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Stock-Based Compensation | 3 Months Ended
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Apr. 02, 2017
Stock-Based Compensation |
Stock-Based Compensation | 8. Stock‑Based Compensation The Company maintains one stock incentive plan, the Second Amended and Restated 2004 Stock Incentive Plan (the “2004 Stock Incentive Plan”). The Company grants shares of restricted stock and deferred shares to key employees and stock awards to non‑employee members of the Company’s Board of Directors under the 2004 Stock Incentive Plan. Stock awards to non‑employee members of the Company’s Board of Directors vest immediately. Employees’ restricted stock awards and deferred shares typically vest over a three‑year period at the rate of one‑third per year. The restricted stock awards and deferred shares are amortized to expense on a straight-line basis over the vesting period. The Company issued 115,408 and 110,295 shares of restricted stock awards and deferred shares in the first three months of 2017 and 2016, respectively, related to the Company’s annual grant. The Company also grants performance stock units to key employees under the 2004 Stock Incentive Plan. Performance stock units cliff vest at the end of a performance period set by the Compensation Committee of the Board of Directors at the time of grant. Upon vesting, the number of shares of the Company’s Class A common stock awarded to each performance stock unit recipient will be determined based on the Company’s performance relative to certain performance goals set at the time the performance stock units were granted. The recipient of a performance stock unit award may earn from zero shares to twice the number of target shares awarded to such recipient. The performance stock units are amortized to expense over the vesting period, and based on the Company’s performance relative to the performance goals, may be adjusted. Changes to the estimated shares expected to vest will result in adjustments to the related share-based compensation expense that will be recorded in the period of change. If the performance goals are not met, no awards are earned and previously recognized compensation expense is reversed. The Company granted 98,812 and 106,724 of annual awards for performance stock units in the first three months of 2017 and 2016, respectively. The performance goals for the performance stock units are based on the compound annual growth rate of the Company’s revenue over the three-year performance period and the Company’s return on invested capital (“ROIC”) for the third year of the performance period. The Company also has a Management Stock Purchase Plan that allows for the granting of restricted stock units (RSUs) to key employees. On an annual basis, key employees may elect to receive a portion of their annual incentive compensation in RSUs instead of cash. Each RSU provides the key employee with the right to purchase a share of Class A common stock at 80% of the fair market value on the date of grant. Beginning with annual incentive compensation for 2016, the purchase price for RSUs was increased from 67% to 80% of the fair market value of the Company’s Class A common stock. RSUs vest either annually over a three-year period from the grant date or upon the third anniversary of the grant date and receipt of the shares underlying RSUs is deferred for a minimum of three years, or such greater number of years as is chosen by the employee, from the date of grant. An aggregate of 2,000,000 shares of Class A common stock may be issued under the Management Stock Purchase Plan. The company granted 47,222 RSU’s and 88,882 RSU’s in the first three months of 2017 and 2016, respectively. The fair value of each RSU issued under the Management Stock Purchase Plan is estimated on the date of grant, using the Black‑Scholes‑Merton Model, based on the following weighted average assumptions:
|  | 2017 |  | 2016 |
Expected life (years) |  | 3.0 |  | 3.0 |
Expected stock price volatility |  | 25.0 | % | 24.8 | %
Expected dividend yield |  | 1.2 | % | 1.3 | %
Risk-free interest rate |  | 1.5 | % | 0.9 | %
The risk‑free interest rate is based upon the U.S. Treasury yield curve at the time of grant for the respective expected life of the RSUs. The expected life (estimated period of time outstanding) of RSUs and volatility were calculated using historical data. The expected dividend yield of stock is the Company’s best estimate of the expected future dividend yield. The above assumptions were used to determine the weighted average grant‑date fair value of RSUs granted of $16.84 and $18.15 in 2017 and 2016, respectively. A more detailed description of each of these plans can be found in Note 12 of the Notes to Consolidated Financial Statements in the Company’s Annual Report on Form 10-K for the year ended December 31, 2016.

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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=6418621&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=51659978&loc=d3e25284-112666 Reference 3: 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 4: 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 5: 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 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 + Details
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