SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Cash paid during the period for:
Interest expense (including capitalized amounts)	$ 39,140	$ 39,277	$ 39,734	$ 40,212
Interest capitalized	9,917	16,583	10,057	16,997
Income taxes	$ 2	555	13	556
Cash received for income taxes		$ 109	$ 25	$ 409