Equity - Additional Information (Details) - USD ($)	1 Months Ended	3 Months Ended		9 Months Ended		10 Months Ended	12 Months Ended	27 Months Ended
	Oct. 31, 2019	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Oct. 31, 2019	Dec. 31, 2018	Oct. 31, 2019	Nov. 05, 2019	Aug. 01, 2017
Class of Stock [Line Items]
Common stock shares authorized amount										$ 200,000,000
Stock repurchased				6,726,203			7,555,601
Stock repurchased, value		$ 82,517,000	$ 3,569,000	$ 89,005,000	$ 3,569,000		$ 105,383,000
Stock repurchased, price per share				$ 13.23			$ 13.95
Subsequent Event [Member]
Class of Stock [Line Items]
Common stock shares authorized amount									$ 200,000,000
Stock repurchased	432,601					7,158,804		14,714,405
Stock repurchased, value	$ 5,612,000					$ 94,617,000		$ 200,000,000
Stock repurchased, price per share	$ 12.97					$ 13.22		$ 13.59