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Shareholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2021
Stockholders' Equity Note [Abstract] |
Rollforward of Common Stock Issued and Outstanding | The following table is a summary of changes in common shares issued and outstanding:
| Year ended December 31, | 2021 |  | 2020 |  | 2019 |
| (thousands of shares) |  |  |  |  |  |
| Beginning balance | 50,811 |  |  | 44,148 |  |  | 42,207 |  |
| Issuance of shares | — |  |  | 6,777 |  |  | 1,739 |  |
| Repurchase of shares | (6,579) |  |  | (406) |  |  | — |  |
| Exercise of options and issuance of restricted stock awards | 213 |  |  | 292 |  |  | 202 |  |
| Ending balance | 44,445 |  |  | 50,811 |  |  | 44,148 |  |

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