ACCRUED LIABILITIES - (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Payables and Accruals [Abstract]
Accrued materials	$ 13,675	$ 5,745
Accrued insurance reserves	9,837	9,816
Accrued compensation and benefits	8,607	7,381
Accrued property, sales and other taxes	6,169	4,632
Accrued interest	3,163	547
Accrued rent	2,187	1,904
Other	5,146	6,405
Total accrued liabilities	$ 48,784	$ 36,430