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Stock-based Compensation | 6 Months Ended
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Jun. 30, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock-based Compensation | 7. STOCK-BASED COMPENSATION Stock Unit Awards Along with cash-based salaries and performance-based annual cash incentive awards, stock unit awards represent an important element of compensation to our employees. Restricted stock unit ("RSU") and performance stock unit ("PSU") awards activity is presented in the following tables.
| Shares (thousands) |  | Weighted Average Grant Date Fair Value | Weighted Average Remaining Contractual Life (in years)
Unvested as of March 31, 2019 | 527.0 |  |  | $ | 140.55 |  | 2.15
Granted | 204.3 |  |  | 150.03 |  |
Vested | (26.6 | ) |  | 118.02 |  |
Forfeited | (8.4 | ) |  | 136.19 |  |
Unvested as of June 30, 2019 | 696.3 |  |  | $ | 144.17 |  | 2.25
Unvested as of March 31, 2018 | 658.0 |  |  | $ | 126.31 |  | 2.20
Granted | 100.7 |  |  | 164.04 |  |
Vested | (4.3 | ) |  | 172.95 |  |
Forfeited | (4.1 | ) |  | 129.03 |  |
Unvested as of June 30, 2018 | 750.3 |  |  | $ | 131.09 |  | 2.36
| Shares (thousands) |  | Weighted Average Grant Date Fair Value | Weighted Average Remaining Contractual Life (in years)
Unvested as of December 31, 2018 | 652.7 |  |  | $ | 131.32 |  | 2.02
Granted | 279.0 |  |  | 150.78 |  |
Vested | (222.1 | ) |  | 115.17 |  |
Forfeited | (13.3 | ) |  | 132.56 |  |
Unvested as of June 30, 2019 | 696.3 |  |  | $ | 144.17 |  | 2.25
Unvested as of December 31, 2017 | 727.7 |  |  | $ | 118.96 |  | 1.24
Granted | 220.0 |  |  | 162.33 |  |
Vested | (178.1 | ) |  | 122.42 |  |
Forfeited | (19.3 | ) |  | 125.56 |  |
Unvested as of June 30, 2018 | 750.3 |  |  | $ | 131.09 |  | 2.36
We determine the fair value of RSUs, subject only to service requirements, based on the closing market price of our common stock on the grant date. PSUs are subject to service requirements and one or more performance measures, including (i) performance conditions (e.g. achievement against earnings per share targets) and (ii) for certain awards, a market condition (e.g. total shareholder return performance against a peer group). We determine the fair value of PSUs based on the closing market price of our common stock on the grant date taking into consideration the likelihood of achieving each performance condition and the market condition valuation, as applicable, based on the output of Monte Carlo simulations. As of June 30, 2019, we had $57.5 million of unamortized deferred compensation related to unvested restricted stock units, which we anticipate recognizing over varying periods into 2023.

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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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