SEGMENT INFORMATION AND GEOGRAPHICAL DATA (Details) $ in Thousands		12 Months Ended
		Dec. 31, 2015 USD ($) Segment	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | Segment		2
Statements of Operations Data:
Revenues	[1]	$ 711,639	$ 1,111,254	$ 873,255
Cost of goods sold (excluding depreciation, depletion and amortization)	[1]	635,825	950,006	767,911
Depreciation, depletion and amortization		28,441	24,803	20,828
Selling, general and administrative expenses		33,119	38,723	26,835
IPO transaction-related costs		0	0	10,966
Project terminations		10,652	0	0
Income from operations		3,602	97,722	46,715
Capital expenditures		35,474	77,884	21,369
Total assets (at year end)		420,048	432,127	319,547
Operating segments | Sand Segment
Statements of Operations Data:
Revenues		269,518	341,836	167,768
Cost of goods sold (excluding depreciation, depletion and amortization)		209,161	204,282	91,416
Depreciation, depletion and amortization		17,863	12,777	10,458
Selling, general and administrative expenses		15,142	15,821	10,556
IPO transaction-related costs				0
Project terminations		10,652
Income from operations		16,700	108,956	55,338
Capital expenditures		27,995	76,473	20,406
Total assets (at year end)		261,761	284,330	138,755
Operating segments | Fuel Segment
Statements of Operations Data:
Revenues		442,121	769,418	705,487
Cost of goods sold (excluding depreciation, depletion and amortization)		426,664	745,724	676,495
Depreciation, depletion and amortization		10,544	11,998	10,369
Selling, general and administrative expenses		4,972	5,319	6,057
IPO transaction-related costs				0
Project terminations		0
Income from operations		(59)	6,377	12,566
Capital expenditures		7,251	1,086	931
Total assets (at year end)		139,070	142,354	172,833
Corporate
Statements of Operations Data:
Revenues		0	0	0
Cost of goods sold (excluding depreciation, depletion and amortization)		0	0	0
Depreciation, depletion and amortization		34	28	1
Selling, general and administrative expenses		13,005	17,583	10,222
IPO transaction-related costs				10,966
Project terminations		0
Income from operations		(13,039)	(17,611)	(21,189)
Capital expenditures		228	325	32
Total assets (at year end)		$ 19,217	$ 5,443	$ 7,959

[1] Fuel revenues and cost of goods sold include excise taxes and similar taxes $50,939 $50,116 $47,007.