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Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2017
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On February 13, 2018, the Company’s board of directors announced an increase in the Company’s quarterly dividend to $0.40 per common share from $0.35 per common share. The next quarterly cash dividend payment of $0.40 per common share is scheduled to be paid on March 15, 2018 to stockholders of record at the close of business on March 5, 2018.