QUARTERLY DATA (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 713,044	$ 893,366	$ 936,228	$ 732,499	$ 845,024	$ 851,465	$ 858,480	$ 846,667	$ 3,275,137	$ 3,401,636	$ 3,509,656
Cost of revenues	522,965	634,646	652,688	546,507	610,720	598,407	606,950	625,719	2,356,806	2,441,796	2,542,633
Income from operations	25,549	93,970	60,758	7,302	57,537	(42,748)	67,115	29,906	187,579	111,810	220,556
Other (expense) income	(990)	(139)	(660)	409	244	613	(655)	4,178	(1,380)	4,380	1,705
Net income (loss)	$ 568	$ 40,228	$ 10,395	$ (7,089)	$ 27,377	$ (93,337)	$ 28,672	$ 8,960	$ 44,102	$ (28,328)	$ 95,566
Basic (loss) earnings per share (in dollars per share)	$ 0.01	$ 0.69	$ 0.18	$ (0.12)	$ 0.46	$ (1.55)	$ 0.47	$ 0.15	$ 0.76	$ (0.47)	$ 1.58
Diluted (loss) earnings per share (in dollars per share)	$ 0.01	$ 0.69	$ 0.18	$ (0.12)	$ 0.46	$ (1.55)	$ 0.47	$ 0.15	$ 0.76	$ (0.47)	$ 1.57
Additions to prior year tax positions					$ 5,400				$ 0	$ 419	$ 0
Goodwill [Line Items]
Goodwill impairment charge									31,992	123,414	0
Oil and Gas Field Services
Quarterly Financial Information Disclosure [Abstract]
Revenues									181,780	308,270	$ 390,505
Goodwill [Line Items]
Goodwill impairment charge									$ 31,992	$ 0
Kleen Performance Products
Goodwill [Line Items]
Goodwill impairment charge						$ (123,400)