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Equity - Share activity (Details) - shares shares in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Increase (decrease) in common stock, number of shares |  |  |
Balance at beginning of period (in shares) | 66,526 | 71,996 | 72,414
Stock options exercised | 182 | 209 | 443
Purchase/acquisition of treasury stock (in shares) |  | (5,847) | (1,039)
Balance at end of period (in shares) | 66,818 | 66,526 | 71,996
Restricted stock units (RSUs) |  |  |
Increase (decrease) in common stock, number of shares |  |  |
Issuance of share-based awards (in shares) | 105 | 100 | 103
Performance shares and other share-based awards |  |  |
Increase (decrease) in common stock, number of shares |  |  |
Issuance of share-based awards (in shares) | 5 | 68 | 75
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) | 11,285 | 5,815 | 5,397
Stock options exercised | (182) | (209) | (443)
Purchase/acquisition of treasury stock (in shares) |  | 5,847 | 1,039
Balance at end of period (in shares) | 10,993 | 11,285 | 5,815
Treasury Stock | Restricted stock units (RSUs) |  |  |
Increase (decrease) in common stock, number of shares |  |  |
Issuance of share-based awards (in shares) | (105) | (100) | (103)
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) | (68) | (75)

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