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Equity - Share activity (Details) - shares shares in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Increase (decrease) in common stock, number of shares |  |  |
Balance at beginning of period (in shares) | 71,996 | 72,414 | 71,616
Stock options exercised | 209 | 443 | 636
Purchase/acquisition of treasury stock (in shares) | (5,847) | (1,039) | (2)
Balance at end of period (in shares) | 66,526 | 71,996 | 72,414
Restricted Stock Units (RSUs) |  |  |
Increase (decrease) in common stock, number of shares |  |  |
Issuance of share-based awards (in shares) | 100 | 103 | 94
Performance shares and other share-based awards |  |  |
Increase (decrease) in common stock, number of shares |  |  |
Issuance of share-based awards (in shares) | 68 | 75 | 70
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) | 5,815 | 5,397 | 6,195
Stock options exercised | (209) | (443) | (636)
Purchase/acquisition of treasury stock (in shares) | 5,847 | 1,039 | 2
Balance at end of period (in shares) | 11,285 | 5,815 | 5,397
Treasury Stock | Restricted Stock Units (RSUs) |  |  |
Increase (decrease) in common stock, number of shares |  |  |
Issuance of share-based awards (in shares) | (100) | (103) | (94)
Treasury Stock | Performance shares and other share-based awards |  |  |
Increase (decrease) in common stock, number of shares |  |  |
Issuance of share-based awards (in shares) | (68) | (75) | (70)

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