BUSINESS COMBINATIONS 2013 Acquisitions (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Evergreen Oil, Inc.	Sep. 13, 2013 Evergreen Oil, Inc.	Sep. 13, 2013 Evergreen Oil, Inc. Preliminary Allocations	Sep. 13, 2013 Evergreen Oil, Inc. Measurement Period Adjustments
Business Acquisition [Line Items]
Outstanding common shares acquired (as a percent)	100.00%				100.00%
Business Acquisition, Cost of Acquired Entity, Transaction Costs				$ 400,000
Summary of recognized assets acquired and liabilities assumed
Inventories and supplies					1,089,000	1,206,000	(117,000)
Prepaid and other current assets					1,291,000	873,000	418,000
Property, plant and equipment					40,563,000	40,563,000	0
Permits and other intangibles					17,100,000	16,500,000	600,000
Deferred tax assets, less current portion					2,368,000	0	2,368,000
Other assets					3,607,000	3,607,000	0
Current liabilities					(6,198,000)	(6,108,000)	(90,000)
Closure and post-closure liabilities					(659,000)	(659,000)	0
Remedial liabilities, less current portion					(2,103,000)	(2,103,000)	0
Other long-term liabilities					(1,139,000)	(1,139,000)	0
Total identifiable net assets					55,919,000	52,740,000	3,179,000
Goodwill	570,960,000	579,715,000	122,392,000		0	3,179,000	(3,179,000)
Total					$ 55,919,000	$ 55,919,000	$ 0