STATEMENTS OF CHANGES IN MEMBERS' EQUITY $ in Thousands	USD ($)
BALANCE at Dec. 31, 2017	$ 26,246
Increase (Decrease) in Stockholders' Equity
Net income	4,689
Distribution to Members	(6,831)
BALANCE at Sep. 30, 2018	24,104
BALANCE at Jun. 30, 2018	24,910
Increase (Decrease) in Stockholders' Equity
Net income	1,361
Distribution to Members	(2,167)
BALANCE at Sep. 30, 2018	24,104
BALANCE at Dec. 31, 2018	25,836
Increase (Decrease) in Stockholders' Equity
Net income	5,604
Distribution to Members	(6,692)
BALANCE at Sep. 30, 2019	24,748
BALANCE at Jun. 30, 2019	25,366
Increase (Decrease) in Stockholders' Equity
Net income	1,550
Distribution to Members	(2,168)
BALANCE at Sep. 30, 2019	$ 24,748