Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share [Abstract]
Dividend rate (as percent)	5.00%
Reconciliation of basic and diluted earnings per share (EPS)
Net (loss) income	$ (13,527)	$ 32,629
Less: Preferred stock dividend	122	0
(Loss) income attributable to common stockholders	$ (13,649)	$ 32,629
Basic earnings (loss) per common share
Weighted-average common shares outstanding (in shares)	6,268	6,213
Basic (loss) income per common share (in dollars per share)	$ (2.18)	$ 5.24
Diluted Earnings (Loss) per Common Share
Weighted-average shares used to compute earnings/(loss) per share attributable to common shares (in shares)	6,268	6,990
Diluted (loss) income per common share (in dollars per share)	$ (2.18)	$ 4.67
Computation of Shares Used in Diluted Earnings (Loss) Per Common Share
Weighted-average common shares outstanding (in shares)	6,268	6,213
Weighted-average shares used to compute earnings/(loss) per share attributable to common shares (in shares)	6,268	6,990
Stock Options
Stock-based compensation arrangement by stock-based payment award
Weighted-average anti-dilutive shares have been excluded from the EPS calculations (in shares)	100	300
Unvested Shares
Stock-based compensation arrangement by stock-based payment award
Weighted-average anti-dilutive shares have been excluded from the EPS calculations (in shares)	100	200
Preferred Stock
Stock-based compensation arrangement by stock-based payment award
Weighted-average anti-dilutive shares have been excluded from the EPS calculations (in shares)	1,000