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Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - 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)	$ 5,644	$ (22,043)	$ 11,211	$ (33,852)
Changes in defined benefit pension plans, net of tax of $375, $288, $749 and $574	1,186	899	2,373	1,801
Other	20	6	38	12
Total comprehensive income (loss) attributable to preferred and common stockholders	$ 6,850	$ (21,138)	$ 13,622	$ (32,039)

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