MEMBERS' EQUITY Table 2 (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended					9 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
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	$ 0.545	$ 1.635	$ 1.635
Total cash distributions	$ 23,409	$ 23,408	$ 23,409	$ 23,408	$ 23,398	$ 70,226	$ 70,193