Common Stock Repurchase Programs - Additional Information (Details) - USD ($)	1 Months Ended		3 Months Ended
	Apr. 30, 2018	Apr. 30, 2017	Mar. 31, 2018
Share Repurchase Program ("2017 Program")
Common Stock Repurchases [Line Items]
Stock repurchase program duration		1 year
Share repurchase program, beginning date		May 05, 2017
Number of shares repurchased			0
Remaining amount available for future share repurchases			$ 50,000,000
Share Repurchase Program ("2018 Program") | Subsequent Event
Common Stock Repurchases [Line Items]
Stock repurchase program duration	1 year
Share repurchase program, beginning date	2018-05
Share repurchase program, end date	2019-05
Maximum | Share Repurchase Program ("2017 Program")
Common Stock Repurchases [Line Items]
Repurchase of authorized common stock		$ 50,000,000
Maximum | Share Repurchase Program ("2018 Program") | Subsequent Event
Common Stock Repurchases [Line Items]
Repurchase of authorized common stock	$ 100,000,000