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Subsequent Events	3 Months Ended
Subsequent Events	Mar. 31, 2018
Subsequent Events
Subsequent Events	16. Subsequent Events: On April 24, 2018, the company announced that the Board of Directors approved a quarterly dividend of $1.57 per common share. The dividend is payable June 9, 2018 to shareholders of record on May 10, 2018. The dividend declaration represents an increase of $0.07 per common share, which is 5 percent higher than the prior quarterly dividend of $1.50 per common share.