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Equity - Share activity (Details) - shares shares in Thousands	12 Months Ended
	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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Number of shares issued during the period related to Restricted Stock Awards, net of any shares forfeited.

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