PROPERTY AND EQUIPMENT (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
PROPERTY AND EQUIPMENT
Total property and equipment	$ 344,507		$ 344,507		$ 355,481
Accumulated depreciation and amortization	(140,120)		(140,120)		(127,797)
Property and equipment, net	204,387		204,387		227,684
Depreciation and amortization expense	6,591	$ 8,318	21,726	$ 16,730
Cell development costs
PROPERTY AND EQUIPMENT
Total property and equipment	120,032		120,032		120,878
Land and improvements
PROPERTY AND EQUIPMENT
Total property and equipment	31,811		31,811		33,002
Buildings and improvements
PROPERTY AND EQUIPMENT
Total property and equipment	69,883		69,883		74,518
Railcars
PROPERTY AND EQUIPMENT
Total property and equipment	17,375		17,375		17,375
Vehicles and other equipment
PROPERTY AND EQUIPMENT
Total property and equipment	86,527		86,527		98,877
Construction in progress
PROPERTY AND EQUIPMENT
Total property and equipment	$ 18,879		$ 18,879		$ 10,831