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QUARTERLY FINANCIAL SUMMARY (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ 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
QUARTERLY FINANCIAL SUMMARY (UNAUDITED)
Revenues	$ 27,187	$ 31,445	$ 36,781	$ 29,967	$ 17,768	$ 29,595	$ 43,362	$ 56,060	$ 125,380	$ 146,785
Gross profit (loss)	(512)	1,486	2,223	(132)	(3,101)	1,014	3,872	6,374	3,065	8,159
Operating (loss) profit	(12,181)	(2,612)	(5,736)	(4,537)	(6,689)	(1,831)	(516)	1,603	(25,066)	(7,433)
(Loss) income from continuing operations, net of tax	(12,358)	(750)	(6,083)	(4,811)	(6,928)	(2,049)	(688)	6,482	(24,002)	(3,183)
Net (loss) income	$ (12,409)	$ (783)	$ (6,116)	$ (4,838)	$ (6,981)	$ (2,207)	$ (780)	$ 6,327	$ (24,146)	$ (3,641)
(Loss) income from continuing operations per share:
Basic	$ (0.79)	$ (0.05)	$ (0.40)	$ (0.32)	$ (0.45)	$ (0.14)	$ (0.05)	$ 0.43	$ (1.55)	$ (0.21)
Diluted	(0.79)	(0.05)	(0.40)	(0.32)	(0.45)	(0.14)	(0.05)	0.43	(1.55)	(0.21)
Net (loss) income per share:
Basic	(0.79)	(0.05)	(0.40)	(0.32)	(0.46)	(0.15)	(0.05)	0.42	(1.56)	(0.24)
Diluted	$ (0.79)	$ (0.05)	$ (0.40)	$ (0.32)	$ (0.46)	$ (0.15)	$ (0.05)	$ 0.42	$ (1.56)	$ (0.24)

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