(Loss) Earnings per Share - Two Class Method (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
(Loss) Earnings per Share
Net (loss) income	$ (17,812)	$ 760
Less: Preferred dividends	4,694
Net (loss) income attributable to stockholders	(22,506)	760
Net (loss) income attributable to common stockholders	$ (22,506)	$ 760
Denominator:
Weighted average common shares outstanding (in shares)	12,428	8,825
(Loss) earnings per common share - basic and diluted under two class method (in dollars per share)	$ (1.81)	$ 0.09