Shareholders' Equity - Summary of Common Shares Outstanding (Details) - shares	3 Months Ended					9 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Roll forward of common shares outstanding
Balance at the beginning of the year		32,472,406			32,750,727	32,472,406	32,750,727
Repurchases	(122,000)	(220,731)	(106,760)	(148,466)	(31,500)	(342,731)	(286,726)
Restricted share issuances						138,276	137,888
Balance at the end of the period			32,601,889			32,267,951	32,601,889