Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Basic EPS:
Net Income (Loss)	$ 8,466	$ 17,710	$ 71,971
Income, share amounts	11,602	11,232
Earnings Per Share, Basic	$ 0.73	$ 1.58
Dilutive Securities:
Dilutive RSAs	0	0
Dilutive RSUs	18	76
Dilutive Stock Options	107	15
Diluted EPS:
Net Income (Loss) Available to Common Stockholders, Diluted	$ 8,466	$ 17,710
Weighted Average Number of Shares Outstanding, Diluted	11,727	11,323
Earnings Per Share, Diluted	$ 0.72	$ 1.57
Stock Options [Member]
Earnings Per Share (Textual)
Antidilutive shares excluded from EPS, shares	400	400
Restricted Stock Units (RSUs) [Member]
Earnings Per Share (Textual)
Antidilutive shares excluded from EPS, shares	0	100
Performance Shares [Member]
Earnings Per Share (Textual)
Antidilutive shares excluded from EPS, shares	100
Warrant [Member]
Earnings Per Share (Textual)
Antidilutive shares excluded from EPS, shares	4,300	4,300