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Shareholders' Equity Share repurchase (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2019
$ / shares
shares
Jun. 30, 2019
$ / shares
shares
Equity [Abstract]    
Treasury Stock, Shares, Acquired 624,158 624,158
Treasury Stock Acquired, Average Cost Per Share | $ / shares $ 35.03 $ 35.03
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased 2,275,842 2,275,842