ACCRUED EXPENSES (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Accrued Expenses [ABSTRACT]
Insurance	$ 21,712	$ 19,736
Interest	15,434	7,826
Accrued disposal costs	2,455	2,173
Accrued compensation and benefits	56,029	44,545
Income, real estate, sales and other taxes	14,863	19,529
Other	37,499	22,280
Total accrued expenses	$ 147,992	$ 116,089