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Separate Financial Information of Guarantor Subsidiaries Statements of Earnings (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Sales | $ 285,212 | $ 273,255 | $ 292,197 | $ 272,847 | $ 279,295 | $ 261,921 | $ 270,791 | $ 191,059 | $ 1,123,511 | $ 1,003,066 | $ 808,572
Cost of Sales |  |  |  |  |  |  |  |  | 678,478 | 603,253 | 456,977
Gross Profit | 112,172 | 106,509 | 117,225 | 109,116 | 113,866 | 103,081 | 103,130 | 79,736 | 445,033 | 399,813 | 351,595
Operating Expense: |  |  |  |  |  |  |  |  |  |  |
Research and Development Expense |  |  |  |  |  |  |  |  | 30,739 | 32,013 | 34,738
Selling and Administrative Expense |  |  |  |  |  |  |  |  | 356,316 | 334,782 | 248,592
Total Operating Expense |  |  |  |  |  |  |  |  | 387,055 | 366,795 | 283,330
Profit from Operations |  |  |  |  |  |  |  |  | 57,978 | 33,018 | 68,265
Other Income and Expenses [Abstract] |  |  |  |  |  |  |  |  |  |  |
Equity in Earnings of Affiliates |  |  |  |  |  |  |  |  | 0 | 0 | 0
Interest (Expense) Income, Net |  |  |  |  |  |  |  |  | (20,307) | (22,989) | (949)
Intercompany Interest Income (Expense) |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net Foreign Currency Transaction Losses |  |  |  |  |  |  |  |  | (1,100) | (3,387) | (392)
Other (Expense) Income, Net |  |  |  |  |  |  |  |  | (729) | (7,934) | (433)
Total Other Expense, Net |  |  |  |  |  |  |  |  | (22,136) | (34,310) | (1,774)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest |  |  |  |  |  |  |  |  | 35,842 | (1,292) | 66,491
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | 2,304 | 4,913 | 19,877
Net Earnings (Loss) Including Noncontrolling Interest |  |  |  |  |  |  |  |  | 33,538 | (6,205) | 46,614
Net Earnings Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  | 126 | (10) | 0
Net Earnings (Loss) Attributable to Tennant Company | $ 7,717 | $ 9,676 | $ 12,744 | $ 3,274 | $ (3,206) | $ 3,559 | $ (2,591) | $ (3,957) | 33,412 | (6,195) | 46,614
Parent Company |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 494,341 | 454,703 | 455,375
Cost of Sales |  |  |  |  |  |  |  |  | 336,398 | 311,897 | 299,459
Gross Profit |  |  |  |  |  |  |  |  | 157,943 | 142,806 | 155,916
Operating Expense: |  |  |  |  |  |  |  |  |  |  |
Research and Development Expense |  |  |  |  |  |  |  |  | 24,455 | 27,219 | 32,378
Selling and Administrative Expense |  |  |  |  |  |  |  |  | 116,528 | 110,414 | 95,340
Total Operating Expense |  |  |  |  |  |  |  |  | 140,983 | 137,633 | 127,718
Profit from Operations |  |  |  |  |  |  |  |  | 16,960 | 5,173 | 28,198
Other Income and Expenses [Abstract] |  |  |  |  |  |  |  |  |  |  |
Equity in Earnings of Affiliates |  |  |  |  |  |  |  |  | 27,409 | 12,754 | 34,068
Interest (Expense) Income, Net |  |  |  |  |  |  |  |  | (20,466) | (22,659) | (1,204)
Intercompany Interest Income (Expense) |  |  |  |  |  |  |  |  | 14,597 | 12,519 | 7,157
Net Foreign Currency Transaction Losses |  |  |  |  |  |  |  |  | (370) | 857 | 648
Other (Expense) Income, Net |  |  |  |  |  |  |  |  | (2,288) | (9,936) | (2,376)
Total Other Expense, Net |  |  |  |  |  |  |  |  | 18,882 | (6,465) | 38,293
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest |  |  |  |  |  |  |  |  | 35,842 | (1,292) | 66,491
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | 2,304 | 4,913 | 19,877
Net Earnings (Loss) Including Noncontrolling Interest |  |  |  |  |  |  |  |  | 33,538 | (6,205) | 46,614
Net Earnings Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  | 126 | (10) |
Net Earnings (Loss) Attributable to Tennant Company |  |  |  |  |  |  |  |  | 33,412 | (6,195) | 46,614
Guarantor Subsidiaries |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 634,341 | 594,405 | 587,815
Cost of Sales |  |  |  |  |  |  |  |  | 533,800 | 488,972 | 483,075
Gross Profit |  |  |  |  |  |  |  |  | 100,541 | 105,433 | 104,740
Operating Expense: |  |  |  |  |  |  |  |  |  |  |
Research and Development Expense |  |  |  |  |  |  |  |  | 1,090 | 315 | 429
Selling and Administrative Expense |  |  |  |  |  |  |  |  | 76,623 | 78,516 | 74,643
Total Operating Expense |  |  |  |  |  |  |  |  | 77,713 | 78,831 | 75,072
Profit from Operations |  |  |  |  |  |  |  |  | 22,828 | 26,602 | 29,668
Other Income and Expenses [Abstract] |  |  |  |  |  |  |  |  |  |  |
Equity in Earnings of Affiliates |  |  |  |  |  |  |  |  | 2,249 | 2,004 | 2,192
Interest (Expense) Income, Net |  |  |  |  |  |  |  |  | 0 | 0 | 0
Intercompany Interest Income (Expense) |  |  |  |  |  |  |  |  | (5,760) | (5,776) | (5,570)
Net Foreign Currency Transaction Losses |  |  |  |  |  |  |  |  | (21) | 0 | (652)
Other (Expense) Income, Net |  |  |  |  |  |  |  |  | (2,434) | (736) | (573)
Total Other Expense, Net |  |  |  |  |  |  |  |  | (5,966) | (4,508) | (4,603)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest |  |  |  |  |  |  |  |  | 16,862 | 22,094 | 25,065
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | 4,022 | 8,070 | 9,443
Net Earnings (Loss) Including Noncontrolling Interest |  |  |  |  |  |  |  |  | 12,840 | 14,024 | 15,622
Net Earnings Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  | 0 | 0 |
Net Earnings (Loss) Attributable to Tennant Company |  |  |  |  |  |  |  |  | 12,840 | 14,024 | 15,622
Non-Guarantor Subsidiaries |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 570,627 | 471,559 | 290,349
Cost of Sales |  |  |  |  |  |  |  |  | 383,010 | 321,759 | 199,336
Gross Profit |  |  |  |  |  |  |  |  | 187,617 | 149,800 | 91,013
Operating Expense: |  |  |  |  |  |  |  |  |  |  |
Research and Development Expense |  |  |  |  |  |  |  |  | 5,194 | 4,479 | 1,931
Selling and Administrative Expense |  |  |  |  |  |  |  |  | 161,911 | 145,852 | 78,609
Total Operating Expense |  |  |  |  |  |  |  |  | 167,105 | 150,331 | 80,540
Profit from Operations |  |  |  |  |  |  |  |  | 20,512 | (531) | 10,473
Other Income and Expenses [Abstract] |  |  |  |  |  |  |  |  |  |  |
Equity in Earnings of Affiliates |  |  |  |  |  |  |  |  | 5,374 | 28,855 | 0
Interest (Expense) Income, Net |  |  |  |  |  |  |  |  | 196 | (299) | 255
Intercompany Interest Income (Expense) |  |  |  |  |  |  |  |  | (8,837) | (6,743) | (1,587)
Net Foreign Currency Transaction Losses |  |  |  |  |  |  |  |  | (709) | (4,244) | (388)
Other (Expense) Income, Net |  |  |  |  |  |  |  |  | 2,862 | 2,841 | 2,516
Total Other Expense, Net |  |  |  |  |  |  |  |  | (1,114) | 20,410 | 796
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest |  |  |  |  |  |  |  |  | 19,398 | 19,879 | 11,269
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | 388 | (98) | 2,427
Net Earnings (Loss) Including Noncontrolling Interest |  |  |  |  |  |  |  |  | 19,010 | 19,977 | 8,842
Net Earnings Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  | 126 | (10) |
Net Earnings (Loss) Attributable to Tennant Company |  |  |  |  |  |  |  |  | 18,884 | 19,987 | 8,842
Eliminations |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | (575,798) | (517,601) | (524,967)
Cost of Sales |  |  |  |  |  |  |  |  | (574,730) | (519,375) | (524,893)
Gross Profit |  |  |  |  |  |  |  |  | (1,068) | 1,774 | (74)
Operating Expense: |  |  |  |  |  |  |  |  |  |  |
Research and Development Expense |  |  |  |  |  |  |  |  | 0 | 0 | 0
Selling and Administrative Expense |  |  |  |  |  |  |  |  | 1,254 | 0 | 0
Total Operating Expense |  |  |  |  |  |  |  |  | 1,254 | 0 | 0
Profit from Operations |  |  |  |  |  |  |  |  | (2,322) | 1,774 | (74)
Other Income and Expenses [Abstract] |  |  |  |  |  |  |  |  |  |  |
Equity in Earnings of Affiliates |  |  |  |  |  |  |  |  | (35,032) | (43,613) | (36,260)
Interest (Expense) Income, Net |  |  |  |  |  |  |  |  | (37) | (31) | 0
Intercompany Interest Income (Expense) |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net Foreign Currency Transaction Losses |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other (Expense) Income, Net |  |  |  |  |  |  |  |  | 1,131 | (103) | 0
Total Other Expense, Net |  |  |  |  |  |  |  |  | (33,938) | (43,747) | (36,260)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest |  |  |  |  |  |  |  |  | (36,260) | (41,973) | (36,334)
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | (4,410) | (7,972) | (11,870)
Net Earnings (Loss) Including Noncontrolling Interest |  |  |  |  |  |  |  |  | (31,850) | (34,001) | (24,464)
Net Earnings Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  | (126) | 10 |
Net Earnings (Loss) Attributable to Tennant Company |  |  |  |  |  |  |  |  | $ (31,724) | $ (34,011) | $ (24,464)

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