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

Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt - Summary (Details)

Long-Term Debt - Summary (Details) $ in Thousands						3 Months Ended		12 Months Ended
Long-Term Debt - Summary (Details) $ in Thousands	Jan. 31, 2018 USD ($)	Aug. 17, 2017	Aug. 16, 2017	Feb. 08, 2017	Feb. 07, 2017	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)	Jul. 15, 2016 USD ($)	Dec. 31, 2014 USD ($)
Long-term debt
Less current maturities						$ 2,749		$ 32,749
Long-term debt, less current maturities						274,391		274,872
Deferred financing costs, net						3,003		3,209
Total long-term debt						274,391		274,872
Long-term debt, additional disclosure
Financing costs							$ 932
Inventories - truck chassis floor plan						4,555		7,711
Term loan facility
Long-term debt
Notes and Loans Payable, Current, Total						280,143		310,830
Less current maturities						2,749		32,749
Long-term debt, less current maturities						277,394		278,081
Long-term debt, additional disclosure
Unamortized discount on issuance of debt						1,464		1,562		$ 1,900
Outstanding borrowings						$ 280,143		310,830
Revolving credit facility
Long-term debt, additional disclosure
Outstanding borrowings								0
Incremental Term Loan Facility
Long-term debt, additional disclosure
Unamortized discount on issuance of debt									$ 650
Senior credit facilities
Long-term debt, additional disclosure
Floor plan financing arrangements									$ 20,000
Senior credit facilities \| Term loan facility
Long-term debt, additional disclosure
Financing costs								932
Percentage of net cash proceeds of certain asset sales, certain insurance or condemnation events, requirement for additional principal prepayments						100.00%
Percentage of excess cash flow paid as additional principal prepayments						50.00%
Reduced percentage of excess cash flow paid as additional principal prepayments upon achievement of certain leverage ratio thresholds, one						0.00%
Excess cash flow payment	$ 11,279
Voluntary payment	$ 18,721
Senior credit facilities \| Term loan facility \| Maximum
Long-term debt, additional disclosure
Additional term loan commitments						$ 80,000
Debt ratio						3.25
Period before end of the fiscal year, for additional principal prepayments of debt, from excess cash flow						150 days
Senior credit facilities \| Term loan facility \| ABR
Long-term debt, additional disclosure
Interest rate margin (as a percent)		2.00%	2.50%	2.50%	3.25%
Senior credit facilities \| Term loan facility \| Euro dollar
Long-term debt, additional disclosure
Interest rate margin (as a percent)		3.00%	3.50%	3.50%	4.25%
Senior credit facilities \| Term loan facility \| First option
Long-term debt, additional disclosure
Interest rate margin (as a percent)			0.50%		0.50%
Fixed interest rate base (as a percent)			2.00%		2.50%
Additional interest margin added to fixed and variable rates (as a percent)			1.00%		1.00%
Additional fixed interest rate spread (as a percent)			2.00%		2.00%
Senior credit facilities \| Term loan facility \| Second option
Long-term debt, additional disclosure
Fixed interest rate base (as a percent)			3.00%		3.50%
Additional fixed interest rate spread (as a percent)			1.00%		1.00%
Senior credit facilities \| Revolving credit facility
Long-term debt, additional disclosure
Borrowings under senior credit facility						$ 100,000
Remaining borrowing availability						$ 54,491		99,463
Fixed charge coverage ratio to be maintained if certain minimum availability under the credit facility is not maintained.						1.0
Senior credit facilities \| Revolving credit facility \| Maximum
Long-term debt, additional disclosure
Annual acquisitions allowed						$ 12,500
Unused portion of permitted capital expenditures						12,500
Facilities consolidation expenditure allowed						$ 15,000
Senior credit facilities \| Revolving credit facility \| Fixed rate \| Maximum
Long-term debt, additional disclosure
Fixed interest rate base (as a percent)						2.00%
Senior credit facilities \| Revolving credit facility \| First option \| Fixed rate \| Minimum
Long-term debt, additional disclosure
Fixed interest rate base (as a percent)						1.50%
Senior credit facilities \| Revolving credit facility \| Second option \| Federal funds
Long-term debt, additional disclosure
Variable rate basis description						Federal funds
Interest rate margin (as a percent)						0.50%
Senior credit facilities \| Revolving credit facility \| Second option \| Fixed rate \| Maximum
Long-term debt, additional disclosure
Fixed interest rate base (as a percent)						1.00%
Senior credit facilities \| Revolving credit facility \| Second option \| Fixed rate \| Minimum
Long-term debt, additional disclosure
Fixed interest rate base (as a percent)						0.50%
Senior credit facilities \| Revolving credit facility \| Second option \| One month London Interbank Offered Rate
Long-term debt, additional disclosure
Variable rate basis description						LIBOR for a one month interest period
Interest rate margin (as a percent)						1.00%
Senior credit facilities \| Revolving credit facility \| Second option \| Prime
Long-term debt, additional disclosure
Variable rate basis description						Prime Rate
Senior credit facilities \| Amended term loan facility
Long-term debt, additional disclosure
Financing costs								$ 676
Letter of Credit
Long-term debt, additional disclosure
Maximum borrowing capacity						$ 10,000
Swingline loan
Long-term debt, additional disclosure
Maximum borrowing capacity						$ 5,000