Share Repurchase Plan (Details) - USD ($)	5 Months Ended	12 Months Ended		17 Months Ended
	Feb. 28, 2020	Dec. 31, 2019	Dec. 31, 2018	Aug. 31, 2019	Sep. 16, 2019	Mar. 19, 2018
Equity, Class of Treasury Stock [Line Items]
Cost to repurchase common shares		$ 18,222,000	$ 12,256,000
March 19, 2018 Plan
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, authorized amount						$ 50,000,000
Repurchased common shares (in shares)				792,439
Cost to repurchase common shares				$ 30,500,000
Cost to repurchase common shares (in dollars per share)				$ 38.46
September 16, 2019 Plan
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, authorized amount					$ 50,000,000
Subsequent Event | September 16, 2019 Plan
Equity, Class of Treasury Stock [Line Items]
Repurchased common shares (in shares)	0