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Shareholders' Equity	3 Months Ended
Shareholders' Equity	Mar. 31, 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. We have approximately $25 million remaining on an existing share repurchase authorization announced in April 2018 that remains in place through the end of 2019. 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. We did not repurchase any shares during the three months ended March 31, 2019.