Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Consolidated Statements of Comprehensive Income (Loss) [Abstract]
Net Income (Loss)	$ 9,292	$ (25,221)
Other Comprehensive Income (Loss), Net of Tax:
Amortization of actuarial losses	247	630
Actuarial gains (losses)	5,100	(13,339)
Total other comprehensive income (loss), net of tax	5,347	(12,709)
Total Comprehensive Income (Loss)	$ 14,639	$ (37,930)