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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, 2014 | $ 280,651 | $ 6,906 | $ 26,247 | $ 286,091 | $ (38,593) | $ 280,651 | $ 0
Balance (in shares) at Dec. 31, 2014 |  | 18,415,047 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Net (Loss) Earnings | 32,088 | $ 0 | 0 | 32,088 | 0 | 32,088 | 0
Other Comprehensive Income (Loss) | (9,536) | $ 0 | 0 | 0 | (9,536) | (9,536) | 0
Issue Stock for Directors, Employee Benefit and Stock Plans, net of related tax withholdings (23,160, 23,113 and 16,990 shares) (in shares) |  | 93,380 |  |  |  |  |
Issue Stock for Directors, Employee Benefit and Stock Plans, net of related tax withholdings (23,160, 23,113 and 16,990 shares) | 419 | $ 35 | 384 | 0 | 0 | 419 | 0
Share-Based Compensation | 8,222 | 0 | 8,222 | 0 | 0 | 8,222 | 0
Dividends paid ($0.80, $0.81 and $0.84) per Common Share | (14,498) | 0 | 0 | (14,498) | 0 | (14,498) | 0
Tax Benefit on Stock Plans | 859 | $ 0 | 859 | 0 | 0 | 859 | 0
Purchases of Common Stock (in shares) |  | (764,046) |  |  |  |  |
Purchases of Common Stock | (45,998) | $ (287) | (35,712) | (9,999) | 0 | (45,998) | 0
Balance (in shares) at Dec. 31, 2015 |  | 17,744,381 |  |  |  |  |
Ending balance at Dec. 31, 2015 | 252,207 | $ 6,654 | 0 | 293,682 | (48,129) | 252,207 | 0
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Net (Loss) Earnings | 46,614 | 0 | 0 | 46,614 | 0 | 46,614 | 0
Other Comprehensive Income (Loss) | (1,794) | $ 0 | 0 | 0 | (1,794) | (1,794) | 0
Issue Stock for Directors, Employee Benefit and Stock Plans, net of related tax withholdings (23,160, 23,113 and 16,990 shares) (in shares) |  | 190,443 |  |  |  |  |
Issue Stock for Directors, Employee Benefit and Stock Plans, net of related tax withholdings (23,160, 23,113 and 16,990 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 ($0.80, $0.81 and $0.84) 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 | 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 (Loss) Earnings | (6,205) | 0 | 0 | (6,195) | 0 | (6,195) | (10)
Other Comprehensive Income (Loss) | 27,600 | $ 0 | 0 | 0 | 27,600 | 27,600 | 0
Issue Stock for Directors, Employee Benefit and Stock Plans, net of related tax withholdings (23,160, 23,113 and 16,990 shares) (in shares) |  | 192,827 |  |  |  |  |
Issue Stock for Directors, Employee Benefit and Stock Plans, net of related tax withholdings (23,160, 23,113 and 16,990 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 ($0.80, $0.81 and $0.84) per Common Share | (14,953) | 0 | 0 | (14,953) | 0 | (14,953) | 0
Tax Benefit on Stock Plans | 2,028 | $ 0 | 0 | 0 | 0 | 0 | 2,028
Purchases of Common Stock (in shares) |  | 0 |  |  |  |  |
Purchases of Common Stock | (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

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