ACCRUED EXPENSES (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Accrued Expenses [ABSTRACT]
Insurance	$ 24,840	$ 21,712
Interest	15,515	15,434
Accrued disposal costs	2,058	2,455
Accrued compensation and benefits	42,562	56,029
Income, real estate, sales and other taxes	17,252	14,863
Other	28,299	37,499
Total accrued expenses	$ 130,526	$ 147,992