MEMBERS' EQUITY Table 2 (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Our cash distributions applicable to the period in which the distributions were earned
Cash distributions per unit	$ 0.545	$ 0.545	$ 0.545	$ 0.545	$ 2.18	$ 2.18	$ 2.180
Total cash distributions	$ 23,408	$ 23,398	$ 23,398	$ 23,397	$ 93,601	$ 93,561	$ 93,252