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Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Retained Earnings | Accumulated Other Comprehensive Loss | Tennant Company Shareholders' Equity | Noncontrolling Interest
--- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2015 | $ 252,207 | $ 6,654 | $ 0 | $ 293,682 | $ (48,129) | $ 252,207 | $ 0
Balance (in shares) at Dec. 31, 2015 |  | 17,744,381 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Net Earnings (Loss) | 46,614 | $ 0 | 0 | 46,614 | 0 | 46,614 | 0
Other Comprehensive (Loss) Income | (1,794) | $ 0 | 0 | 0 | (1,794) | (1,794) | 0
Issue Stock for Directors, Employee Benefit and Stock Plans, net of related tax withholdings (23,113, 16,990 and 9,598 shares) (in shares) |  | 190,443 |  |  |  |  |
Issue Stock for Directors, Employee Benefit and Stock Plans, net of related tax withholdings (23,113, 16,990 and 9,598 shares) | 4,010 | $ 71 | 3,939 | 0 | 0 | 4,010 | 0
Share-Based Compensation | 3,875 | 0 | 3,875 | 0 | 0 | 3,875 | 0
Dividends paid ($0.81, $0.84 and $0.85) per Common Share | (14,293) | 0 | 0 | (14,293) | 0 | (14,293) | 0
Tax Benefit on Stock Plans | 686 | $ 0 | 686 | 0 | 0 | 686 | 0
Purchases of Common Stock (in shares) |  | (246,474) |  |  |  |  |
Purchases of Common Stock | (12,762) | $ (92) | (4,847) | (7,823) | 0 | (12,762) | 0
Balance (in shares) at Dec. 31, 2016 |  | 17,688,350 |  |  |  |  |
Ending balance at Dec. 31, 2016 | 278,543 | $ 6,633 | 3,653 | 318,180 | (49,923) | 278,543 | 0
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Net Earnings (Loss) | (6,205) | 0 | 0 | (6,195) | 0 | (6,195) | (10)
Other Comprehensive (Loss) Income | 27,600 | $ 0 | 0 | 0 | 27,600 | 27,600 | 0
Issue Stock for Directors, Employee Benefit and Stock Plans, net of related tax withholdings (23,113, 16,990 and 9,598 shares) (in shares) |  | 192,827 |  |  |  |  |
Issue Stock for Directors, Employee Benefit and Stock Plans, net of related tax withholdings (23,113, 16,990 and 9,598 shares) | 5,617 | $ 72 | 5,545 | 0 | 0 | 5,617 | 0
Share-Based Compensation | 5,891 | 0 | 5,891 | 0 | 0 | 5,891 | 0
Dividends paid ($0.81, $0.84 and $0.85) per Common Share | (14,953) | 0 | 0 | (14,953) | 0 | (14,953) | 0
Recognition of Noncontrolling Interests | 2,028 | 0 | 0 | 0 | 0 | 0 | 2,028
Purchase of Noncontrolling Shareholder Interest | 30 | 0 | 0 | 0 | 0 | 0 | 30
Other | $ 17 | $ 0 | 0 | 0 | 0 | 0 | 17
Balance (in shares) at Dec. 31, 2017 | 17,881,177 | 17,881,177 |  |  |  |  |
Ending balance at Dec. 31, 2017 | $ 298,474 | $ 6,705 | 15,089 | 297,032 | (22,323) | 296,503 | 1,971
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Net Earnings (Loss) | 33,538 | 0 | 0 | 33,412 | 0 | 33,412 | 126
Other Comprehensive (Loss) Income | (14,871) | $ 0 | 0 | 0 | (14,871) | (14,871) | 0
Issue Stock for Directors, Employee Benefit and Stock Plans, net of related tax withholdings (23,113, 16,990 and 9,598 shares) (in shares) |  | 244,024 |  |  |  |  |
Issue Stock for Directors, Employee Benefit and Stock Plans, net of related tax withholdings (23,113, 16,990 and 9,598 shares) | 5,239 | $ 92 | 5,147 | 0 | 0 | 5,239 | 0
Share-Based Compensation | 8,314 | 0 | 8,314 | 0 | 0 | 8,314 | 0
Dividends paid ($0.81, $0.84 and $0.85) per Common Share | (15,343) | 0 | 0 | (15,343) | 0 | (15,343) | 0
Recognition of Noncontrolling Interests | (132) | 0 | 0 | 0 | 0 | 0 | (132)
Retained Earnings Adjustment | (1,168) | 0 | 0 | (1,168) | 0 | (1,168) | 0
Other | $ (35) | $ 0 | 0 | 0 | 0 | 0 | (35)
Balance (in shares) at Dec. 31, 2018 | 18,125,201 | 18,125,201 |  |  |  |  |
Ending balance at Dec. 31, 2018 | $ 316,352 | $ 6,797 | $ 28,550 | $ 316,269 | $ (37,194) | $ 314,422 | $ 1,930

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