Earning Per Common Share - Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Numerator for basic and diluted earnings per common share:
Net income (loss)	$ 26,250	$ 3,064	$ 9,564	$ 3,690	$ (41,152)	$ 6,408	$ 5,434	$ (1,858)	$ 42,568	$ (31,168)
Denominator:
Weighted average shares outstanding (shares)									10,410	10,362
Denominator for basic earnings per common share (shares)									10,410	10,362
Effect of dilutive securities:
Other stock compensation plans (shares)									234	0
Dilutive potential common shares (shares)									234	0
Denominator for diluted earnings per common share - adjusted weighted average shares outstanding and assumed conversions (shares)									10,644	10,362
Basic (loss) earnings per common share (usd per share)	$ 2.52	$ 0.29	$ 0.92	$ 0.36	$ (3.97)	$ 0.62	$ 0.52	$ (0.18)	$ 4.09	$ (3.01)
Diluted (loss) earnings per common share (usd per share)	$ 2.46	$ 0.29	$ 0.90	$ 0.35	$ (3.97)	$ 0.61	$ 0.52	$ (0.18)	$ 4.00	$ (3.01)
Anti-dilutive share, shares										117