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Per Share Amounts	12 Months Ended
Per Share Amounts	Dec. 31, 2018
Earnings per share [abstract]
Per Share Amounts	PER SHARE AMOUNTS The basic and diluted weighted-average number of common shares outstanding for the year ended December 31, 2018 was 72,205,369 and 72,631,320, respectively (2017 - basic and diluted: 72,205,369). These outstanding share amounts were used to calculate net earnings (loss) per share in the respective periods. In determining diluted net earnings (loss) per share, the Company assumes that the proceeds received from the exercise of “in-the-money” stock options are used to repurchase common shares at the average market price. In calculating the weighted-average number of diluted common shares outstanding for the year ended December 31, 2018, the Company excluded 1,640,000 stock options (2017 – 4,576,100) as their exercise price was greater than the average common share market price in the year.