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Consolidated Statements of Operations - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Statement [Abstract]      
Net Sales $ 1,003,066 $ 808,572 $ 811,799
Cost of Sales 598,645 456,977 462,739
Gross Profit 404,421 351,595 349,060
Operating Expense:      
Research and Development Expense 32,013 34,738 32,415
Selling and Administrative Expense 345,364 248,210 252,270
Impairment of Long-Lived Assets 0 0 11,199
Loss on Sale of Business 0 149 0
Total Operating Expense 377,377 283,097 295,884
Profit from Operations 27,044 68,498 53,176
Other Income (Expense):      
Interest Income 2,405 330 172
Interest Expense (25,394) (1,279) (1,313)
Net Foreign Currency Transaction Losses (3,387) (392) (954)
Other Expense, Net (1,960) (666) (657)
Total Other Expense, Net (28,336) (2,007) (2,752)
(Loss) Profit Before Income Taxes (1,292) 66,491 50,424
Income Tax Expense 4,913 19,877 18,336
Net (Loss) Earnings Including Noncontrolling Interest (6,205) 46,614 32,088
Net Loss Attributable to Noncontrolling Interest (10) 0 0
Net (Loss) Earnings Attributable to Tennant Company $ (6,195) $ 46,614 $ 32,088
Net (Loss) Earnings Attributable to Tennant Company per Share:      
Basic (in dollars per share) $ (0.35) $ 2.66 $ 1.78
Diluted (in dollars per share) $ (0.35) $ 2.59 $ 1.74
Weighted Average Shares Outstanding:      
Basic (in shares) 17,695,390 17,523,267 18,015,151
Diluted (in shares) 17,695,390 17,976,183 18,493,447
Cash Dividends Declared per Common Share $ 0.84 $ 0.81 $ 0.80