Earnings (Loss) Per Share (Details 1) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share [Abstract]
Preferred stock dividend rate (as percent)									500.00%
Numerator:
Net income (loss)	$ 1,639	$ (9,984)	$ (6,734)	$ 32,629	$ (29,341)	$ (2,480)	$ (2,653)	$ (7,386)	$ 17,550	$ (41,860)
Less: Preferred stock dividend									457	0
Less: Earnings attributable to participating securities									2,202	0
Net Income (loss) attributable to common stockholders									14,891	(41,860)
Effect of dilutive securities:
Add back: Allocation of earnings to participating securities									2,202	0
Less: Re-allocation of earnings to participating securities considering potentially dilutive securities									(2,191)	0
Numerator for diluted EPS									$ 14,902	$ (41,860)
Denominator:
Basic EPS denominator: weighted-average common shares outstanding (in shares)									6,237	6,192
Effect of dilutive securities:
Unvested shares (in shares)									33	0
Diluted EPS denominator (in shares)									6,270	6,192
Basic earnings (loss) per common share (in dollars per share)	$ 0.21	$ (1.62)	$ (1.10)	$ 5.24	$ (4.73)	$ (0.40)	$ (0.43)	$ (1.20)	$ 2.39	$ (6.76)
Diluted earnings (loss) per common share (in dollars per share)	$ 0.21	$ (1.62)	$ (1.10)	$ 4.67	$ (4.73)	$ (0.40)	$ (0.43)	$ (1.20)	$ 2.38	$ (6.76)
Stock Options
Stock-based compensation
Weighted-average anti-dilutive shares have been excluded from the EPS calculations (in shares)									200	300
Unvested Shares
Stock-based compensation
Weighted-average anti-dilutive shares have been excluded from the EPS calculations (in shares)									100	100