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Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 58,698	$ 58,518	$ 69,909	$ 24,666
Changes in defined benefit pension plans, net of tax of $421, $317, $1,170 and $891	1,337	1,002	3,710	2,803
Other	19	6	57	18
Total comprehensive income attributable to preferred and common stockholders	$ 60,054	$ 59,526	$ 73,676	$ 27,487

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