MEMBERS' EQUITY Table 3 (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended				12 Months Ended
	Jan. 27, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Distribution Made to Limited Liability Company (LLC) Member [Line Items]
Cash distributions per unit applicable to members (distribution earned)		$ 0.545	$ 0.545	$ 0.545	$ 0.545	$ 2.18	$ 2.18	$ 2.180
Total cash distributions (distribution earned)		$ 23,408	$ 23,398	$ 23,398	$ 23,397	$ 93,601	$ 93,561	$ 93,252
Distribution date of record (distribution earned)		Feb. 08, 2017	Nov. 08, 2016	Aug. 09, 2016	May 09, 2016
Distribution payment date (distribution earned)		Feb. 15, 2017	Nov. 16, 2016	Aug. 16, 2016	May 17, 2016
Subsequent Event [Member]
Distribution Made to Limited Liability Company (LLC) Member [Line Items]
Distribution announcement date (distribution earned)	Jan. 27, 2017