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Capital Stock, Weighted Average Shares Outstanding (Details) - shares
shares in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Weighted Average Shares Outstanding [Abstract]      
Basic weighted-average common shares outstanding (in shares) 55,170 52,806 55,412
Effect of Dilutive Securities [Abstract]      
Stock awards and options (in shares) 1,061 1,110 683
Convertible note (in shares) 245 936 2
Diluted weighted-average common shares outstanding (in shares) 56,476 54,852 56,097
Stock Options [Member]      
Weighted Average Shares Outstanding [Abstract]      
Anti-dilutive shares excluded from calculation of diluted earnings per share (in shares) 900 400 2,000