forfeiture rate to the unvested options.
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
| 2015 | 2014 |  |  | 2015 | 2014 |
Discount rate | 4.25 | % | 4.00 | % |  |  | 3.00 | % | 3.00 | % |
Weighted-average assumptions used to determine net benefit cost for the years ended:
| Pension Benefits |  | Retirement Health and Life Insurance Benefits
| 2015 | 2014 |  | 2015 | 2014 |
Discount rate | 4.00 | % | 4.75 | % |  | 3.00 | % | 3.25 | % |
Expected long-term rate of return on plan assets | 6.50 | % | 7.50 | % |  | — |  | — |  |
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:
| 2015 |  | 2014
Expected volatility | 28.2 | % |  | 33.7 | %
Expected term (in years) | 3 |  |  | 3 |
Risk-free interest rate | 0.96 | % |  | 0.67 | %
Schedule of restricted stock and restricted stock activity | A summary of activity under the performance-based restricted stock plans for the fiscal years ended 2015, 2014 and 2013 is presented below:
| 2015 |  | 2014 |  | 2013
| 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 | 92,437 |  |  | $ | 52.75 |  |  | 71,175 |  |  | $ | 47.49 |  |  | 73,458 |  |  | $ | 38.01 |
Awards granted | 51,475 |  |  | 78.01 |  |  | 51,850 |  |  | 58.61 |  |  | 47,625 |  |  | 47.10 |
Stock issued | (20,910 | ) |  | 41.27 |  |  | (14,383 | ) |  | 47.89 |  |  | (33,538 | ) |  | 27.43 |
Awards forfeited or expired | (15,773 | ) |  | 59.45 |  |  | (16,205 | ) |  | 52.71 |  |  | (16,370 | ) |  | 44.90 |
Non-vested awards outstanding at end of year | 107,229 |  |  | $ | 66.13 |  |  | 92,437 |  |  | $ | 52.75 |  |  | 71,175 |  |  | $ | 47.49 |
Time Based Restricted Stock |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of restricted stock and restricted stock activity |
| 2015 |  | 2014 |  | 2013
| 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 | 238,386 |  |  | $ | 53.80 |  |  | 231,026 |  |  | $ | 48.54 |  |  | 115,139 |  |  | $ | 43.27 |
Awards granted | 75,160 |  |  | 77.15 |  |  | 93,780 |  |  | 61.7 |  |  | 156,665 |  |  | 51.78 |
Stock issued | (93,813 | ) |  | 48.35 |  |  | (62,378 | ) |  | 47.19 |  |  | (12,436 | ) |  | 43.97 |
Awards forfeited or expired | (11,415 | ) |  | 61.32 |  |  | (24,042 | ) |  | 51.19 |  |  | (28,342 | ) |  | 47.07 |
Non-vested awards outstanding at end of year | 208,318 |  |  | $ | 64.27 |  |  | 238,386 |  |  | $ | 53.80 |  |  | 231,026 |  |  | $ | 48.54 |
Deferred Stock Units |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of restricted stock and restricted stock activity |
| 2015 |  | 2014 |  | 2013
| 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 | 30,150 |  |  | $ | 24.43 |  |  | 31,550 |  |  | $ | 26.77 |  |  | 30,150 |  |  | $ | 26.13 |
Awards granted | 10,300 |  |  | 73.79 |  |  | 14,700 |  |  | 58.45 |  |  | 16,800 |  |  | 41.67 |
Stock issued | (16,500 | ) |  | 51.20 |  |  | (16,100 | ) |  | 60.08 |  |  | (15,400 | ) |  | 41.77 |
Non-vested awards outstanding at end of year | 23,950 |  |  | $ | 27.22 |  |  | 30,150 |  |  | $ | 24.43 |  |  | 31,550 |  |  | $ | 26.77 |

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