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Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Summary of Restricted Stock Award Activity for Employees and Non-Employee Directors | The following table summarizes our restricted stock award activity for employees and non-employee directors:
|  | Shares |  | Weighted Average Grant Date Fair Value Per Share
Unvested at January 1, 2019 |  |  | 91,181 |  |  | $ | 107.06 |
Granted |  |  | 75,048 |  |  |  | 144.89 |
Vested |  |  | (51,675 | ) |  |  | 98.11 |
Forfeited |  |  | (5,400 | ) |  |  | 133.91 |
Unvested at December 31, 2019 |  |  | 109,154 |  |  | $ | 135.97 |
Summary of the Changes in the Number of Outstanding Phantom Stock Shares | A summary of the changes in the number of outstanding phantom stock awards during the year ended December 31, 2019 for the Phantom Plans is provided below:
|  | Employee Phantom Plans |  | Director Phantom Stock Plan |  | Total
Balance of shares outstanding at December 31, 2018 |  |  | 466,387 |  |  |  | 54,071 |  |  |  | 520,458 |
Granted |  |  | — |  |  |  | — |  |  |  | — |
Settled |  |  | (41,217 | ) |  |  | — |  |  |  | (41,217 | )
Forfeited |  |  | — |  |  |  | — |  |  |  | — |
Balance of shares outstanding at December 31, 2019 |  |  | 425,170 |  |  |  | 54,071 |  |  |  | 479,241 |
Schedule of cash payments and compensation costs | A summary of cash payments for settled unmodified liability phantom shares is provided below:
|  | Year Ended December 31,
(In thousands) |  | 2019 |  | 2018 |  | 2017
Employee Phantom Plans |  | $ | 2,988 |  |  | $ | 2,360 |  |  | $ | 3,066 |
Director Phantom Stock Plan |  |  | 964 |  |  |  | 198 |  |  |  | 474 |

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- Definition Tabular disclosure of the amount of cash payments and compensation costs related to the exercise of stock options and similar instruments granted under share-based payment arrangements during the period. + References No definition available. + Details
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- Definition Tabular disclosure of share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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