Net Income (Loss) Per Common Share (Narrative) (Details) - USD ($)	2 Months Ended	12 Months Ended
	Feb. 28, 2020	Dec. 31, 2019	Feb. 11, 2020	Jul. 29, 2019
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, authorized amount				$ 50,000,000
Repurchases of common stock (in shares)		10,694,556
Repurchases of common stock		$ 43,985,000
Subsequent Event
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, authorized amount			$ 50,000,000
Repurchases of common stock (in shares)	8,100,000
Repurchases of common stock	$ 32,900,000