Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Consolidated Statements of Comprehensive Income [Abstract]
Net income (loss)	$ 4,919	$ (29)
Other comprehensive income (loss), net of tax
Net unrealized gain (loss) on available-for-sale securities	(1,233)	1,032
Changes in defined benefit plan assets and benefit obligations	0	2,469
Other comprehensive income (loss), net of tax	(1,233)	3,501
Comprehensive income	$ 3,686	$ 3,472