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Separate Financial Information of Guarantor Subsidiaries Statements of Comprehensive Income (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |
Net (Loss) Earnings Including Noncontrolling Interest | $ (6,205) | $ 46,614 | $ 32,088
Other Comprehensive Income (Loss): |  |  |
Foreign currency translation adjustments | 28,356 | 109 | (12,520)
Pension and retiree medical benefits | 5,868 | (2,248) | 4,121
Cash flow hedge | (7,731) | (305) | 164
Income Taxes: |  |  |
Foreign currency translation adjustments | 310 | 32 | 25
Pension and retiree medical benefits | (2,087) | 504 | (1,265)
Cash flow hedge | 2,884 | 114 | (61)
Total Other Comprehensive (Loss) Income, net of tax | 27,600 | (1,794) | (9,536)
Total Comprehensive Income Including Noncontrolling Interest | 21,395 | 44,820 | 22,552
Comprehensive Loss Attributable to Noncontrolling Interest | (10) | 0 | 0
Comprehensive Income Attributable to Tennant Company | 21,405 | 44,820 | 22,552
Parent Company |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |
Net (Loss) Earnings Including Noncontrolling Interest | (6,205) | 46,614 | 32,088
Other Comprehensive Income (Loss): |  |  |
Foreign currency translation adjustments | 28,356 | 109 | (12,520)
Pension and retiree medical benefits | 5,868 | (2,248) | 4,121
Cash flow hedge | (7,731) | (305) | 164
Income Taxes: |  |  |
Foreign currency translation adjustments | 310 | 32 | 25
Pension and retiree medical benefits | (2,087) | 504 | (1,265)
Cash flow hedge | 2,884 | 114 | (61)
Total Other Comprehensive (Loss) Income, net of tax | 27,600 | (1,794) | (9,536)
Total Comprehensive Income Including Noncontrolling Interest | 21,395 |  |
Comprehensive Loss Attributable to Noncontrolling Interest | (10) |  |
Comprehensive Income Attributable to Tennant Company | 21,405 | 44,820 | 22,552
Guarantor Subsidiaries |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |
Net (Loss) Earnings Including Noncontrolling Interest | 14,024 | 15,622 | 14,512
Other Comprehensive Income (Loss): |  |  |
Foreign currency translation adjustments | 1,215 | 270 | (1,082)
Pension and retiree medical benefits | 0 | 0 | 0
Cash flow hedge | 0 | 0 | 0
Income Taxes: |  |  |
Foreign currency translation adjustments | 0 | 0 | 0
Pension and retiree medical benefits | 0 | 0 | 0
Cash flow hedge | 0 | 0 | 0
Total Other Comprehensive (Loss) Income, net of tax | 1,215 | 270 | (1,082)
Total Comprehensive Income Including Noncontrolling Interest | 15,239 |  |
Comprehensive Loss Attributable to Noncontrolling Interest | 0 |  |
Comprehensive Income Attributable to Tennant Company | 15,239 | 15,892 | 13,430
Non-Guarantor Subsidiaries |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |
Net (Loss) Earnings Including Noncontrolling Interest | 19,977 | 8,842 | (2,763)
Other Comprehensive Income (Loss): |  |  |
Foreign currency translation adjustments | 2,960 | 3,534 | (12,903)
Pension and retiree medical benefits | 538 | (1,691) | 1,571
Cash flow hedge | 0 | 0 | 0
Income Taxes: |  |  |
Foreign currency translation adjustments | 310 | 32 | 25
Pension and retiree medical benefits | (99) | 296 | (314)
Cash flow hedge | 0 | 0 | 0
Total Other Comprehensive (Loss) Income, net of tax | 3,709 | 2,171 | (11,621)
Total Comprehensive Income Including Noncontrolling Interest | 23,686 |  |
Comprehensive Loss Attributable to Noncontrolling Interest | (10) |  |
Comprehensive Income Attributable to Tennant Company | 23,696 | 11,013 | (14,384)
Consolidation, Eliminations |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |
Net (Loss) Earnings Including Noncontrolling Interest | (34,001) | (24,464) | (11,749)
Other Comprehensive Income (Loss): |  |  |
Foreign currency translation adjustments | (4,175) | (3,804) | 13,985
Pension and retiree medical benefits | (538) | 1,691 | (1,571)
Cash flow hedge | 0 | 0 | 0
Income Taxes: |  |  |
Foreign currency translation adjustments | (310) | (32) | (25)
Pension and retiree medical benefits | 99 | (296) | 314
Cash flow hedge | 0 | 0 | 0
Total Other Comprehensive (Loss) Income, net of tax | (4,924) | (2,441) | 12,703
Total Comprehensive Income Including Noncontrolling Interest | (38,925) |  |
Comprehensive Loss Attributable to Noncontrolling Interest | 10 |  |
Comprehensive Income Attributable to Tennant Company | $ (38,935) | $ (26,905) | $ 954

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