Douglas Dynamics, Inc. Annual report pursuant to Section 13 and 15(d)

Changes in Accumulated Other Comprehensive Loss by Component - Rollforward (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Changes to accumulated other comprehensive loss by component
Balance at the beginning of the period	$ (2,814)	$ (6,049)
Other comprehensive gain (loss) before reclassifications	(4,914)	(3,731)
Amounts reclassified from accumulated other comprehensive loss	2,233	586
Pension termination		6,380
Balance at the end of the period	(5,495)	(2,814)
Unrealized Net Loss on Interest Rate Swap
Changes to accumulated other comprehensive loss by component
Balance at the beginning of the period	(5,023)	(1,530)
Other comprehensive gain (loss) before reclassifications	(5,047)	(3,867)
Amounts reclassified from accumulated other comprehensive loss	2,462	374
Balance at the end of the period	(7,608)	(5,023)
Other Postretirement Benefit Liability
Changes to accumulated other comprehensive loss by component
Balance at the beginning of the period	2,209	2,118
Other comprehensive gain (loss) before reclassifications	133	325
Amounts reclassified from accumulated other comprehensive loss	(229)	(234)
Balance at the end of the period	$ 2,113	2,209
Pension Liability
Changes to accumulated other comprehensive loss by component
Balance at the beginning of the period		(6,637)
Other comprehensive gain (loss) before reclassifications		(189)
Amounts reclassified from accumulated other comprehensive loss		446
Pension termination		$ 6,380