Equity - Additional Information (Details) - USD ($)	Dec. 31, 2018	Aug. 01, 2017
Stockholders Equity Note [Abstract]
Common stock shares authorized amount		$ 200,000,000
Stock repurchased during period, Share	7,555,601
Stock repurchased during period, value	$ 105,383,000
Weighted average price	$ 13.95
Stock repurchase amount available for future repurchase	$ 94,617,000