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Per Share Amounts (Details) - shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Earnings per share [abstract]    
Weighted-average number of shares outstanding (in shares) 72,205,369 72,205,369
Diluted weighted-average number of shares outstanding (in shares) 72,631,320  
Antidilutive securities excluded from EPS calculation (in shares) 1,640,000 4,576,100