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Earnings Per Share Earnings Per Share (Details) - shares
shares in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Earnings Per Share [Abstract]        
Incremental Common Shares Attributable to Dilutive Effect of Contingently Issuable Shares 267 231 267 231