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Subsequent Events	3 Months Ended
Subsequent Events	Mar. 31, 2019
Subsequent Events
Subsequent Events	17. Subsequent Events: On April 30, 2019, the company announced that the Board of Directors approved a quarterly dividend of $1.62 per common share. The dividend is payable June 10, 2019 to shareholders of record on May 10, 2019. The dividend declaration represents an increase of $0.05 per common share, which is 3 percent higher than the prior quarterly dividend of $1.57 per common share.