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UNAUDITED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 8,543	$ (25,489)
Other comprehensive income, net of income taxes:
Change in unfunded pension plan obligation liability	(367)	46
Other	24	36
Comprehensive income (loss)	$ 8,200	$ (25,407)

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