NET INCOME PER COMMON SHARE Net Income Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share [Abstract]
Net Income (Loss) Available to Common Stockholders, Basic	$ 7,338	$ 12,557	$ 28,066	$ 36,038
Weighted Average Number of Shares Outstanding, Basic	11,258	11,209	11,244	11,437
Earnings Per Share, Basic	$ 0.65	$ 1.12	$ 2.50	$ 3.15
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	18	23	25	26
Net Income (Loss) Available to Common Stockholders, Diluted	$ 7,338	$ 12,557	$ 28,066	$ 36,038
Weighted Average Number of Shares Outstanding, Diluted	11,276	11,232	11,269	11,463
Earnings Per Share, Diluted	$ 0.65	$ 1.12	$ 2.49	$ 3.14