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Common Stock and Treasury Stock (Tables) | 12 Months Ended
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Dec. 31, 2020
Equity [Abstract] |
Summary of Treasury Shares Issued by Award Type | Treasury shares issued by award type are as follows:
| Years Ended December 31,
| 2020 |  | 2019 |  | 2018
Stock options | 1,756,471 |  |  | 854,524 |  |  | 1,379,704 |
LTIP performance shares | 668,240 |  |  | — |  |  | — |
TSRs | 199,413 |  |  | — |  |  | — |
RSUs | 431,504 |  |  | 259,634 |  |  | 10,000 |
ESPP | 151,542 |  |  | 126,983 |  | 148,520
Total treasury shares issued | 3,207,170 |  |  | 1,241,141 |  |  | 1,538,224 |

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- Definition Tabular disclosure of treasury stock, including, but not limited to, average cost per share, description of share repurchase program, shares repurchased, shares held for each class of treasury stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23309-112656 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23315-112656 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23285-112656 + Details
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