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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 39,632	$ 34,785
Other comprehensive income
Current period pension and postretirement plan adjustment, net of $226 expense and $14 tax benefit in 2019 and 2018, respectively	758	(301)
Pension settlement, net of $202 tax benefit in 2019	671	0
Reclassification of pension and postretirement adjustments into earnings, net of $90 and $85 tax benefit in 2019 and 2018, respectively	845	489
Total other comprehensive income	2,274	188
Comprehensive income	$ 41,906	$ 34,973

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