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Share-Based Compensation | 6 Months Ended
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Jun. 30, 2020
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Share-Based Compensation | 7. Share-Based Compensation The Company has share-based compensation plans, which are more fully described in Note 9, Share-Based Compensation, to the Consolidated Financial Statements included in the 2019 10-K. During the six months ended June 30, 2020, the Company granted restricted stock units subject to service conditions and restricted stock units subject to service and performance conditions. Share-based compensation expense amounted to $12.2 million and $9.9 million for the three months ended June 30, 2020 and 2019, respectively, and $22.5 million and $20.5 million for the six months ended June 30, 2020 and 2019, respectively. As of June 30, 2020, the total unrecognized compensation cost related to all non-vested stock awards was $86.6 million and the related weighted-average period over which it is expected to be recognized is approximately 1.9 years. The following table summarizes the activity for stock appreciation rights, or SARs, under all share-based compensation plans for the six months ended June 30, 2020:
|  | Number of Awards |  |  | Weighted-Average Exercise Price Per Award |  |  | Weighted-Average Remaining Contractual Term |  | Aggregate Intrinsic Value(1) |
|  | (in thousands) |  |  |  |  |  |  |  |  | (in millions) |
Outstanding as of December 31, 2019(2)(3) |  |  | 7,001 |  |  | $ | 27.85 |  |  | 5.4 years |  | $ | 138.7 |
Granted |  |  | — |  |  | $ | — |  |  |  |  |  |  |
Exercised |  |  | (1,228 | ) |  | $ | 31.32 |  |  |  |  |  |  |
Forfeited |  |  | (7 | ) |  | $ | 29.03 |  |  |  |  |  |  |
Outstanding as of June 30, 2020(2)(3) |  |  | 5,766 |  |  | $ | 27.11 |  |  | 4.8 years |  | $ | 103.0 |
Exercisable as of June 30, 2020(4) |  |  | 5,753 |  |  | $ | 27.10 |  |  | 4.8 years |  | $ | 102.9 |
Vested and expected to vest as of June 30, 2020 |  |  | 5,766 |  |  | $ | 27.11 |  |  | 4.8 years |  | $ | 103.0 |
(1) | The intrinsic value is the amount by which the current market value of the underlying stock exceeds the exercise price of the SARs.
(2) | Includes less than 0.1 million market condition SARs as of both June 30, 2020 and December 31, 2019.
(3) | Includes 2.1 million and 2.9 million performance condition SARs as of June 30, 2020 and December 31, 2019, respectively, which represents the maximum amount that can vest.
(4) | Includes less than 0.1 million market condition and 2.1 million performance condition SARs.
There were no SARs granted during the three and six months ended June 30, 2020 and 2019. The total intrinsic value of SARs exercised during the three months ended June 30, 2020 and 2019 was $10.1 million and $5.3 million, respectively. The total intrinsic value of SARs exercised during the six months ended June 30, 2020 and 2019 was $11.7 million and $17.2 million, respectively. The following table summarizes the activities for stock units under all share-based compensation plans for the six months ended June 30, 2020:
|  | Number of Shares |  |  | Weighted-Average Grant Date Fair Value Per Share |
|  | (in thousands) |  |  |  |  |
Outstanding and nonvested as of December 31, 2019(1) |  |  | 1,833 |  |  | $ | 49.49 |
Granted(2) |  |  | 1,893 |  |  | $ | 39.20 |
Vested |  |  | (317 | ) |  | $ | 49.36 |
Forfeited |  |  | (71 | ) |  | $ | 44.58 |
Outstanding and nonvested as of June 30, 2020(1) |  |  | 3,338 |  |  | $ | 43.77 |
Expected to vest as of June 30, 2020(3) |  |  | 2,822 |  |  | $ | 43.13 |
(1) | Includes 980,338 and 475,430 performance-based stock unit awards as of June 30, 2020 and December 31, 2019, respectively, which represents the maximum amount that can vest.
(2) | Includes 504,908 performance-based stock unit awards.
(3) | Includes 506,200 performance-based stock unit awards.
The total vesting date fair value of stock units which vested during the three months ended June 30, 2020 and 2019 was $1.4 million and $1.9 million, respectively. The total vesting date fair value of stock units which vested during the six months ended June 30, 2020 and 2019 was $11.0 million and $10.9 million, respectively.

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- Definition The entire disclosure for share-based payment arrangement. + 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 + Details
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