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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 18,078	$ (40,178)	$ (142,125)
Other comprehensive income (loss), net of income taxes
Reclassification adjustment for losses on cash flow hedges included in net income	115	158	147
Change in unfunded pension plan obligation liability	6,529	(1,620)	(3,442)
Other	84	(39)	(42)
Comprehensive income (loss)	$ 24,806	$ (41,679)	$ (145,462)

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