Earnings Per Share - (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Reconciliation of number of shares used in calculation of basic and diluted earnings per share
Weighted average number of common shares outstanding	80,340,076	81,643,175	80,368,589	82,968,130
Effect of non-participatory equity compensation (in shares)	40,000	40,000	40,000	40,000
Weighted average number of common shares outstanding, including effect of dilutive securities	80,380,076	81,683,175	80,408,589	83,008,130