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UNAUDITED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (10,322)	$ 1,954	$ (1,779)	$ (23,535)
Other comprehensive income, net of income taxes:
Change in unfunded pension plan obligation liability	(367)	46	(733)	92
Other	22	40	45	76
Comprehensive income (loss)	$ (10,667)	$ 2,040	$ (2,467)	$ (23,367)

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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