STATEMENTS OF CHANGES IN MEMBERS' EQUITY - USD ($) $ in Thousands	Accumulated Other Comprehensive Income	Members' Equity	Total
BALANCE at Dec. 31, 2014		$ 34,053	$ 34,053
Increase (Decrease) in Stockholders' Equity
Net income		4,533	4,533
Member distributions		(10,225)	(10,225)
Pension Liability Adjustment	$ (48)		(48)
BALANCE at Dec. 31, 2015	(48)	28,361	28,313
Increase (Decrease) in Stockholders' Equity
Net income		4,704	4,704
Member distributions		(9,449)	(9,449)
Pension Liability Adjustment	$ 48		48
BALANCE at Dec. 31, 2016		23,616	23,616
Increase (Decrease) in Stockholders' Equity
Net income		9,182	9,182
Member distributions		(6,552)	(6,552)
BALANCE at Dec. 31, 2017		$ 26,246	$ 26,246