Annual report pursuant to Section 13 and 15(d)

INCOME (LOSS) PER COMMON SHARE - Computation of Basic and Diluted Earnings Per Share (Details)

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INCOME (LOSS) PER COMMON SHARE - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Earnings Per Share [Abstract]                      
Net income (loss) $ (4,682) $ (10,949) $ 549 $ (5,296) $ (24,279) $ (3,110) $ (10,923) $ (6,454) $ (20,378) $ (44,766) $ 3,515
Less: distributed and undistributed income (loss) from unvested restricted stock                 0 3 30
Net income (loss) attributable to common shareholders                 $ (20,378) $ (44,769) $ 3,485
Weighted average shares                 15,032 14,838 14,631
Basic and fully diluted earnings (loss) per share—common shareholders (in dollars per share) $ (0.31) $ (0.73) $ 0.04 $ (0.36) $ (1.63) $ (0.21) $ (0.73) $ (0.45) $ (1.36) $ (3.02) $ 0.24