BUSINESS COMBINATIONS (Evergreen Oil, Inc) (Details) (Privately owned domestic company, USD $) In Millions, unless otherwise specified	12 Months Ended	0 Months Ended
Dec. 31, 2014 number_of_companies	Apr. 14, 2015
Business Acquisition [Line Items]
Number of Companies	2clh_NumberofCompanies
Purchase price of acquisition	$ 16.1
Subsequent Event
Business Acquisition [Line Items]
Business Combination, Consideration Transferred		$ 85.0

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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-Name Accounting Standards Codification

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