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Retirement Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2017
Defined Contribution Plan [Abstract] |
Weighted-average asset allocations by asset category of the U.S. and U.K. Pension Plans | Weighted-average asset allocations by asset category of the U.K. Pension Plan and the Tennant Company Retirement Savings Plan are as of December 31, 2017 are as follows:
Asset Category | Fair Value |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
Cash and Cash Equivalents | $ | 6,305 |  |  | $ | 6,305 |  |  | $ | — |  |  | $ | — |
Investment Account held by Pension Plan(1) | 11,163 |  |  | — |  |  | — |  |  | 11,163 |
Total | $ | 17,468 |  |  | $ | 6,305 |  |  | $ | — |  |  | $ | 11,163 |
(1) | This category is comprised of investments in insurance contracts.
Weighted-average asset allocations by asset category of the U.S. and U.K. Pension Plans as of December 31, 2016 are as follows:
Asset Category | Fair Value |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
Cash and Cash Equivalents | $ | 663 |  |  | $ | 663 |  |  | $ | — |  |  | $ | — |
Mutual Funds: |  |  |  |  |  |  |  |  |  |  |
U.S. Large-Cap | 9,803 |  |  | 9,803 |  |  | — |  |  | — |
U.S. Small-Cap | 2,584 |  |  | 2,584 |  |  | — |  |  | — |
International Equities | 2,244 |  |  | 2,244 |  |  | — |  |  | — |
Fixed-Income Domestic | 4,564 |  |  | 4,564 |  |  | — |  |  | — |
Collective Investment Funds | 26,531 |  |  | — |  |  | 26,531 |  |  | — |
Investment Account held by Pension Plan(1) | 9,562 |  |  | — |  |  | — |  |  | 9,562 |
Total | $ | 55,951 |  |  | $ | 19,858 |  |  | $ | 26,531 |  |  | $ | 9,562 |
(1) | This category is comprised of investments in insurance contracts.
Reconciliation of beginning and ending balances of Level 3 plan assets | A reconciliation of the beginning and ending balances of the Level 3 investments of our U.K. Pension Plan during the years ended are as follows:
| 2017 |  | 2016
Fair value at beginning of year | $ | 9,562 |  |  | $ | 10,691 |
Purchases, sales, issuances and settlements, net | (535 | ) |  | 7 |
Net gain | 1,190 |  |  | 674 |
Foreign currency | 946 |  |  | (1,810 | )
Fair value at end of year | $ | 11,163 |  |  | $ | 9,562 |
Weighted-average assumptions used to determine benefit obligations and net periodic benefit costs | Weighted-average assumptions used to determine benefit obligations as of December 31 are as follows:
| U.S. Pension Benefits |  | Non-U.S. Pension Benefits |  | Postretirement Medical Benefits
| 2017 |  | 2016 |  | 2017 |  | 2016 |  | 2017 |  | 2016
Discount rate | 3.28 | % |  | 3.92 | % |  | 2.45 | % |  | 2.64 | % |  | 3.26 | % |  | 3.58 | %
Rate of compensation increase | — | % |  | 3.00 | % |  | 3.50 | % |  | 3.50 | % |  | — |  |  | — |
Weighted-average assumptions used to determine net periodic benefit costs as of December 31 are as follows:
| U.S. Pension Benefits |  | Non-U.S. Pension Benefits |  | Postretirement Medical Benefits
| 2017 |  | 2016 |  | 2015 |  | 2017 |  | 2016 |  | 2015 |  | 2017 |  | 2016 |  | 2015
Discount rate | 3.92 | % |  | 4.08 | % |  | 3.76 | % |  | 2.64 | % |  | 3.59 | % |  | 3.38 | % |  | 3.58 | % |  | 3.70 | % |  | 3.39 | %
Expected long-term rate of return on plan assets | 5.10 | % |  | 5.20 | % |  | 5.20 | % |  | 3.90 | % |  | 4.60 | % |  | 4.40 | % |  | — |  |  | — |  |  | — |
Rate of compensation increase | — | % |  | 3.00 | % |  | 3.00 | % |  | 3.50 | % |  | 3.50 | % |  | 3.50 | % |  | — |  |  | — |  |  | — |
Accumulated benefit obligations for all defined benefit plans | The accumulated benefit obligations as of December 31, for all defined benefit plans are as follows:
| 2017 |  | 2016
U.S. Pension Plans | $ | 1,414 |  |  | $ | 40,961 |
U.K. Pension Plan | 11,131 |  |  | 10,265 |
German Pension Plan | 1,013 |  |  | 871 |
Plans with accumulated benefit obligation in excess of plan assets | Information for our plans with an accumulated benefit obligation in excess of plan assets as of December 31 is as follows:
| 2017 |  | 2016
Accumulated benefit obligation | $ | 2,427 |  |  | $ | 12,597 |
Fair value of plan assets | — |  |  | 9,562 |
Plans with projected benefit obligations in excess of plan assets | Information for our plans with a projected benefit obligation in excess of plan assets as of December 31 is as follows:
| 2017 |  | 2016
Projected benefit obligation | $ | 2,427 |  |  | $ | 12,794 |
Fair value of plan assets | — |  |  | 9,562 |
Assumed healthcare cost trend rates | Assumed healthcare cost trend rates as of December 31 are as follows:
| 2017 |  | 2016
Healthcare cost trend rate assumption for the next year | 6.56 | % |  | 6.56 | %
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate) | 5.00 | % |  | 5.00 | %
Year that the rate reaches the ultimate trend rate | 2032 |  |  | 2031 |
Effect of one-percentage-point change in assumed healthcare cost trends | To illustrate, a one-percentage-point change in assumed healthcare cost trends would have the following effects:
| 1-Percentage- Point Decrease |  | 1-Percentage- Point Increase
Effect on total of service and interest cost components | $ | (31 | ) |  | $ | 35 |
Effect on postretirement benefit obligation | $ | (724 | ) |  | $ | 820 |
Changes in benefit obligations and plan assets and funded status | Summaries related to changes in benefit obligations and plan assets and to the funded status of our defined benefit and postretirement medical benefit plans are as follows:
| U.S. Pension Benefits |  | Non-U.S. Pension Benefits |  | Postretirement Medical Benefits
| 2017 |  | 2016 |  | 2017 |  | 2016 |  | 2017 |  | 2016
Change in benefit obligation: |  |  |  |  |  |  |  |  |  |  |
Benefit obligation at beginning of year | $ | 40,961 |  |  | $ | 41,774 |  |  | $ | 11,136 |  |  | $ | 10,883 |  |  | $ | 10,540 |  |  | $ | 11,144 |
Service cost | — |  |  | 354 |  |  | 132 |  |  | 103 |  |  | 60 |  |  | 76 |
Interest cost | 1,538 |  |  | 1,659 |  |  | 298 |  |  | 358 |  |  | 363 |  |  | 396 |
Plan participants' contributions | — |  |  | — |  |  | 14 |  |  | 14 |  |  | — |  |  | — |
Actuarial loss (gain) | 1,811 |  |  | 690 |  |  | 327 |  |  | 1,939 |  |  | (524 | ) |  | 6 |
Foreign exchange | — |  |  | — |  |  | 1,097 |  |  | (1,852 | ) |  | — |  |  | — |
Benefits paid | (1,950 | ) |  | (3,516 | ) |  | (860 | ) |  | (309 | ) |  | (835 | ) |  | (1,082 | )
Settlement | (40,946 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Benefit obligation at end of year | $ | 1,414 |  |  | $ | 40,961 |  |  | $ | 12,144 |  |  | $ | 11,136 |  |  | $ | 9,604 |  |  | $ | 10,540 |
Change in fair value of plan assets and net accrued liabilities:
Fair value of plan assets at beginning of year | $ | 46,389 |  |  | $ | 47,201 |  |  | $ | 9,562 |  |  | $ | 10,691 |  |  | $ | — |  |  | $ | — |
Actual return on plan assets | 2,536 |  |  | 2,457 |  |  | 1,189 |  |  | 673 |  |  | — |  |  | — |
Employer contributions | 276 |  |  | 247 |  |  | 313 |  |  | 303 |  |  | 835 |  |  | 1,082 |
Plan participants' contributions | — |  |  | — |  |  | 14 |  |  | 14 |  |  | — |  |  | — |
Excess assets transferred to Defined Contribution Plan | (6,305 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Foreign exchange | — |  |  | — |  |  | 945 |  |  | (1,810 | ) |  | — |  |  | — |
Benefits paid | (1,950 | ) |  | (3,516 | ) |  | (860 | ) |  | (309 | ) |  | (835 | ) |  | (1,082 | )
Settlement | (40,946 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Fair value of plan assets at end of year | — |  |  | 46,389 |  |  | 11,163 |  |  | 9,562 |  |  | — |  |  | — |
Funded status at end of year | $ | (1,414 | ) |  | $ | 5,428 |  |  | $ | (981 | ) |  | $ | (1,574 | ) |  | $ | (9,604 | ) |  | $ | (10,540 | )
Amounts recognized in the Consolidated Balance Sheets consist of:
Noncurrent Other Assets | $ | — |  |  | $ | 7,087 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Current Liabilities | (140 | ) |  | (239 | ) |  | (36 | ) |  | (30 | ) |  | (771 | ) |  | (828 | )
Long-Term Liabilities | (1,274 | ) |  | (1,420 | ) |  | (945 | ) |  | (1,544 | ) |  | (8,833 | ) |  | (9,712 | )
Net accrued asset (liability) | $ | (1,414 | ) |  | $ | 5,428 |  |  | $ | (981 | ) |  | $ | (1,574 | ) |  | $ | (9,604 | ) |  | $ | (10,540 | )
Amounts recognized in Accumulated Other Comprehensive Loss consist of:
Net actuarial loss | (915 | ) |  | (5,720 | ) |  | (1,245 | ) |  | (1,802 | ) |  | (41 | ) |  | (566 | )
Accumulated Other Comprehensive Loss | $ | (915 | ) |  | $ | (5,720 | ) |  | $ | (1,245 | ) |  | $ | (1,802 | ) |  | $ | (41 | ) |  | $ | (566 | )
Components of the net periodic benefit (credit) cost | The components of the net periodic benefit (credit) cost for the three years ended December 31 were as follows:
| U.S. Pension Benefits |  | Non-U.S. Pension Benefits |  | Postretirement Medical Benefits
| 2017 |  | 2016 |  | 2015 |  | 2017 |  | 2016 |  | 2015 |  | 2017 |  | 2016 |  | 2015
Service cost | $ | — |  |  | $ | 354 |  |  | $ | 480 |  |  | $ | 132 |  |  | $ | 103 |  |  | $ | 153 |  |  | $ | 60 |  |  | $ | 76 |  |  | $ | 96 |
Interest cost | 1,538 |  |  | 1,659 |  |  | 1,711 |  |  | 298 |  |  | 358 |  |  | 396 |  |  | 363 |  |  | 396 |  |  | 393 |
Expected return on plan assets | (2,336 | ) |  | (2,400 | ) |  | (2,613 | ) |  | (379 | ) |  | (452 | ) |  | (433 | ) |  | — |  |  | — |  |  | — |
Amortization of net actuarial loss | 43 |  |  | 41 |  |  | 835 |  |  | 74 |  |  | 27 |  |  | 54 |  |  | — |  |  | — |  |  | — |
Amortization of prior service cost | — |  |  | 41 |  |  | 42 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Foreign currency | — |  |  | — |  |  | — |  |  | (1 | ) |  | 97 |  |  | (35 | ) |  | — |  |  | — |  |  | — |
Net periodic benefit (credit) cost | (755 | ) |  | (305 | ) |  | 455 |  |  | 124 |  |  | 133 |  |  | 135 |  |  | 423 |  |  | 472 |  |  | 489 |
Curtailment charge | — |  |  | — |  |  | 25 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Settlement charge | 6,373 |  |  | — |  |  | 225 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Net benefit cost (credit) | $ | 5,618 |  |  | $ | (305 | ) |  | $ | 705 |  |  | $ | 124 |  |  | $ | 133 |  |  | $ | 135 |  |  | $ | 423 |  |  | $ | 472 |  |  | $ | 489 |
Changes in accumulated other comprehensive loss | The changes in Accumulated Other Comprehensive Loss for the three years ended December 31 were as follows:
| U.S. Pension Benefits |  | Non-U.S. Pension Benefits |  | Postretirement Medical Benefits
| 2017 |  | 2016 |  | 2015 |  | 2017 |  | 2016 |  | 2015 |  | 2017 |  | 2016 |  | 2015
Net actuarial loss (gain) | $ | 1,611 |  |  | $ | 633 |  |  | $ | 195 |  |  | $ | (465 | ) |  | $ | 1,718 |  |  | $ | (1,517 | ) |  | $ | (524 | ) |  | $ | 6 |  |  | $ | (1,618 | )
Amortization of prior service cost | — |  |  | (41 | ) |  | (67 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Amortization of net actuarial loss | (43 | ) |  | (41 | ) |  | (1,060 | ) |  | (74 | ) |  | (27 | ) |  | (54 | ) |  | — |  |  | — |  |  | — |
Settlement Charge | (6,373 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Total recognized in other comprehensive (income) loss | $ | (4,805 | ) |  | $ | 551 |  |  | $ | (932 | ) |  | $ | (539 | ) |  | $ | 1,691 |  |  | $ | (1,571 | ) |  | $ | (524 | ) |  | $ | 6 |  |  | $ | (1,618 | )
Total recognized in net benefit cost (credit) and other comprehensive (income) loss | $ | 813 |  |  | $ | 246 |  |  | $ | (227 | ) |  | $ | (415 | ) |  | $ | 1,824 |  |  | $ | (1,436 | ) |  | $ | (101 | ) |  | $ | 478 |  |  | $ | (1,129 | )
Expected future benefit payments | The following benefit payments, which reflect expected future service, are expected to be paid for our U.S. and Non-U.S. plans:
| U.S. Pension Benefits |  | Non-U.S. Pension Benefits |  | Postretirement Medical Benefits
2018 | $ | 140 |  |  | $ | 247 |  |  | $ | 771 |
2019 | 133 |  |  | 254 |  |  | 803 |
2020 | 132 |  |  | 261 |  |  | 849 |
2021 | 124 |  |  | 269 |  |  | 751 |
2022 | 117 |  |  | 278 |  |  | 741 |
2023 to 2027 | 493 |  |  | 1,538 |  |  | 3,509 |
Total | $ | 1,139 |  |  | $ | 2,847 |  |  | $ | 7,424 |
Amounts in accumulated other comprehensive loss to be recognized over next fiscal year | The following amounts are included in Accumulated Other Comprehensive Loss as of December 31, 2017 and are expected to be recognized as components of net periodic benefit cost during 2018:
| Pension Benefits |  | Postretirement Medical Benefits
Net actuarial loss | $ | 78 |  |  | $ | — |

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- Definition Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258 + Details
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- Definition Tabular disclosure of the major categories of plan assets of pension plans and/or other employee benefit plans. This information may include, but is not limited to, the target allocation of plan assets, the fair value of each major category of plan assets, and the level within the fair value hierarchy in which the fair value measurements fall. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2439-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2417-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2410-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=77993564&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the assumed health care cost trend rates for the next year used to measure the expected cost of benefits covered by the plans, including the ultimate trend rate(s) and when that rate is expected to be achieved. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (l) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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