Earnings Per Share (Details) - shares	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Reconciliation of number of shares used in calculation of basic and diluted earnings per share
Weighted average number of common shares outstanding	85,600,000	88,300,000
Effect of non-participatory equity compensation (in shares)	40,000	36,000
Weighted average number of common shares outstanding, including effect of dilutive securities	85,600,000	88,300,000