Equity and Dividends (Tables)

9 Months Ended

Sep. 30, 2018

Equity and Dividends [Abstract]

Schedule of Quarterly Dividends Declared and Paid

	Declaration date	Dividend per share		Record date		Total dividends	Payment date
Nine months ended September 30, 2018:
Fourth quarter 2017	January 26, 2018	$	0.1700	February 16, 2018	$	18,246	March 9, 2018
First quarter 2018	May 9, 2018		0.1700	May 30, 2018		18,342	June 20, 2018
Second quarter 2018	August 7, 2018		0.1800	August 29, 2018		19,528	September 19, 2018
Nine months ended September 30, 2017:
Fourth quarter 2016	January 23, 2017	$	0.1700	February 10, 2017	$	18,160	March 3, 2017
First quarter 2017	May 4, 2017		0.1700	May 23, 2017		18,188	June 13, 2017
Second quarter 2017	August 4, 2017		0.1700	August 25, 2017		18,210	September 15, 2017