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Stock-Based Compensation Plans | 12 Months Ended
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Dec. 31, 2018
Share-based Compensation [Abstract] |
Stock-Based Compensation Plans | STOCK-BASED COMPENSATION PLANS Pursuant to our Amended and Restated Incentive Compensation Plan (the “Incentive Plan”), we can grant stock-based awards in the form of restricted stock, restricted stock units and stock options to team members, officers, directors, and contractors at any time prior to March 26, 2022. On March 26, 2012, our board of directors approved an amendment to our Incentive Plan, increasing the number of shares authorized for issuance by 500,000 shares, to 2.0 million shares. The shares available for future grants under the Incentive Plan totaled 126,348 as of December 31, 2018. Restricted Stock We grant performance-based and time-based shares of restricted stock to team members in accordance with our Incentive Plan. The grant-date fair value per share is estimated to equal the market price of our common stock on the date of grant. Based on the terms of individual restricted stock grant agreements, shares vest under one of the following methods:
• | Over a period of 15 years, based on continuous employment and a combination of the cumulative improvement in our annual adjusted economic profit, a non-GAAP financial measure, and the attainment of annual adjusted economic profit targets.
• | Over a period of three years, based on continuous employment.
A summary of the non-vested restricted stock activity under the Incentive Plan for the year ended December 31, 2018 is presented below:
Restricted Stock |  | Number of Shares |  | Weighted Average Grant-Date Fair Value Per Share
Non-vested as of December 31, 2017 |  | 159,300 |  |  | $ | 114.70 |
Granted |  | 4,718 |  |  | 317.87 |
Vested |  | (12,651 | ) |  | 151.61 |
Forfeited |  | (720 | ) |  | 230.20 |
Non-vested as of December 31, 2018 |  | 150,647 |  |  | $ | 117.41 |
The grant-date weighted average fair value of shares granted in 2018, 2017 and 2016 was $317.87, $200.79, and $196.96, respectively. The total fair value of shares vested was $4.8 million in 2018, $5.6 million in 2017 and $4.4 million in 2016. Restricted Stock Units We grant performance-based restricted stock units to team members and directors in accordance with our Incentive Plan. The grant-date fair value per share is estimated to equal the market price of our common stock on the date of grant. Each restricted stock unit represents and has a value equal to one share of common stock. Based on the terms of individual restricted stock grant agreements, restricted stock unit vest under one of the following methods:
• | Over a period of ten years, based on continuous employment and the cumulative improvement in our annual adjusted economic profit.
• | Over a period of five years, based upon the compounded annual growth rate in our adjusted economic profit.
• | Over a period of one to four years, based on continuous employment and the compounded annual growth rate in our adjusted EPS, a non-GAAP financial measure.
A summary of the restricted stock unit activity under the Incentive Plan for the year ended December 31, 2018, is presented below:
Restricted Stock Units |  | Number of Restricted Stock Units |  | Weighted Average Grant-Date Fair Value Per Share |  | Aggregate Intrinsic Value (2) (in millions) |  | Weighted Average Remaining Contractual Term (in years)
Outstanding as of December 31, 2017 |  | 522,827 |  |  | $ | 126.59 |  |  |  |  |
Granted |  | 4,235 |  |  | 363.11 |  |  |  |  |
Converted |  | (1,439 | ) |  | 159.08 |  |  |  |  |
Forfeited |  | (8,850 | ) |  | 206.45 |  |  |  |  |
Outstanding as of December 31, 2018 (1) |  | 516,773 |  |  | $ | 127.07 |  |  | $ | 197.3 |  |  | 4.3
Vested as of December 31, 2018 |  | 308,509 |  |  | $ | 114.92 |  |  | $ | 117.8 |  |  | 3.4
(1) | No RSUs outstanding at December 31, 2018 were convertible to shares of common stock.
(2) | The intrinsic value of RSUs is measured by applying the closing stock price as of December 31, 2018 to the applicable number of units.
The grant-date weighted average fair value of RSUs granted in 2018, 2017 and 2016 was $363.11, $206.45, and $181.04, respectively. The total intrinsic value of RSUs converted to common stock during 2018, 2017 and 2016 was $0.5 million, $6.9 million, and $78.7 million, respectively. Stock-based compensation expense Stock-based compensation expense consists of the following:
(In millions) | For the Years Ended December 31,
| 2018 |  | 2017 |  | 2016
Restricted stock | $ | 2.7 |  |  | $ | 2.9 |  |  | $ | 2.8 |
Restricted stock units | 7.6 |  |  | 12.5 |  |  | 4.6 |
Total | $ | 10.3 |  |  | $ | 15.4 |  |  | $ | 7.4 |
While the stock-based awards are often expected to vest in equal, annual installments over the corresponding requisite service periods of the grants, the related stock-based compensation expense is not recognized on a straight-line basis over the same periods. Each installment is accounted for as a separate award and as a result, the fair value of each installment is recognized as stock-based compensation expense on a straight-line basis over the related expected vesting period. Assuming performance targets are achieved in the periods currently estimated, we expect to recognize the remaining expense for stock-based awards outstanding as of December 31, 2018 over a weighted average period of 1.8 years, as follows:
(In millions) |  |  |  |  |  |
For the Years Ended December 31, |  | Restricted Stock Units |  | Restricted Stock |  | Total Projected Expense
2019 |  | $ | 4.6 |  |  | $ | 1.8 |  |  | $ | 6.4 |
2020 |  | 2.3 |  |  | 1.3 |  |  | 3.6 |
2021 |  | 0.5 |  |  | 0.9 |  |  | 1.4 |
2022 |  | 0.1 |  |  | 0.8 |  |  | 0.9 |
2023 |  | — |  |  | 0.7 |  |  | 0.7 |
Thereafter |  | — |  |  | 1.0 |  |  | 1.0 |
Total |  | $ | 7.5 |  |  | $ | 6.5 |  |  | $ | 14.0 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details
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