Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Basic EPS:
Net Income (Loss)	$ 2,319	$ 16,241	$ 10,787	$ 33,951	$ 71,971
Income, share amounts	11,655	11,487	11,629	11,360
Earnings Per Share, Basic	$ 0.20	$ 1.41	$ 0.93	$ 2.99
Dilutive Securities:
Dilutive RSAs	0	0	0	0
Dilutive RSUs	16	59	17	73
Dilutive Stock Options	86	8	96	12
Diluted EPS:
Net Income (Loss) Available to Common Stockholders, Diluted	$ 2,319	$ 16,241	$ 10,787	$ 33,951
Weighted Average Number of Shares Outstanding, Diluted	11,757	11,554	11,742	11,445
Earnings Per Share, Diluted	$ 0.20	$ 1.41	$ 0.92	$ 2.97
Warrant [Member]
Earnings Per Share (Textual)
Antidilutive shares excluded from EPS, shares	4,300	4,300	4,300	4,300
Stock Options [Member]
Earnings Per Share (Textual)
Antidilutive shares excluded from EPS, shares	400	400	400	400
Restricted Stock Units (RSUs) [Member]
Earnings Per Share (Textual)
Antidilutive shares excluded from EPS, shares	100	100	100	100
Performance Shares [Member]
Earnings Per Share (Textual)
Antidilutive shares excluded from EPS, shares	100		100