Stockholders' Equity - Table of Share Repurchases (Details) - Common stock - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Jan. 24, 2019	Dec. 10, 2018
Number of shares purchased	1,472,730
Average price per share	$ 6.17
Remaining repurchase authorization	$ 19,277
Share Repurchase Program - December 2018 Program [Member]
Stock pepurchase program, authorized amount			$ 10,000
Block repurchase program
Stock pepurchase program, authorized amount		$ 10,000	$ 10,000
Number of shares purchased	1,412,309
Average price per share	$ 6.18
Remaining repurchase authorization	$ 10,000
Share repurchase program
Number of shares purchased	60,421
Average price per share	$ 5.86
Remaining repurchase authorization	$ 9,277