RESTRICTED CASH (Details) (USD $)	1 Months Ended	12 Months Ended
Dec. 31, 2011	Dec. 31, 2012
RESTRICTED CASH
Restricted cash	$ 35,441,000	$ 25,450,000
Self-insurance deposit
RESTRICTED CASH
Restricted cash	3,400,000	4,700,000
Qualified environmental trust fund
RESTRICTED CASH
Restricted cash		20,700,000
Contribution to qualified environmental trust ("QET")	32,000,000
Amount withdrawn from the trust to fund the environmental remediation expenditures		$ 12,000,000

- Definition

The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. For a classified balance sheet represents the current portion only (the noncurrent portion has a separate concept); there is a separate and distinct element for unclassified presentations.

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