CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings
Balances at Dec. 31, 2017	$ 405,765	$ 271	$ 125,715	$ 279,779
Net loss	(22,272)			(22,272)
Stock granted under restricted stock plan, net		3	(3)
Stock based compensation	903		903
Shares surrendered by employees to pay taxes	(421)			(421)
Balances at Mar. 31, 2018	383,975	274	126,615	257,086
Balances at Dec. 31, 2018	336,283	277	132,080	203,926
Net loss	(19,994)			(19,994)
Shares sold under ATM program	3,375	9	3,366
Stock granted under restricted stock plan, net		4	(4)
Stock based compensation	710		710
Shares surrendered by employees to pay taxes	(278)			(278)
Balances at Mar. 31, 2019	$ 320,096	$ 290	$ 136,152	$ 183,654