Loss Per Share - Two Class Method (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Loss Per Share
Net loss	$ (123,766)	$ (2,458)
Less: preferred dividends	(6,144)	(5,480)
Net loss attributable to common stockholders	$ (129,910)	$ (7,938)
Denominator:
Weighted average common shares outstanding (in shares)	21,569	13,313
Loss per common share - basic and diluted under two-class method (in dollars per share)	$ (6.02)	$ (0.60)