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Equity - Share activity (Details) - shares shares in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Increase (decrease) in common stock, number of shares |  |  |
Balance at beginning of period (in shares) | 66,818 | 66,526 | 71,996
Stock options exercised | 124 | 182 | 209
Purchase/acquisition of treasury stock (in shares) | 0 |  |
Purchase/acquisition of treasury stock (in shares) |  |  | (5,847)
Balance at end of period (in shares) | 67,016 | 66,818 | 66,526
Restricted stock units (RSUs) | Employee |  |  |
Increase (decrease) in common stock, number of shares |  |  |
Issuance of share-based awards (in shares) | 69 | 105 | 100
Performance shares and other share-based awards |  |  |
Increase (decrease) in common stock, number of shares |  |  |
Issuance of share-based awards (in shares) | 5 | 5 | 68
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) | 10,993 | 11,285 | 5,815
Stock options exercised | (124) | (182) | (209)
Purchase/acquisition of treasury stock (in shares) |  |  | 5,847
Balance at end of period (in shares) | 10,795 | 10,993 | 11,285
Treasury Stock | Restricted stock units (RSUs) | Employee |  |  |
Increase (decrease) in common stock, number of shares |  |  |
Issuance of share-based awards (in shares) | (69) | (105) | (100)
Treasury Stock | Performance shares and other share-based awards |  |  |
Increase (decrease) in common stock, number of shares |  |  |
Issuance of share-based awards (in shares) | (5) | (5) | (68)

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