Douglas Dynamics, Inc. Quarterly report pursuant to Section 13 or 15(d)

Changes in Accumulated Other Comprehensive Loss by Component - Reclassifications (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Amounts reclassified from accumulated other comprehensive loss:
Interest expense, net	$ 5,007	$ 4,271	$ 15,709	$ 12,610
Tax expense (benefit)	3,234	3,113	(17,484)	10,949
Reclassification net of tax	$ (9,109)	$ (12,266)	104,715	(37,105)
Interest rate swap \| Amount reclassified from accumulated other comprehensive income
Amounts reclassified from accumulated other comprehensive loss:
Interest expense, net				206
Tax expense (benefit)				(54)
Reclassification net of tax				152
Other Postretirement Benefit Liability \| Amount reclassified from accumulated other comprehensive income
Amounts reclassified from accumulated other comprehensive loss:
Actuarial (gains) losses			(231)	(234)
Tax expense (benefit)			60	61
Reclassification net of tax			(171)	(173)
Pension Liability \| Amount reclassified from accumulated other comprehensive income
Amounts reclassified from accumulated other comprehensive loss:
Actuarial (gains) losses				447
Tax expense (benefit)				(117)
Reclassification net of tax				$ 330
Unrealized Net Loss on Interest Rate Swap \| Interest rate swap
Amounts reclassified from accumulated other comprehensive loss:
Interest expense, net			2,277
Tax expense (benefit)			(592)
Reclassification net of tax			$ 1,685