SUPPLEMENTAL CASH FLOW INFORMATION (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash paid for interest (net of capitalized interest)	$ 57,813	$ 57,646
Cash paid for income taxes	542	1,093
Capitalized interest	3,178	4,524
Non-cash investing activities:
Decrease in accounts payable and accrued and other current liabilities related to capital expenditures	(6,020)	(636)
Class B Units
Non-cash financing activities:
Issuance of Class B Units in lieu of quarterly cash distribution	$ 16,843	$ 15,304