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Shareholders' Equity	6 Months Ended
Shareholders' Equity	Jun. 30, 2019
Stockholders' Equity Note [Abstract]
Shareholders' Equity	Shareholders’ Equity Share repurchase programs In March 2019, our board of directors authorized an additional share repurchase program under which we may repurchase up to $200 million of our common stock through the end of 2020. During the second quarter of 2019 we repurchased approximately 1.8 million shares of our common stock at a weighted average cost per share of $13.79, which included commissions. These repurchases used the remaining $25 million of share repurchase authorization on the program announced in April 2018. Repurchases may be made from time to time on the open market or through privately negotiated transactions. The repurchase program may be suspended for periods or discontinued at any time.