Earnings Per Share - (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Reconciliation of number of shares used in calculation of basic and diluted earnings per share
Weighted average number of common shares outstanding	80,421,478	82,872,330	80,731,889	83,625,142
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	80,461,478	82,912,330	80,771,889	83,665,142