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Equity - Share activity (Details) - shares shares in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Increase (decrease) in common stock, number of shares |  |  |
Balance at beginning of period (in shares) | 67,016 | 66,818 | 66,526
Stock options exercised | 331 | 124 | 182
Purchase/acquisition of treasury stock (in shares) | (765) |  |
Balance at end of period (in shares) | 66,657 | 67,016 | 66,818
RSU | Employee |  |  |
Increase (decrease) in common stock, number of shares |  |  |
Issuance of share-based awards (in shares) | 69 | 69 | 105
Performance shares and other share-based awards |  |  |
Increase (decrease) in common stock, number of shares |  |  |
Issuance of share-based awards (in shares) | 6 | 5 | 5
Common Stock |  |  |
Increase (decrease) in common stock, number of shares |  |  |
Balance at beginning of period (in shares) | 77,811 | 77,811 | 77,811
Balance at end of period (in shares) | 77,811 | 77,811 | 77,811
Treasury Stock |  |  |
Increase (decrease) in common stock, number of shares |  |  |
Balance at beginning of period (in shares) | 10,795 | 10,993 | 11,285
Stock options exercised | (331) | (124) | (182)
Purchase/acquisition of treasury stock (in shares) | 765 |  |
Balance at end of period (in shares) | 11,154 | 10,795 | 10,993
Treasury Stock | RSU | Employee |  |  |
Increase (decrease) in common stock, number of shares |  |  |
Issuance of share-based awards (in shares) | (69) | (69) | (105)
Treasury Stock | Performance shares and other share-based awards |  |  |
Increase (decrease) in common stock, number of shares |  |  |
Issuance of share-based awards (in shares) | (6) | (5) | (5)

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