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Stockholders’ Equity (Tables) | 12 Months Ended
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Dec. 31, 2021
Equity [Abstract] |
Treasury Stock Acquisition | Treasury stock acquisitions during the years ended December 31, 2021, 2020 and 2019 were as follows (dollars in thousands):
|  | 2021 |  |  | 2020 |  |  | 2019 |
|  | Shares |  |  | Cost |  |  | Shares |  |  | Cost |  |  | Shares |  |  | Cost |
Treasury shares at beginning of period |  |  | 83,402,322 |  |  | $ | 1,366,313 |  |  |  | 77,336,387 |  |  | $ | 1,345,134 |  |  |  | 53,701,096 |  |  | $ | 1,080,448 |
Purchases pursuant to stock buyback program |  |  | — |  |  |  | — |  |  |  | 5,826,266 |  |  |  | 20,000 |  |  |  | 22,566,331 |  |  |  | 250,109 |
Acquisitions pursuant to long-term incentive plan |  |  | 451,196 |  |  |  | 3,727 |  |  |  | 239,669 |  |  |  | 1,179 |  |  |  | 1,037,947 |  |  |  | 14,205 |
Purchases in connection with Pioneer acquisition |  |  | 275,477 |  |  |  | 2,601 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Other |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 31,013 |  |  |  | 372 |
Treasury shares at end of period |  |  | 84,128,995 |  |  | $ | 1,372,641 |  |  |  | 83,402,322 |  |  | $ | 1,366,313 |  |  |  | 77,336,387 |  |  | $ | 1,345,134 |

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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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