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Income Taxes - Income Tax Expense in Other Comprehensive (Loss) Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Tax Disclosure [Abstract]
Unrealized change in cash flow hedging instruments	$ 199	$ (160)	$ 42	$ 235
Realized change in cash flow hedging instruments	82	(29)	358	(211)
Reclassification of unrealized change in ineffective cash flow hedging instruments	7		83
Defined benefit and postretirement benefit plans	(12)		(37)	40
Income tax effect on other comprehensive income (loss)	$ 276	$ (189)	$ 446	$ 64

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Amount of tax expense (benefit) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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Amount, after reclassification, of tax expense (benefit) for gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness, attributable to parent.

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Amount, before reclassification, of tax expense (benefit) for gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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Amount of tax expense (benefit) for reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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Amount of tax expense (benefit) allocated to other comprehensive income (loss).

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