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Separate Financial Information of Guarantor Subsidiaries Statements of Comprehensive Income (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |
Net Earnings (Loss) Including Noncontrolling Interest | $ 33,538 | $ (6,205) | $ 46,614
Other Comprehensive (Loss) Income: |  |  |
Foreign currency translation adjustments | (16,221) | 28,356 | 109
Pension and retiree medical benefits | 1,745 | 5,868 | (2,248)
Cash flow hedge | 1,341 | (7,731) | (305)
Income Taxes: |  |  |
Foreign currency translation adjustments | 168 | 310 | 32
Pension and retiree medical benefits | (467) | (2,087) | 504
Cash flow hedge | (1,437) | 2,884 | 114
Total Other Comprehensive (Loss) Income, net of tax | (14,871) | 27,600 | (1,794)
Total Comprehensive Income Including Noncontrolling Interest | 18,667 | 21,395 | 44,820
Comprehensive Income (Loss) Attributable to Noncontrolling Interest | 126 | (10) | 0
Comprehensive Income Attributable to Tennant Company | 18,541 | 21,405 | 44,820
Parent Company |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |
Net Earnings (Loss) Including Noncontrolling Interest | 33,538 | (6,205) | 46,614
Other Comprehensive (Loss) Income: |  |  |
Foreign currency translation adjustments | (16,221) | 28,356 | 109
Pension and retiree medical benefits | 1,745 | 5,868 | (2,248)
Cash flow hedge | 1,341 | (7,731) | (305)
Income Taxes: |  |  |
Foreign currency translation adjustments | 168 | 310 | 32
Pension and retiree medical benefits | (467) | (2,087) | 504
Cash flow hedge | (1,437) | 2,884 | 114
Total Other Comprehensive (Loss) Income, net of tax | (14,871) | 27,600 | (1,794)
Total Comprehensive Income Including Noncontrolling Interest | 18,667 | 21,395 |
Comprehensive Income (Loss) Attributable to Noncontrolling Interest | 126 | (10) |
Comprehensive Income Attributable to Tennant Company | 18,541 | 21,405 | 44,820
Guarantor Subsidiaries |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |
Net Earnings (Loss) Including Noncontrolling Interest | 12,840 | 14,024 | 15,622
Other Comprehensive (Loss) Income: |  |  |
Foreign currency translation adjustments | (961) | 1,215 | 270
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 | (961) | 1,215 | 270
Total Comprehensive Income Including Noncontrolling Interest | 11,879 | 15,239 |
Comprehensive Income (Loss) Attributable to Noncontrolling Interest | 0 | 0 |
Comprehensive Income Attributable to Tennant Company | 11,879 | 15,239 | 15,892
Non-Guarantor Subsidiaries |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |
Net Earnings (Loss) Including Noncontrolling Interest | 19,010 | 19,977 | 8,842
Other Comprehensive (Loss) Income: |  |  |
Foreign currency translation adjustments | (21,422) | 2,960 | 3,534
Pension and retiree medical benefits | 1,197 | 538 | (1,691)
Cash flow hedge | 0 | 0 | 0
Income Taxes: |  |  |
Foreign currency translation adjustments | 168 | 310 | 32
Pension and retiree medical benefits | (205) | (99) | 296
Cash flow hedge | 0 | 0 | 0
Total Other Comprehensive (Loss) Income, net of tax | (20,262) | 3,709 | 2,171
Total Comprehensive Income Including Noncontrolling Interest | (1,252) | 23,686 |
Comprehensive Income (Loss) Attributable to Noncontrolling Interest | 126 | (10) |
Comprehensive Income Attributable to Tennant Company | (1,378) | 23,696 | 11,013
Eliminations |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |
Net Earnings (Loss) Including Noncontrolling Interest | (31,850) | (34,001) | (24,464)
Other Comprehensive (Loss) Income: |  |  |
Foreign currency translation adjustments | 22,383 | (4,175) | (3,804)
Pension and retiree medical benefits | (1,197) | (538) | 1,691
Cash flow hedge | 0 | 0 | 0
Income Taxes: |  |  |
Foreign currency translation adjustments | (168) | (310) | (32)
Pension and retiree medical benefits | 205 | 99 | (296)
Cash flow hedge | 0 | 0 | 0
Total Other Comprehensive (Loss) Income, net of tax | 21,223 | (4,924) | (2,441)
Total Comprehensive Income Including Noncontrolling Interest | (10,627) | (38,925) |
Comprehensive Income (Loss) Attributable to Noncontrolling Interest | (126) | 10 |
Comprehensive Income Attributable to Tennant Company | $ (10,501) | $ (38,935) | $ (26,905)

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