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Stock-Based Compensation | 6 Months Ended
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Jun. 30, 2016
Share-based Compensation [Abstract] |
Stock-Based Compensation | Stock-Based Compensation Equity Compensation Awards Stock Options Stock options have been granted under various equity compensation plans. The maximum contractual term for all options is normally ten years. We have no t granted any stock options since the first quarter of 2012. In most cases, we recognize expense using the straight-line method for stock option grants. The amount of stock-based compensation recognized during a period is based on the value of the portion of the awards that are ultimately expected to vest. Forfeitures are required to be estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates. The term “forfeitures” is distinct from “cancellations” or “expirations” and represents only the unvested portion of the surrendered option. We currently expect, based on historical analysis, an annual forfeiture rate of approximately 3%. The first quarter of 2016 was the final quarter in which we recognized stock based compensation expense related to previously issued stock option grants, and the amount of such expense was de minimis. For the three and six months ended June 30, 2015, we recognized approximately $0.1 million and $0.1 million of stock option compensation expense, respectively. A summary of the activity under our stock option plans as of June 30, 2016 and changes during the three and six months 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 March 31, 2016 | 198,366 |  |  | $ | 40.31 |  |  | 3.3 |  | $ | 3,934,582 |
Options exercised | (41,959 | ) |  | $ | 35.60 |  |  |  |  |  |
Options forfeited | (350 | ) |  | $ | 44.32 |  |  |  |  |  |
Options outstanding at June 30, 2016 | 156,057 |  |  | $ | 41.57 |  |  | 3.1 |  | $ | 3,085,731 |
Options exercisable at June 30, 2016 | 156,057 |  |  | $ | 41.57 |  |  | 3.1 |  | $ | 3,085,731 |
Options vested at June 30, 2016 | 156,057 |  |  | $ | 41.57 |  |  | 3.1 |  | $ | 3,085,731 |
| Options Outstanding |  | Weighted- Average Exercise Price Per Share
Options outstanding at December 31, 2015 | 212,038 |  |  | $ | 40.47 |
Options exercised | (55,631 | ) |  | $ | 36.99 |
Options forfeited | (350 | ) |  | $ | 44.32 |
Options outstanding at June 30, 2016 | 156,057 |  |  | $ | 41.57 |
During the six months ended June 30, 2016, the total intrinsic value of options exercised (i.e., the difference between the market price at time of exercise and the price paid by the individual to exercise the options) was $1.4 million, and the total amount of cash received from the exercise of these options was $2.1 million. Performance-Based Restricted Stock As of June 30, 2016, we had performance-based restricted stock awards from 2014, 2015 and 2016 outstanding. These awards cliff vest at the end of a specified three year measurement period. For the 2015 and 2016 grants, employees whose employment terminates during the measurement period due to death, disability, or, in certain cases, retirement may receive a pro-rata payout based on the number of days they were employed during the vesting period. Participants are eligible to be awarded shares ranging from 0% to 200% of the target award amount, based on certain defined measurement criteria. Compensation expense is recognized using the straight-line method over the vesting period. The outstanding awards from 2016 have one measurement criterion on which the final payout of each award is based - the three year total shareholder return (TSR) on the performance of our capital stock as compared to that of a specified group of peer companies. TSR is considered a market condition. As such, the fair value of all awards was determined on the date of grant using a Monte Carlo simulation valuation model with related compensation expense fixed on the grant date and expensed on a straight-line basis over the life of the awards that ultimately vest with no changes for the final projected payout of the award until payment is made. The amount of performance-based restricted stock compensation recognized during a period is based on the value of the portion of the awards that are ultimately expected to vest. Forfeitures are required to be estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates. We currently expect, based on historical analysis, an annual forfeiture rate of approximately 12%. This assumption is reviewed periodically and the rate is adjusted as necessary. Ultimately, the actual expense recognized over the vesting period will only be for those awards that vest. Below were the assumptions used in the Monte Carlo calculation:
|  | June 30, 2016 |  | June 30, 2015
Expected volatility |  | 29.6% |  | 28.2%
Expected term (in years) |  | 3.0 |  | 3.0
Risk-free interest rate |  | 0.93% |  | 0.96%
Expected volatility – In determining expected volatility, we have considered a number of factors, including historical volatility. Expected term – We use the vesting period of the award to determine the expected term assumption for the Monte Carlo simulation valuation model. Risk-free interest rate – We use an implied "spot rate" yield on U.S. Treasury Constant Maturity rates as of the grant date for our assumption of the risk-free interest rate. Expected dividend yield – We do not currently pay dividends on our capital stock; therefore, a dividend yield of 0% was used in the Monte Carlo simulation valuation model.
| Performance-Based Restricted Stock Awards
Non-vested awards outstanding at December 31, 2015 | 107,229 |
Awards granted | 81,220 |
Stock issued | (25,397 | )
Awards forfeited | (8,401 | )
Non-vested awards outstanding at June 30, 2016 | 154,651 |
During the three and six months ended June 30, 2016, we recognized compensation expense for performance-based restricted stock awards of approximately $1.4 million and $2.1 million, respectively. During the three and six months ended June 30, 2015, we recognized compensation expense for performance-based restricted stock awards of approximately $1.2 million and $1.6 million, respectively. Time-Based Restricted Stock As of June 30, 2016, we had time-based restricted stock grants from 2013, 2014, 2015 and 2016 outstanding. The grants typically vest on the first, second and third anniversaries of the original grant date. We recognize compensation expense on all of these awards on a straight-line basis over the vesting period. The fair value of the award is determined based on the market value of the underlying stock price at the grant date. The amount of time-based restricted stock compensation recognized during a period is based on the value of the portion of the awards that are ultimately expected to vest. Forfeitures are required to be estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates. We currently expect, based on historical analysis, an annual forfeiture rate of approximately 12%. This assumption is reviewed periodically and the rate is adjusted as necessary. Ultimately, the actual expense recognized over the vesting period will only be for those awards that vest.
| Time-Based Restricted Stock Awards
Non-vested awards outstanding at December 31, 2015 | 208,318 |
Awards granted | 117,510 |
Stock issued | (47,089 | )
Awards forfeited | (16,247 | )
Non-vested awards outstanding at June 30, 2016 | 262,492 |
During the three and six months ended June 30, 2016, we recognized compensation expense for time-based restricted stock awards of approximately $1.5 million and $2.7 million, respectively. During the three and six months ended June 30, 2015, we recognized compensation expense for time-based restricted stock awards of approximately $1.3 million and $2.4 million, respectively. Deferred Stock Units We grant deferred stock units to non-management directors. These awards are fully vested on the date of grant and the related shares are generally issued on the 13 month anniversary of the grant date unless the individual elects to defer the receipt of those shares. Each deferred stock unit results in the issuance of one share of Rogers’ stock. The grant of deferred stock units is typically done annually during the second quarter of each year. The fair value of the award is determined based on the market value of the underlying stock price at the grant date.
| Deferred Stock Units
Awards outstanding at December 31, 2015 | 23,950 |
Awards granted | 11,900 |
Stock issued | (20,000 | )
Awards outstanding at June 30, 2016 | 15,850 |
For both the three and six month periods ended June 30, 2016 and 2015 we recognized compensation expense for deferred stock units of $0.7 million and $0.7 million, respectively. Employee Stock Purchase Plan We have an employee stock purchase plan (ESPP) that allows eligible employees to purchase, through payroll deductions, shares of our capital stock at a discount to fair market value. The ESPP has two six month offering periods each year, the first beginning in January and ending in June and the second beginning in July and ending in December. The ESPP contains a look-back feature that allows the employee to acquire stock at a 15% discount from the underlying market price at the beginning or end of the applicable period, whichever is lower. We recognize compensation expense on this plan ratably over the offering period based on the fair value of the anticipated number of shares that will be issued at the end of each offering period. Compensation expense is adjusted at the end of each offering period for the actual number of shares issued. Fair value is determined based on two factors: (i) the 15% discount amount on the underlying stock’s market value on the first day of the applicable offering period and (ii) the fair value of the look-back feature determined by using the Black-Scholes model. We recognized approximately $0.1 million of compensation expense associated with the plan in each of the three months ended June 30, 2016 and 2015 and approximately $0.2 million of compensation expense associated with each of the six months ended June 30, 2016 and 2015.

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=65895303&loc=d3e17540-113929 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68057994&loc=d3e25284-112666 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901 + Details
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