Tennant (TNC) 10-K 28 Feb 19 2018 FY Annual report Financial data

Document and Entity Information

Document and Entity Information Document - USD ($)	12 Months Ended
	Dec. 31, 2018	Jan. 31, 2019	Jun. 30, 2018
Entity Information [Line Items]
Entity Registrant Name	Tennant Company
Entity Central Index Key	97,134
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Public Float			$ 1,404,892,960
Entity Common Stock, Shares Outstanding		18,119,093
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	FY
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2018
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Shell Company	false

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Statement [Abstract]
Net Sales	$ 1,123,511	$ 1,003,066	$ 808,572
Cost of Sales	678,478	603,253	456,977
Gross Profit	445,033	399,813	351,595
Operating Expense:
Research and Development Expense	30,739	32,013	34,738
Selling and Administrative Expense	356,316	334,782	248,592
Total Operating Expense	387,055	366,795	283,330
Profit from Operations	57,978	33,018	68,265
Other Income (Expense):
Interest Income	3,035	2,405	330
Interest Expense	(23,342)	(25,394)	(1,279)
Net Foreign Currency Transaction Losses	(1,100)	(3,387)	(392)
Other Expense, Net	(729)	(7,934)	(433)
Total Other Expense, Net	(22,136)	(34,310)	(1,774)
Profit (Loss) Before Income Taxes	35,842	(1,292)	66,491
Income Tax Expense	2,304	4,913	19,877
Net Earnings (Loss) Including Noncontrolling Interest	33,538	(6,205)	46,614
Net Earnings (Loss) Attributable to Noncontrolling Interest	126	(10)	0
Net Earnings (Loss) Attributable to Tennant Company	$ 33,412	$ (6,195)	$ 46,614
Net Earnings (Loss) Attributable to Tennant Company per Share:
Basic (in dollars per share)	$ 1.86	$ (0.35)	$ 2.66
Diluted (in dollars per share)	$ 1.82	$ (0.35)	$ 2.59
Weighted Average Shares Outstanding:
Basic (in shares)	17,940,438	17,695,390	17,523,267
Diluted (in shares)	18,338,569	17,695,390	17,976,183
Cash Dividends Declared per Common Share	$ 0.85	$ 0.84	$ 0.81

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
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

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current Assets:
Cash and Cash Equivalents	$ 85,609	$ 58,398
Restricted Cash	525	653
Receivables:
Trade, less Allowances of $2,516 and $3,241, respectively	207,948	203,280
Other	8,222	6,236
Net Receivables	216,170	209,516
Inventories	135,133	127,694
Prepaid Expenses	22,141	19,351
Other Current Assets	9,066	7,503
Total Current Assets	468,644	423,115
Property, Plant and Equipment	386,641	382,768
Accumulated Depreciation	(223,194)	(202,750)
Property, Plant and Equipment, Net	163,447	180,018
Deferred Income Taxes	15,489	11,134
Goodwill	182,671	186,044
Intangible Assets, Net	146,546	172,347
Other Assets	15,747	21,319
Total Assets	992,544	993,977
Current Liabilities:
Current Portion of Long-Term Debt	27,005	30,883
Accounts Payable	98,398	96,082
Employee Compensation and Benefits	49,453	37,257
Income Taxes Payable	2,123	2,838
Other Current Liabilities	71,895	69,447
Total Current Liabilities	248,874	236,507
Long-Term Liabilities:
Long-Term Debt	328,060	345,956
Employee-Related Benefits	21,110	23,867
Deferred Income Taxes	46,018	53,225
Other Liabilities	32,130	35,948
Total Long-Term Liabilities	427,318	458,996
Total Liabilities	676,192	695,503
Commitments and Contingencies (Note 17)
Equity:
Common Stock, $0.375 par value per share, 60,000,000 shares authorized; 18,125,201 and 17,881,177 issued and outstanding, respectively	6,797	6,705
Additional Paid-In Capital	28,550	15,089
Retained Earnings	316,269	297,032
Accumulated Other Comprehensive Loss	(37,194)	(22,323)
Total Tennant Company Shareholders' Equity	314,422	296,503
Noncontrolling Interest	1,930	1,971
Total Equity	316,352	298,474
Total Liabilities and Total Equity	$ 992,544	$ 993,977

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current Assets:
Allowance for Doubtful Receivables and Sales Returns	$ 2,516	$ 3,241
Equity:
Common Stock, par value (in dollars per share)	$ 0.375	$ 0.375
Common Stock, authorized (in shares)	60,000,000	60,000,000
Common Stock, issued (in shares)	18,125,201	17,881,177
Common Stock, outstanding (in shares)	18,125,201	17,881,177

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
OPERATING ACTIVITIES
Net Earnings (Loss) Including Noncontrolling Interest	$ 33,538	$ (6,205)	$ 46,614
Adjustments to Reconcile Net Earnings (Loss) to Net Cash Provided by Operating Activities:
Depreciation	32,291	26,199	17,891
Amortization of Intangible Assets	22,129	17,054	409
Amortization of Debt Issuance Costs	2,353	1,779	0
Debt Issuance Cost Charges Related to Short-Term Financing	0	6,200	0
Fair Value Step-Up Adjustment to Acquired Inventory	0	7,245	0
Deferred Income Taxes	(10,862)	(6,095)	(1,172)
Share-Based Compensation Expense	8,314	5,891	3,875
Allowance for Doubtful Accounts and Returns	768	1,602	468
Other, Net	(436)	364	(196)
Changes in Operating Assets and Liabilities, Net of Assets Acquired:
Receivables, Net	(7,618)	(14,381)	(9,278)
Inventories	(16,557)	(2,898)	23
Accounts Payable	4,569	10,849	(3,904)
Employee Compensation and Benefits	12,649	(7,780)	124
Other Current Liabilities	722	14,560	(185)
Income Taxes	(1,383)	285	5,427
Other Assets and Liabilities	(507)	(495)	(2,218)
Net Cash Provided by Operating Activities	79,970	54,174	57,878
INVESTING ACTIVITIES
Purchases of Property, Plant and Equipment	(18,780)	(20,437)	(26,526)
Proceeds from Disposals of Property, Plant and Equipment	112	2,511	615
Proceeds from Principal Payments Received on Long-Term Note Receivable	1,416	667	0
Issuance of Long-Term Note Receivable	0	(1,500)	(2,000)
Acquisitions of Businesses, Net of Cash Acquired	0	(354,073)	(12,933)
Purchase of Intangible Asset	(2,775)	(2,500)	0
Proceeds from Sale of Business	4,000	0	285
Net Cash Used in Investing Activities	(16,027)	(375,332)	(40,559)
FINANCING ACTIVITIES
Proceeds from Short-Term Debt	3,926	303,000	0
Repayments of Short-Term Debt	0	(303,000)	0
Proceeds from Issuance of Long-Term Debt	11,000	440,000	15,000
Payments of Long-Term Debt	(38,255)	(96,248)	(3,460)
Payments of Debt Issuance Costs	0	(16,482)	0
Change in Capital Lease Obligations	14	311	0
Purchases of Common Stock	0	0	(12,762)
Proceeds from Issuances of Common Stock	5,880	6,875	5,271
Excess Tax Benefit on Stock Plans	0	0	686
Purchase of Noncontrolling Owner Interest	0	(30)	0
Dividends Paid	(15,343)	(14,953)	(14,293)
Net Cash (Used in) Provided by Financing Activities	(32,778)	319,473	(9,558)
Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	(4,082)	2,186	(1,150)
NET INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	27,083	501	6,611
Cash, Cash Equivalents and Restricted Cash at Beginning of Year	59,051	58,550	51,939
CASH, CASH EQUIVALENTS, RESTRICTED CASH AND RESTRICTED CASH EQUIVALENTS AT END OF YEAR	86,134	59,051	58,550
Cash Paid During the Year for:
Income Taxes	11,132	13,542	14,172
Interest	22,367	14,228	1,135
Supplemental Non-Cash Investing and Financing Activities:
Long-Term Note Receivable from Sale of Business	0	0	5,489
Capital Expenditures in Accounts Payable	$ 2,311	$ 2,167	$ 2,045

Consolidated Statements of Shar

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

Consolidated Statements of Sh_2

Consolidated Statements of Shareholders' Equity (Parentheticals) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Stockholders' Equity [Abstract]
Tax withholdings for Directors, Employee Benefit and Stock Plans (in shares)	9,598	16,990	23,113
Dividends paid per Common Share (in dollars per share)	$ 0.85	$ 0.84	$ 0.81

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2018
Summary of Significant Accounting Policies [Abstract]
Significant Accounting Policies	1. Summary of Significant Accounting Policies Nature of Operations – Tennant Company is a world leader in designing, manufacturing and marketing solutions that empower customers to achieve quality cleaning performance, significantly reduce environmental impact and help create a cleaner, safer, healthier world. Tennant offers products and solutions consisting of mechanized cleaning equipment, detergent-free and other sustainable cleaning technologies, aftermarket parts and consumables, equipment maintenance and repair service, specialty surface coatings, and business solutions such as financing, rental and leasing programs, and machine-to-machine asset management solutions. Tennant products are used in many types of environments including: Retail establishments, distribution centers, factories and warehouses, public venues such as arenas and stadiums, office buildings, schools and universities, hospitals and clinics, parking lots and streets, and more. Customers include contract cleaners to whom organizations outsource facilities maintenance, as well as businesses that perform facilities maintenance themselves. The Company reaches these customers through the industry's largest direct sales and service organization and through a strong and well-supported network of authorized distributors worldwide. Consolidation – The Consolidated Financial Statements include the accounts of Tennant Company and its subsidiaries. All intercompany transactions and balances have been eliminated. In these Notes to the Consolidated Financial Statements, Tennant Company is referred to as “Tennant,” “we,” “us,” or “our.” Translation of Non-U.S. Currency – Foreign currency-denominated assets and liabilities have been translated to U.S. dollars at year-end exchange rates, while income and expense items are translated at average exchange rates prevailing during the year. Gains or losses resulting from translation are included as a separate component of Accumulated Other Comprehensive Loss. The balance of cumulative foreign currency translation adjustments recorded within Accumulated Other Comprehensive Loss as of December 31, 2018 , 2017 and 2016 was a net loss of $31,831 , $15,778 and $44,444 , respectively. The majority of translation adjustments are not adjusted for income taxes as substantially all translation adjustments relate to permanent investments in non-U.S. subsidiaries. Net Foreign Currency Transaction Losses are included in Other Income (Expense). Use of Estimates – In preparing the consolidated financial statements in conformity with U.S. generally accepted accounting principles ("U.S. GAAP"), management must make decisions that impact the reported amounts of assets, liabilities, revenues, expenses and the related disclosures, including disclosures of contingent assets and liabilities. Such decisions include the selection of the appropriate accounting principles to be applied and the assumptions on which to base accounting estimates. Estimates are used in determining, among other items, sales promotions and incentives accruals, inventory valuation, warranty reserves, allowance for doubtful accounts, pension and postretirement accruals, useful lives for intangible assets, and future cash flows associated with impairment testing for Goodwill and other long-lived assets. These estimates and assumptions are based on management’s best estimates and judgments. Management evaluates its estimates and assumptions on an ongoing basis using historical experience and other factors that management believes to be reasonable under the circumstances. We adjust such estimates and assumptions when facts and circumstances dictate. A number of these factors include, among others, economic conditions, credit markets, foreign currency, commodity cost volatility and consumer spending and confidence, all of which have combined to increase the uncertainty inherent in such estimates and assumptions. As future events and their effects cannot be determined with precision, actual amounts could differ significantly from those estimated at the time the consolidated financial statements are prepared. Changes in those estimates resulting from continuing changes in the economic environment will be reflected in the financial statements in future periods. Cash and Cash Equivalents – We consider all highly liquid investments with maturities of three months or less from the date of purchase to be cash equivalents. Restricted Cash – We have a total of $525 as of December 31, 2018 that serves as collateral backing certain bank guarantees and is therefore restricted. This money is invested in time deposits. Receivables – Credit is granted to our customers in the normal course of business. Receivables are recorded at original carrying value less reserves for estimated uncollectible accounts and sales returns. To assess the collectability of these receivables, we perform ongoing credit evaluations of our customers’ financial condition. Through these evaluations, we may become aware of a situation where a customer may not be able to meet its financial obligations due to deterioration of its financial viability, credit ratings or bankruptcy. The reserve requirements are based on the best facts available to us and are reevaluated and adjusted as additional information becomes available. Our reserves are also based on amounts determined by using percentages applied to trade receivables. These percentages are determined by a variety of factors including, but not limited to, current economic trends, historical payment and bad debt write-off experience. An account is considered past-due or delinquent when it has not been paid within the contractual terms. Uncollectible accounts are written off against the reserves when it is deemed that a customer account is uncollectible. Inventories – Inventories are valued at the lower of cost or net realizable value. Cost is determined on a first-in, first-out (“FIFO”) basis except for Inventories in North America, which are determined on a last-in, first-out (“LIFO”) basis. Property, Plant and Equipment – Property, plant and equipment is carried at cost. Additions and improvements that extend the lives of the assets are capitalized while expenditures for repairs and maintenance are expensed as incurred. We generally depreciate buildings and improvements by the straight-line method over a life of 30 years . Other property, plant and equipment are generally depreciated using the straight-line method based on lives of 3 years to 15 years . Equity Method Investment – Investments in which we have the ability to exercise significant influence, but do not control, are accounted for under the equity method of accounting and are included in Other Assets on the Consolidated Balance Sheets. Under this method of accounting, our share of the net earnings or losses of the investee are presented as a component of Other Expense, Net on the Consolidated Statements of Operations. The detail regarding our equity method investment in i-team North America B.V., a joint venture that operates as the distributor of the i-mop in North America, is further described in Note 5. Goodwill – Goodwill represents the excess of cost over the fair value of net assets of businesses acquired. We analyze Goodwill on an annual basis as of year-end and when an event occurs or circumstances change that may reduce the fair value of one of our reporting units below its carrying amount. A goodwill impairment occurs if the carrying amount of a reporting unit exceeds its fair value. In assessing the recoverability of Goodwill, we use an analysis of qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount as a basis for determining whether it is necessary to perform the quantitative impairment test. Intangible Assets – Intangible Assets consist of definite lived customer lists, trade names and technology. Generally, intangible assets classified as trade names are amortized on a straight-line basis and intangible assets classified as customer lists or technology are amortized using an accelerated method of amortization. Impairment of Long-lived Assets and Assets Held for Sale – We periodically review our intangible and long-lived assets for impairment and assess whether events or circumstances indicate that the carrying amount of the assets may not be recoverable. We generally deem an asset group to be impaired if an estimate of undiscounted future operating cash flows is less than its carrying amount. If impaired, an impairment loss is recognized based on the excess of the carrying amount of the individual asset group over its fair value. Assets held for sale are measured at the lower of their carrying value or fair value less costs to sell. Upon retirement or disposition, the asset cost and related accumulated depreciation or amortization are removed from the accounts and a gain or loss is recognized based on the difference between the fair value of proceeds received and carrying value of the assets held for sale. Purchase of Common Stock – We repurchase our Common Stock under 2016 and 2015 repurchase programs authorized by our Board of Directors. These programs allow us to repurchase up to an aggregate of 1,392,892 shares of our Common Stock. Upon repurchase, the par value is charged to Common Stock and the remaining purchase price is charged to Additional Paid-in Capital. If the amount of the remaining purchase price causes the Additional Paid-in Capital account to be in a debit position, this amount is then reclassified to Retained Earnings. Common Stock repurchased is included in shares authorized but is not included in shares outstanding. Warranty – We record a liability for estimated warranty claims at the time of sale. The amount of the liability is based on the trend in the historical ratio of claims to sales, the historical length of time between the sale and resulting warranty claim, new product introductions and other factors. In the event we determine that our current or future product repair and replacement costs exceed our estimates, an adjustment to these reserves would be charged to earnings in the period such determination is made. Warranty terms on machines range from one to four years. However, the majority of our claims are paid out within the first six to nine months following a sale. The majority of the liability for estimated warranty claims represents amounts to be paid out in the near term for qualified warranty issues, with immaterial amounts reserved to be paid out for older equipment warranty issues. Warranty costs are recorded as a component of Selling and Administrative Expense in the Consolidated Statements of Operations. Debt Issuance Costs – We record all applicable debt issuance costs related to a recognized debt liability in the Consolidated Balance Sheets as a direct deduction from the carrying amount of the debt liability, if not a line-of-credit arrangement. All debt issuance costs related to line-of-credit arrangements are recorded as part of Other Assets in the Consolidated Balance Sheets and subsequently amortized over the term of the line-of-credit arrangement. We amortize our debt issuance costs using the effective interest method over the term of the debt instrument or line-of-credit arrangement. Amortization of these costs is included as part of Interest Expense in the Consolidated Statements of Operations. Environmental – We record a liability for environmental clean-up on an undiscounted basis when a loss is probable and can be reasonably estimated. Pension and Profit Sharing Plans – Substantially all U.S. employees are covered by various retirement benefit plans, including postretirement medical plans and defined contribution savings plans. Pension plan costs are accrued based on actuarial estimates with the required pension cost funded annually, as needed. No new participants have entered the defined benefit pension plan since 2000 and no new participants have entered the postretirement medical plan since 1998. For further details regarding our pension and profit sharing plans, see Note 15. Postretirement Benefits – We accrue and recognize the cost of retiree health benefits over the employees’ period of service based on actuarial estimates. Benefits are only available for U.S. employees hired before January 1, 1999. Derivative Financial Instruments – In countries outside the U.S., we transact business in U.S. dollars and in various other currencies. We hedge our net recognized foreign currency denominated assets and liabilities with foreign exchange forward contracts to reduce the risk that the value of these assets and liabilities will be adversely affected by changes in exchange rates. We may also use foreign exchange option contracts or forward contracts to hedge certain cash flow exposures resulting from changes in foreign currency exchange rates. We enter into these foreign exchange contracts to hedge a portion of our forecasted currency denominated revenue in the normal course of business, and accordingly, they are not speculative in nature. We account for our foreign currency hedging instruments as either assets or liabilities on the balance sheet and measure them at fair value. Gains and losses resulting from changes in fair value are accounted for depending on the use of the derivative and whether it is designated and qualifies for hedge accounting. Gains and losses from foreign exchange forward contracts that hedge certain balance sheet positions are recorded each period to Net Foreign Currency Transaction Losses in our Consolidated Statements of Operations. Foreign exchange option contracts or forward contracts hedging forecasted foreign currency revenue are designated as cash flow hedges under accounting for derivative instruments and hedging activities, with gains and losses recorded each period to Accumulated Other Comprehensive Loss in our Consolidated Balance Sheets, until the forecasted transaction occurs. When the forecasted transaction occurs, we reclassify the related gain or loss on the cash flow hedge to Net Sales. In the event the underlying forecasted transaction does not occur, or it becomes probable that it will not occur, we reclassify the gain or loss on the related cash flow hedge from Accumulated Other Comprehensive Loss to Net Foreign Currency Transaction Losses in our Consolidated Statements of Operations at that time. If we do not elect hedge accounting, or the contract does not qualify for hedge accounting treatment, the changes in fair value from period to period are recorded in Net Foreign Currency Transaction Losses in our Consolidated Statements of Operations. See Note 13 for additional information regarding our hedging activities. Revenue Recognition – Revenue is recognized upon transfer of control of promised products or services to customers in an amount that reflects the consideration we expect to receive in exchange for those products and services. Generally, these criteria are met at the time the product is shipped. We also enter into contracts that can include combinations of products and services, which are generally capable of being distinct and are accounted for as separate performance obligations. Revenue is recognized net of allowances for returns and any taxes collected from customers, which are subsequently remitted to governmental authorities. Further details regarding revenue recognition are discussed in Notes 2 and 4. Share-based Compensation – We account for employee share-based compensation using the fair value based method. Our share-based compensation plans are more fully described in Note 19. Research and Development – Research and development costs are expensed as incurred. Advertising Costs – We advertise products, technologies and solutions to customers and prospective customers through a variety of marketing campaign and promotional efforts. These efforts include tradeshows, online advertising, e-mail marketing, mailings, sponsorships and telemarketing. Advertising costs are expensed as incurred. In 2018 , 2017 and 2016 , such activities amounted to $8,767 , $8,228 and $7,269 , respectively. Income Taxes – Deferred tax assets and liabilities are recognized for the expected future tax consequences of temporary differences between the book and tax bases of existing assets and liabilities. A valuation allowance is provided when, in management’s judgment, it is more likely than not that some portion or all of the deferred tax asset will not be realized. We have established contingent tax liabilities using management’s best judgment. We follow guidance provided by Accounting Standards Codification ("ASC") 740, Income Taxes , regarding uncertainty in income taxes, to record these contingent tax liabilities (refer to Note 18 for additional information). We adjust these liabilities as facts and circumstances change. Interest Expense is recognized in the first period the interest would begin accruing. Penalties are recognized in the period we claim or expect to claim the position in our tax return. Interest and penalty expenses are classified as an income tax expense. Sales Tax – Sales taxes collected from customers and remitted to governmental authorities are presented on a net basis. Earnings per Share – Basic earnings (loss) per share is computed by dividing Net Earnings (Loss) Attributable to Tennant Company by the Weighted Average Shares Outstanding during the period. Diluted earnings per share assumes conversion of potentially dilutive stock options, performance shares, restricted shares and restricted stock units. These conversions are not included in our computation of diluted earnings per share if we have a net loss attributable to Tennant Company in a reporting period, as the effects are anti-dilutive. New Accounting Pronouncements - In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) . This ASU changes current U.S. GAAP for lessees to recognize lease assets and lease liabilities on the balance sheet for those leases classified as operating leases under previous U.S. GAAP. Under the new guidance, lessor accounting is largely unchanged. The amendments in this ASU are effective for annual periods beginning after December 15, 2018, including interim periods within that reporting period, which is our fiscal 2019. We have elected to apply the standard on a prospective basis with an adjustment to retained earnings in the first period of adoption. We have also elected the package of practical expedients, which permits us not to reassess our prior conclusions about lease identification, lease classification and initial direct costs. In addition, we have elected the short-term lease recognition whereby we will not recognize operating lease related assets or liabilities for leases with a lease term less than one year. We have also elected to not separate lease and non-lease components for all of our leases. We will not be electing the hindsight practical expedient to determine the reasonably certain term of existing leases. We are continuing to evaluate the impact of this amended guidance on our consolidated financial statements and related disclosures. We expect the adoption of this standard will have a material impact on the consolidated balance sheets for recognition of operating lease related assets and liabilities. We do not expect a material impact to the consolidated statements of operations. We are unable to quantify the impact at this time as the lease software required to calculate the impact due to the volume of our lease data has not yet been implemented. We are also in the process of implementing controls to ensure compliance with the new lease accounting standard. We expect to be complete with implementation activities by the end of the first quarter of 2019 and will provide appropriate disclosures at that time.

Newly Adopted Accounting Pronou

Newly Adopted Accounting Pronouncements (Notes)	12 Months Ended
	Dec. 31, 2018
Accounting Changes and Error Corrections [Abstract]
Newly Adopted Accounting Pronouncements	2. Newly Adopted Accounting Pronouncements Revenue from Contracts with Customers On January 1, 2018, we adopted Accounting Standards Update ("ASU") No. 2014-09, Revenue from Contracts with Customers (Topic 606) and all the related amendments ("new revenue standard") to all contracts not completed at the date of initial application using the modified retrospective method. The cumulative effect of initially applying the new revenue standard as an adjustment to the opening balance of retained earnings was not material to the company. The comparative information has not been restated and continues to be reported under the accounting standards in effect for those periods, and there are no material differences between the reported results under the new revenue standard and those that would have been reported under legacy U.S. GAAP. The new revenue standard also required us to record a refund liability and a corresponding asset for our right to recover products from customers upon settling the refund liability to account for the transfer of products with a right of return. The impact of this provision of the new revenue standard is immaterial to our financial statements. The new revenue standard also provided additional clarity that resulted in a reclassification from the Accounts Receivable to Other Current Liabilities to reflect a change in the presentation of our sales return reserves on the balance sheet, which were previously recorded net of Accounts Receivable. Provisions for estimated sales returns will continue to be recorded at the time the related revenue is recognized. The reclassification from Accounts Receivable to Other Current Liabilities in accordance with the detail described above impacted the Condensed Consolidated Balance Sheet as of December 31, 2018, as follows (in thousands): As Reported Balance Without Adoption of ASC 606 Effect of Change Higher/(Lower) ASSETS Accounts Receivable $ 216,170 $ 214,858 $ 1,312 Total Current Assets 468,644 467,332 $ 1,312 Total Assets $ 992,544 $ 991,232 $ 1,312 LIABILITIES Other Current Liabilities $ 71,895 $ 70,583 $ 1,312 Total Current Liabilities 248,874 247,562 $ 1,312 Total Liabilities $ 676,192 $ 674,880 $ 1,312 Intra-Entity Transfers of Assets Other than Inventory On January 1, 2018, we adopted ASU No. 2016-16, Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other than Inventory. The ASU requires the tax effects of all intra-entity sales of assets other than inventory to be recognized in the period in which the transaction occurs. The adoption of this ASU resulted in a $94 cumulative effect adjustment recorded in Retained Earnings as of the beginning of 2018 that reflects a $1,281 reduction in a long-term deferred charge, mostly offset by the establishment of deferred tax assets of $1,187 . The reduction in the long-term asset and establishment of the deferred tax asset impacted Other Assets and Deferred Income Taxes, respectively, on our Condensed Consolidated Balance Sheets. Statement of Cash Flows – Restricted Cash On January 1, 2018, we adopted ASU No. 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash. The ASU requires companies to explain the changes in the combined total of restricted and unrestricted balances in the Condensed Consolidated Statements of Cash Flows. Therefore, amounts generally described as restricted cash or restricted cash equivalents should be combined with unrestricted cash and cash equivalents when reconciling the beginning and end of period balances on the Condensed Consolidated Statement of Cash Flows. In accordance with the ASU, we adopted the standard on a retrospective basis to all periods presented. Compensation – Retirement Benefits On January 1, 2018, we adopted ASU No. 2017-07, Compensation—Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost . The ASU requires employers to report the service cost component of net pension and postretirement benefit costs in the same line item or items as other compensation costs arising from services rendered by the pertinent employees during the period. The other components of net pension and postretirement benefit costs are required to be presented in the Condensed Consolidated Statements of Operations separately from the service cost component in nonoperating expenses. In accordance with the ASU, we adopted the standard on a retrospective basis to all periods presented. As a result, we reclassified $5,974 of net benefit costs and $233 of net benefit credits from Selling and Administrative Expense to Other Expense, Net on the Condensed Consolidated Statements of Operations for the twelve months ended December 31, 2017 and December 31, 2016, respectively. The reclassification represents the other components of net pension and postretirement benefit costs that are now presented in the Condensed Consolidated Statements of Operations separately from the service cost in Total Other Expense, Net. As a basis for the retrospective application of the ASU, we used the practical expedient that permits us to use the amounts disclosed for the various components of net benefit cost in Note 15. Income Statement – Reporting Comprehensive Income On January 1, 2018, we elected to adopt early ASU No. 2018-02, Income Statement—Reporting Comprehensive Income (Topic 220) . The ASU gives companies the option to reclassify stranded tax effects caused by the newly enacted legislation referred to as the Tax Cuts and Jobs Act (the "Tax Act") from Accumulated Other Comprehensive Loss to Retained Earnings. The adoption resulted in a $1,262 cumulative effect adjustment which increased Retained Earnings as of the beginning of 2018 and reduced the deferred income tax benefits in Accumulated Other Comprehensive Loss relating to cash flow hedges and pension and retiree medical benefits. Income Taxes In March 2018, we adopted ASU No. 2018-05, Income Taxes (Topic 740): Amendments to SEC paragraphs Pursuant to SEC Staff Accounting Bulletin No. 118. The ASU updates the income tax accounting in U.S. GAAP to reflect the SEC interpretive guidance released on December 22, 2017, when the Tax Act was signed into law. Additional information regarding the adoption of this standard is contained in Note 18.

Revision of Prior Period Financ

Revision of Prior Period Financial Statements (Notes)	12 Months Ended
	Dec. 31, 2017
Accounting Changes and Error Corrections [Abstract]
Accounting Changes and Error Corrections [Text Block]	3. Revision of Prior Period Financial Statements Subsequent to the issuance of our consolidated financial statements for the quarter and year-to-date periods ended September 30, 2018, management identified misclassifications between Cost of Sales and Selling and Administrative Expense in our Consolidated Statements of Operations. As a result of revising prior period financial statement amounts for these misclassifications, Cost of Sales increased $4,608 and Selling and Administrative Expense decreased $4,608 for the year ended December 31, 2017. There were no misclassifications identified for the year ended December 31, 2016. These revisions had no impact on Profit (Loss) Before Income Taxes. The revisions also had no impact on our Consolidated Statements of Comprehensive Income, Consolidated Statements of Equity, Consolidated Balance Sheets, or Consolidated Statements of Cash Flow. Management evaluated the materiality of the revisions from a quantitative and qualitative perspective and concluded that the revisions are immaterial to our consolidated financial statements. Revisions to amounts in previously filed quarterly financial statements from 2018 and 2017 are reflected in Note 22.

Revenue from Contracts with Cus

Revenue from Contracts with Customers (Notes)	12 Months Ended
	Dec. 31, 2018
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer [Text Block]	4. Revenue from Contracts with Customers Under the new revenue standard, revenue is recognized when control transfers under the terms of the contract with our customers. Revenue is measured as the amount of consideration we expect to receive in exchange for transferring goods or providing services. Sales and other taxes we collect concurrent with revenue-producing activities are excluded from revenue. We do not account for shipping and handling as a distinct performance obligation as we generally perform shipping and handling activities after we transfer control of goods to the customer. We have elected to account for shipping and handling costs associated with outbound freight after control of goods has transferred to a customer as a fulfillment cost. Incidental items that are immaterial in the context of the contract are not recognized as a separate performance obligation. We do not have any significantly extended payment terms as payment is generally received within one year of the point of sale. In general, we transfer control and recognize a sale at the point in time when products are shipped from our manufacturing facilities both direct to consumers and to distributors. Service revenue is recognized in the period the service is performed or ratably over the period of the related service contract. Consideration related to service contracts is deferred if the proceeds are received in advance of the satisfaction of the performance obligations and recognized over the contract period as the performance obligation is met. We use an output method to measure progress toward completion for certain prepaid service contracts, as this method appropriately depicts performance towards satisfaction of the performance obligations. For contracts with multiple performance obligations (i.e., a product and service component), we allocate the transaction price to the performance obligations in proportion to their stand-alone selling prices. We use an observable price to determine the stand-alone selling price for separate performance obligations. When allocating on a relative stand-alone selling price basis, any discounts contained within the contract are allocated proportionately to all of the performance obligations in the contract. Disaggregation of Revenue The following tables illustrate the disaggregation of revenue by geographic area, groups of similar products and services and sales channels for the twelve months ended December 31, 2018 , 2017 and 2016 (in thousands): Net Sales by geographic area Twelve Months Ended December 31 2018 2017 2016 Americas $ 690,996 $ 640,274 $ 607,026 Europe, Middle East and Africa 335,603 273,738 129,046 Asia Pacific 96,912 89,054 72,500 Total $ 1,123,511 $ 1,003,066 $ 808,572 Net Sales are attributed to each geographic area based on the end user country and are net of intercompany sales. Net Sales by groups of similar products and services Twelve Months Ended December 31 2018 2017 2016 Equipment $ 729,993 $ 636,875 $ 491,075 Parts and Consumables 222,345 202,452 173,632 Specialty Surface Coatings 29,827 31,407 29,146 Service and Other 141,346 132,332 114,719 Total $ 1,123,511 $ 1,003,066 $ 808,572 Net Sales by sales channel Twelve Months Ended December 31 2018 2017 2016 Sales Direct to Consumer $ 735,244 $ 674,495 $ 609,538 Sales to Distributors 388,267 328,571 199,034 Total $ 1,123,511 $ 1,003,066 $ 808,572 Contract Liabilities Sales Returns The right of return may exist explicitly or implicitly with our customers. When the right of return exists, we adjust the transaction price for the estimated effect of returns. We estimate the expected returns using the expected value method by assessing historical sales levels and the timing and magnitude of historical sales return levels as a percent of sales and projecting this experience into the future. Sales Incentives Our sales contracts may contain various customer incentives, such as volume-based rebates or other promotions. We reduce the transaction price for certain customer programs and incentive offerings that represent variable consideration. Sales incentives given to our customers are recorded using the most likely amount approach for estimating the amount of consideration to which the company will be entitled. We forecast the most likely amount of the incentive to be paid at the time of sale, update this forecast quarterly, and adjust the transaction price accordingly to reflect the new amount of incentives expected to be earned by the customer. A majority of our customer incentives are settled within one year. We record our accruals for volume-based rebates and other promotions in Other Current Liabilities on our Condensed Consolidated Balance Sheets. The change in our sales incentive accrual balance for the twelve months ended December 31, 2018 was as follows: Twelve Months Ended December 31 2018 Beginning balance $ 13,466 Additions to sales incentive accrual 30,458 Contract payments (26,992 ) Foreign currency fluctuations (280 ) Ending balance $ 16,652 Deferred Revenue We sell separately priced prepaid contracts to our customers where we receive payment at the inception of the contract and defer recognition of the consideration received because we have to satisfy future performance obligations. Our deferred revenue balance is primarily attributed to prepaid maintenance contracts on our machines ranging from 12 months to 60 months . In circumstances where prepaid contracts are sold simultaneously with machines, we use an observable price to determine stand-alone selling price for separate performance obligations. The change in the deferred revenue balance for the twelve months ended December 31, 2018 was as follows: Twelve Months Ended December 31 2018 Beginning balance $ 7,787 Increase in deferred revenue representing our obligation to satisfy future performance obligations 14,650 Decrease in deferred revenue for amounts recognized in Net Sales for satisfied performance obligations (13,755 ) Foreign currency fluctuations (157 ) Ending balance $ 8,525 At December 31, 2018 , $5,021 and $3,504 of deferred revenue was reported in Other Current Liabilities and Other Liabilities, respectively, on our Condensed Consolidated Balance Sheets. Of this, we expect to recognize the following approximate amounts in Net Sales in the following periods: 2019 $ 5,021 2020 1,865 2021 1,044 2022 442 2023 153 Thereafter — Total $ 8,525 At December 31, 2017, $5,815 and $2,483 of deferred revenue was reported in Other Current Liabilities and Other Liabilities, respectively, on our Condensed Consolidated Balance Sheets. Practical Expedients and Exemptions We generally expense the incremental costs of obtaining a contract when incurred because the amortization period would be less than one year. These costs relate primarily to sales commissions and are recorded in Selling and Administrative Expense in the Condensed Consolidated Statements of Operations. We do not disclose the value of unsatisfied performance obligations for contracts with an original expected length of one year or less. In addition, we do not adjust the promised amount of consideration for the effects of a significant financing component if we expect, at contract inception, that the period between when we transfer a promised good or service to a customer and when the customer pays for that good or service will be one year or less.

Investment in Joint Venture

Investment in Joint Venture	12 Months Ended
	Dec. 31, 2018
Related Party Transactions [Abstract]
Investment in Joint Venture	5. Investment in Joint Venture On February 13, 2017, the Company, through a Dutch subsidiary, together with Future Cleaning Technologies, B.V., a company headquartered in the Netherlands, announced the January 1, 2017 formation of i-team North America B.V., a joint venture that operates as the distributor of the i-mop in North America. We began selling and servicing the i-mop in the second quarter of 2017. We own a 50% ownership interest in the joint venture, which is accounted for under the equity method of accounting, with our proportionate share of income or loss presented as a component of Other Expense, Net on the Consolidated Statements of Operations. In 2018 , this amount was immaterial. As of December 31, 2018 , the carrying value of the company's investment in the joint venture was $32 . In March 2017, we issued a $1,500 loan to the joint venture and, as a result, recorded a long-term note receivable in Other Assets on the Consolidated Balance Sheets.

Management Actions (Notes)

Management Actions (Notes)	12 Months Ended
	Dec. 31, 2018
Restructuring and Related Activities [Abstract]
Restructuring and Related Activities Disclosure	6. Management Actions During the first quarter of 2017 , we implemented a restructuring action to better align our global resources and expense structure with a lower growth global economic environment. The pre-tax charge of $8,018 , including other associated costs of $961 , consisted primarily of severance and was included within Selling and Administrative Expense in the Consolidated Statements of Operations. The charge impacted our Americas, Europe, Middle East and Africa ("EMEA") and Asia Pacific ("APAC") operating segments. We estimated the savings would offset the pre-tax charge approximately one year from the date of the action. No additional costs will be incurred related to this restructuring action. During the fourth quarter of 2017 , we implemented a restructuring action primarily driven by integration actions related to our acquisition of IP Cleaning S.p.A and its subsidiaries ("IPC Group"). See Note 7 for further details regarding our acquisition of the IPC Group. The restructuring action consisted primarily of severance and includes reductions in overall staffing to streamline and right-size the organization to support anticipated business requirements. The pre-tax charge of $2,501 was included within Selling and Administrative Expense in the Consolidated Statements of Operations. The charge impacted our Americas, EMEA and APAC operating segments. We estimated the savings would offset the pre-tax charge approximately one year from the date of the action. During the fourth quarter of 2018 , we implemented a restructuring action consisting of severance to further our integration efforts related to the IPC Group. The pre-tax charge of $1,032 was included within Selling and Administrative Expense in the Consolidated Statements of Operations. The charge impacted our EMEA and APAC operating segments. We estimate the savings will offset the pre-tax charge approximately one year from the date of the action. A reconciliation to the ending liability balance of severance and related costs as of December 31, 2018 is as follows: Severance and Related Costs 2017 restructuring actions $ 9,558 Cash payments (6,312 ) Foreign currency adjustments 190 December 31, 2017 Balance 3,436 2018 charges and utilization: New charges 1,032 Cash payments (2,123 ) Foreign currency adjustments (97 ) December 31, 2018 Balance $ 2,248

Acquisitions (Notes)

Acquisitions (Notes)	12 Months Ended
	Dec. 31, 2017
Business Combinations [Abstract]
Acquisitions	7. Acquisitions and Divestitures Waterstar During the third quarter of 2018, we sold substantially all of the assets of our Waterstar business for $4,000 in cash. The resulting gain was approximately $1,000 and is reflected within Selling and Administrative Expense in operating profit in our Consolidated Statements of Operations. IP Cleaning S.p.A. On April 6, 2017, we acquired nearly 100 percent of the outstanding capital stock of IPC Group for a purchase price of $353,769 , net of cash acquired of $8,804 . The primary seller was Ambienta SGR S.p.A., a European private equity fund. IPC Group, based in Italy, is a designer and manufacturer of innovative professional cleaning equipment, cleaning tools and supplies. The acquisition strengthens our presence and market share in Europe and will allow us to better leverage our EMEA cost structure. We funded the acquisition of IPC Group, along with related fees, including refinancing of existing debt, with funds raised through borrowings under a senior secured credit facility in an aggregate principal amount of $420,000 . Further details regarding our acquisition financing arrangements are discussed in Note 11. The following table summarizes the final fair value measurement of the assets acquired and liabilities assumed as of the date of acquisition: ASSETS Receivables $ 39,984 Inventories 46,442 Other Current Assets 7,456 Assets Held for Sale 2,247 Property, Plant and Equipment 63,890 Intangible Assets Subject to Amortization: Trade Name 26,753 Customer Lists 123,061 Technology 9,631 Other Assets 2,000 Total Identifiable Assets Acquired 321,464 LIABILITIES Accounts Payable 32,227 Accrued Expenses 18,130 Deferred Income Taxes 56,950 Other Liabilities 10,964 Total Identifiable Liabilities Assumed 118,271 Net Identifiable Assets Acquired 203,193 Noncontrolling Interest (1,896 ) Goodwill 152,472 Total Estimated Purchase Price, net of Cash Acquired $ 353,769 Based on the final fair value measurement of the assets acquired and liabilities assumed, we allocated $152,472 to goodwill for the expected synergies from combining IPC Group with our existing business. None of the goodwill is expected to be deductible for income tax purposes. In connection with the finalization of the fair value measurements in the first quarter of 2018, we recorded a measurement period adjustment, which increased goodwill by $4,627 with offsetting adjustments to various income tax assets and liabilities. The final fair value of the acquired intangible assets is $159,445 . The expected lives of the acquired amortizable intangible assets are approximately 15 years for customer lists, 10 years for trade names and 10 years for technology. Trade names are being amortized on a straight-line basis while the customer lists and technology are being amortized on an accelerated basis. We recorded amortization expense of $20,794 in Selling and Administrative Expense on our Consolidated Statements of Operations for these acquired intangible assets for the twelve months ended December 31, 2018 . The following unaudited pro forma financial information presents the combined results of operations of Tennant Company as if the acquisition of IPC Group had occurred as of January 1, 2016: Years ended December 31 2017 2016 Net Sales Pro forma $ 1,057,127 $ 1,013,710 As reported 1,003,066 808,572 Net Earnings (Loss) Attributable to Tennant Company Pro forma $ 12,288 $ 30,412 As reported (6,195 ) 46,614 Net Earnings (Loss) Attributable to Tennant Company per Diluted Share Pro forma $ 0.68 $ 1.69 As reported (0.35 ) 2.59 The unaudited pro forma financial information is presented for informational purposes only. It is not necessarily indicative of what our consolidated results of operations actually would have been had the acquisition occurred at the beginning of each year, nor does it attempt to project the future results of operations of the combined company. The unaudited pro forma financial information above gives effect to the following: • Incremental depreciation and amortization expense related to the fair value of the property, plant and equipment and identified intangible assets; • Exclusion of the purchase accounting impact of the inventory step-up related to the sale of acquired inventory; • Incremental interest expense related to additional debt used to finance the acquisition; • Exclusion of non-recurring acquisition-related transaction and financing costs; and • Pro forma adjustments tax affected based on the jurisdiction where the costs were incurred.

Inventories

Inventories	12 Months Ended
	Dec. 31, 2018
Inventory Disclosure [Abstract]
Inventories	8. Inventories Inventories as of December 31 consisted of the following: 2018 2017 Inventories carried at LIFO: Finished goods $ 48,607 $ 43,439 Raw materials, production parts and work-in-process 28,581 23,694 Excess of FIFO over LIFO cost (a) (31,199 ) (28,429 ) Total LIFO inventories $ 45,989 $ 38,704 Inventories carried at FIFO: Finished goods $ 53,520 $ 54,161 Raw materials, production parts and work-in-process 35,624 34,829 Total FIFO inventories $ 89,144 $ 88,990 Total inventories $ 135,133 $ 127,694 (a) Inventories of $45,989 as of December 31, 2018, and $38,704 as of December 31, 2017, were valued at LIFO. The difference between replacement cost and the stated LIFO inventory value is not materially different from the reserve for the LIFO valuation method.

Property, Plant and Equipment

Property, Plant and Equipment	12 Months Ended
	Dec. 31, 2018
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	9. Property, Plant and Equipment Property, Plant and Equipment and related Accumulated Depreciation, including equipment under capital leases, as of December 31, consisted of the following: 2018 2017 Property, Plant and Equipment: Land $ 17,857 $ 18,152 Buildings and improvements 93,729 96,230 Machinery and manufacturing equipment 154,118 151,645 Office equipment 111,219 107,312 Work in progress 9,718 9,429 Total Property, Plant and Equipment 386,641 382,768 Less: Accumulated Depreciation (223,194 ) (202,750 ) Property, Plant and Equipment, Net $ 163,447 $ 180,018 Depreciation expense was $32,291 in 2018 , $26,199 in 2017 and $17,891 in 2016 .

Goodwill and Intangible Assets

Goodwill and Intangible Assets	12 Months Ended
	Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	10. Goodwill and Intangible Assets For purposes of performing our goodwill impairment analysis, we have identified our reporting units as North America, Latin America, Coatings, EMEA and APAC. As of December 31, 2018 , 2017 and 2016 , we performed an analysis of qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount as a basis for determining whether it is necessary to perform the quantitative goodwill impairment test. Based on our analysis of qualitative factors, we determined that it was not more likely than not that the fair value of the North America, Latin America, EMEA and APAC reporting units was less than its respective carrying amount. We elected to perform a quantitative analysis of the Coatings reporting unit. Based on the quantitative analysis of that reporting unit, it was determined there was no goodwill impairment at December 31, 2018. The changes in the carrying amount of Goodwill are as follows: Goodwill Accumulated Impairment Losses Total Balance as of December 31, 2016 $ 58,397 $ (37,332 ) $ 21,065 Additions 147,845 — 147,845 Purchase accounting adjustments (1,865 ) — (1,865 ) Foreign currency fluctuations 22,847 (3,848 ) 18,999 Balance as of December 31, 2017 $ 227,224 $ (41,180 ) $ 186,044 Additions — — — Purchase accounting adjustments 4,627 — 4,627 Foreign currency fluctuations (10,141 ) 2,142 (8,000 ) Balance as of December 31, 2018 $ 221,710 $ (39,038 ) $ 182,671 The balances of acquired Intangible Assets, excluding Goodwill, as of December 31, are as follows: Customer Lists Trade Names Technology Total Balance as of December 31, 2018 Original cost $ 143,059 $ 30,592 $ 17,436 $ 191,087 Accumulated amortization (33,714 ) (5,327 ) (5,500 ) (44,541 ) Carrying amount $ 109,345 $ 25,265 $ 11,936 $ 146,546 Weighted-average original life (in years) 15 10 10 Balance as of December 31, 2017 Original cost $ 149,355 $ 31,968 $ 14,589 $ 195,912 Accumulated amortization (17,870 ) (2,436 ) (3,259 ) (23,565 ) Carrying amount $ 131,485 $ 29,532 $ 11,330 $ 172,347 Weighted-average original life (in years) 15 10 11 The purchase accounting adjustments recorded during the first quarter of 2018 were based on the fair value adjustments related to our acquisition of the IPC Group, as described further in Note 7. In 2018 , our purchased intangible assets were $2,775 , which was primarily due to a technology license. The license was recorded in Intangible Assets, Net as technology on the Condensed Consolidated Balance Sheets as of December 31, 2018 . Amortization expense on Intangible Assets was $22,129 , $17,054 and $409 for the years ended December 31, 2018 , 2017 and 2016 , respectively. Estimated aggregate amortization expense based on the current carrying amount of amortizable Intangible Assets for each of the five succeeding years is as follows: 2019 $ 21,297 2020 19,873 2021 18,092 2022 15,913 2023 14,352 Thereafter 57,019 Total $ 146,546

Debt

Debt	12 Months Ended
	Dec. 31, 2018
Debt Disclosure [Abstract]
Debt	11. Debt Credit Facility Borrowings 2017 Credit Agreement In 2017, the Company and certain of our foreign subsidiaries entered into a Credit Agreement (the "2017 Credit Agreement") with JPMorgan, as administrative agent, Goldman Sachs Bank USA, as syndication agent, Wells Fargo, National Association, U.S. Bank National Association, and HSBC Bank USA, National Association, as co-documentation agents, and the lenders (including JPMorgan) from time to time party thereto. The 2017 Credit Agreement contains customary representations, warranties and covenants, including, but not limited to, covenants restricting the company’s ability to incur indebtedness and liens and merge or consolidate with another entity. The 2017 Credit Agreement also contains financial covenants, requiring us to maintain a ratio of consolidated total indebtedness to consolidated earnings before income, taxes, depreciation and amortization, subject to certain adjustments ("Adjusted EBITDA") of not greater than 4.00 to 1, as well as requiring us to maintain a ratio of consolidated Adjusted EBITDA to consolidated interest expense of no less than 3.50 to 1 for the year ended December 31, 2018 . The 2017 Credit Agreement also contains a financial covenant requiring us to maintain a senior secured net indebtedness to Adjusted EBITDA ratio of not greater than 3.50 to 1. These financial covenants may restrict our ability to pay dividends and purchase outstanding shares of our common stock. We were in compliance with our financial covenants at December 31, 2018 . In October 2018, the Company signed Amendment No. 1 to the 2017 Credit Agreement, which clarified that the adoption of the new lease accounting standard in 2019 would have no effect on any financial covenant calculations. Effective with our fiscal year ended December 31, 2018, we are required to repay the senior credit agreement with 25% to 50% of our excess cash flow from the preceding fiscal year, as defined in the agreement, unless our net leverage ratio for such preceding fiscal year is less than or equal to 3.00 to 1. Our Senior Notes also contain certain restrictions, which are generally less restrictive than those contained in the 2017 Credit Agreement. Senior Unsecured Notes On April 18, 2017, we issued and sold $300,000 in aggregate principal amount of our 5.625% Senior Notes due 2025 (the “Notes”), pursuant to an Indenture, dated as of April 18, 2017, among the company, the Guarantors (as defined therein), and Wells Fargo Bank, National Association, a national banking association, as trustee. The Notes are guaranteed by Tennant Coatings, Inc., and Tennant Sales and Service Company (collectively, the “Guarantors”), which are wholly-owned subsidiaries of the company. Separate financial information of the Guarantors is presented in Note 23. The Notes will mature on May 1, 2025. Interest on the Notes accrues at the rate of 5.625% per annum and is payable semiannually in cash on each May 1 and November 1, commencing on November 1, 2017. The Notes and the guarantees constitute senior unsecured obligations of the company and the Guarantors, respectively. The Notes and the guarantees, respectively, are: (a) equal in right of payment with all of the company’s and the Guarantors’ senior debt, without giving effect to collateral arrangements; (b) senior in right of payment to all of the company’s and the Guarantors’ future subordinated debt, if any; (c) effectively subordinated in right of payment to all of the company’s and the Guarantors’ debt and obligations that are secured, including borrowings under the company’s senior secured credit facilities for so long as the senior secured credit facilities are secured, to the extent of the value of the assets securing such liens; and (d) structurally subordinated in right of payment to all liabilities (including trade payables) of the company’s and the Guarantors’ subsidiaries that do not guarantee the Notes. The Notes also contain customary representations, warranties and covenants, and are less restrictive than those contained in the 2017 Credit Agreement. We used the net proceeds from this offering to refinance a $300,000 term loan under our 2017 Credit Agreement that we borrowed as part of the financing for the acquisition of the IPC Group and to pay related fees and expenses. The Indenture governing the Notes contains covenants that limit, among other things, our ability and the ability of our restricted subsidiary to incur additional indebtedness (including guarantees thereof); incur or create liens on assets securing indebtedness; make certain restricted payments; make certain investments; dispose of certain assets; allow to exist certain restrictions on the ability of our restricted subsidiaries to pay dividends or make other payments to us; engage in certain transactions with affiliates; and consolidate or merge with or into other companies. If we experience certain kinds of changes of control, we may be required to repurchase the Notes at a price equal to 101% of the principal amount of the Notes, plus accrued and unpaid interest, if any, to, but excluding, the date of repurchase. If we make certain asset sales and do not use the net proceeds for specified purposes, we may be required to offer to repurchase the Notes at a price equal to 100% of the principal amount, plus accrued and unpaid interest, if any, to, but excluding, the date of repurchase. Registration Rights Agreement In connection with the issuance and sale of the Notes, the company entered into a Registration Rights Agreement, dated April 18, 2017, among the company, the Guarantors and Goldman, Sachs & Co. and J.P. Morgan Securities LLC (the “Registration Rights Agreement”). Pursuant to the Registration Rights Agreement, the company agreed (1) to use its commercially reasonable efforts to consummate an exchange offer to exchange the original Senior Notes for new registered notes (the "Exchange Notes"), with terms substantially identical in all material respects with the Original Notes (except that the Exchange Notes will not contain terms with respect to additional interest, registration rights or transfer restrictions) and (2) if required, to have a shelf registration statement declared effective with respect to resales of the Senior Notes. On January 22, 2018, we commenced the exchange offer required by the Registration Rights Agreement. The exchange offer closed on February 23, 2018. We did not incur any additional indebtedness as a result of the exchange offer. As a result, we were not required to pay additional interest on the Senior Notes. Capital Lease Obligations Capital lease obligations outstanding are primarily related to sale-leaseback transactions with third-party leasing companies whereby we sell our manufactured equipment to the leasing company and lease it back. The equipment covered by these leases is rented to our customers over the lease term. Debt outstanding at December 31, consisted of the following: 2018 2017 Bank Borrowings $ 3,926 $ — Senior Unsecured Notes 300,000 300,000 Credit Facility Borrowings 53,000 80,000 Capital Lease Obligations 2,863 3,279 Unamortized Debt Issuance Costs (4,724 ) (6,440 ) Total Debt 355,065 376,839 Less: Current Maturities of Credit Facility Borrowings, Net of Debt Issuance Costs (1) (27,005 ) (30,883 ) Long-term portion $ 328,060 $ 345,956 (1) Current maturities of debt include $25,927 of current maturities, less $184 of unamortized debt issuance costs, under our 2017 Credit Agreement and $1,262 of current maturities of capital lease obligations. As of December 31, 2018 , we had outstanding borrowings under our Senior Unsecured Notes of $300,000 . We had outstanding borrowings under our 2017 Credit Agreement, totaling $22,000 under our term loan facility and $31,000 under our revolving facility. In addition, we had letters of credit and bank guarantees outstanding in the amount of $3,279 , leaving approximately $165,721 of unused borrowing capacity on our revolving facility. Although we are only required to make a minimum principal payment of $6,875 during 2019, we have both the intent and the ability to pay an additional $15,125 during 2019. As such, we have classified $22,000 as current maturities of long-term debt. Commitment fees on unused lines of credit for the year ended December 31, 2018 were $595 . The overall weighted average cost of debt is approximately 5.4% and, net of a related cross-currency swap instrument, is approximately 4.5% . Further details regarding the cross-currency swap instrument are discussed in Note 13. The aggregate maturities of our outstanding debt, excluding unamortized debt issuance costs, as of December 31, 2018 , are as follows: 2019 $ 12,066 2020 10,297 2021 6,255 2022 31,171 2023 — Thereafter 300,000 Total aggregate maturities $ 359,789

Other Current Liabilities

Other Current Liabilities	12 Months Ended
	Dec. 31, 2018
Other Liabilities, Current [Abstract]
Other Current Liabilities	12. Other Current Liabilities Other Current Liabilities as of December 31 consisted of the following: 2018 2017 Other Current Liabilities: Taxes, other than income taxes $ 12,763 $ 14,760 Warranty 13,062 12,676 Deferred revenue 5,021 5,815 Rebates 16,652 13,466 Freight 4,475 3,208 Restructuring 2,248 4,267 Miscellaneous accrued expenses 13,117 10,779 Other 4,557 4,476 Total Other Current Liabilities $ 71,895 $ 69,447 The changes in warranty reserves for the three years ended December 31 were as follows: 2018 2017 2016 Beginning balance $ 12,676 $ 10,960 $ 10,093 Product warranty provision 13,172 12,124 12,413 Acquired warranty obligations — 1,208 42 Foreign currency (172 ) 274 82 Claims paid (12,614 ) (11,890 ) (11,670 ) Ending balance $ 13,062 $ 12,676 $ 10,960

Derivatives (Notes)

Derivatives (Notes)	12 Months Ended
	Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Hedging	13. Derivatives Hedge Accounting and Hedging Programs In 2015, we expanded our foreign currency hedging programs to include foreign exchange purchased options and forward contracts to hedge our foreign currency denominated revenue. We recognize all derivative instruments as either assets or liabilities in our Consolidated Balance Sheets and measure them at fair value. Gains and losses resulting from changes in fair value are accounted for depending on the use of the derivative and whether it is designated and qualifies for hedge accounting. We evaluate hedge effectiveness on our hedges that are designated and qualify for hedge accounting at the inception of the hedge prospectively, as well as retrospectively, and record any ineffective portion of the hedging instruments in Net Foreign Currency Transaction Losses on our Consolidated Statements of Operations. The time value of purchased contracts is recorded in Net Foreign Currency Transaction Losses in our Consolidated Statements of Operations. Our hedging policy establishes maximum limits for each counterparty to mitigate any concentration of risk. Balance Sheet Hedging Hedges of Foreign Currency Assets and Liabilities We hedge our net recognized foreign currency denominated assets and liabilities with foreign exchange forward contracts to reduce the risk that the value of these assets and liabilities will be adversely affected by changes in exchange rates. These contracts hedge assets and liabilities that are denominated in foreign currencies and are carried at fair value as either assets or liabilities on the Consolidated Balance Sheets with changes in the fair value recorded to Net Foreign Currency Transaction Losses in our Consolidated Statements of Operations. These contracts do not subject us to material balance sheet risk due to exchange rate movements because gains and losses on these derivatives are intended to offset gains and losses on the assets and liabilities being hedged. At December 31, 2018 and December 31, 2017 , the notional amounts of foreign currency forward exchange contracts outstanding not designated as hedging instruments were $63,410 and $60,858 , respectively. During the first quarter of 2017, in connection with our acquisition of IPC Group, we entered into a foreign currency option contract not designated as a hedging instrument for a notional amount of €180,000 . The option contract has since expired and there were no outstanding foreign currency option contracts not designated as hedging instruments as of December 31, 2018 and December 31, 2017 . Cash Flow Hedging Hedges of Forecasted Foreign Currency Transactions In countries outside the U.S., we transact business in U.S. dollars and in various other currencies. We may use foreign exchange option contracts or forward contracts to hedge certain cash flow exposures resulting from changes in these foreign currency exchange rates. These foreign exchange contracts, carried at fair value, have maturities of up to one year . We enter into these foreign exchange contracts to hedge a portion of our forecasted foreign currency denominated revenue in the normal course of business, and accordingly, they are not speculative in nature. The notional amount of outstanding foreign currency forward contracts designated as cash flow hedges were $0 and $2,928 as of December 31, 2018 and December 31, 2017 , respectively. The notional amount of outstanding foreign currency option contracts designated as cash flow hedges was $8,436 and $8,619 as of December 31, 2018 and December 31, 2017 , respectively. Foreign Currency Derivatives We use foreign currency exchange rate derivatives to hedge our exposure to fluctuations in exchange rates for anticipated intercompany cash transactions between Tennant Company and its subsidiaries. During 2017, we entered into Euro to U.S. dollar foreign exchange cross currency swaps for all of the anticipated cash flows associated with an intercompany loan from a wholly-owned European subsidiary. We entered into these foreign exchange cross currency swaps to hedge the foreign currency denominated cash flows associated with this intercompany loan, and accordingly, they are not speculative in nature. We designated these cross currency swaps as cash flow hedges. The hedged cash flows as of December 31, 2018 included €174,000 of total notional value. As of December 31, 2018 , the aggregate scheduled interest payments over the course of the loan and related swaps amounted to €24,000 . The scheduled maturity and principal payment of the loan and related swaps of €150,000 are due in April 2022 . There were no new cross currency swaps designated as cash flow hedges as of December 31, 2018 . To receive hedge accounting treatment, all hedging relationships are formally documented at the inception of the hedge, and the hedges must be highly effective in offsetting changes to future cash flows on hedged transactions. We record changes in the fair value of these cash flow hedges in Accumulated Other Comprehensive Loss in our Consolidated Balance Sheets, until the forecasted transaction occurs. When the forecasted transaction occurs, we reclassify the related gain or loss on the cash flow hedge to Net Sales. In the event the underlying forecasted transaction does not occur, or it becomes probable that it will not occur, we reclassify the gain or loss on the related cash flow hedge from Accumulated Other Comprehensive Loss to Net Foreign Currency Transaction Losses in our Consolidated Statements of Operations at that time. If we do not elect hedge accounting, or the contract does not qualify for hedge accounting treatment, the changes in fair value from period to period are recorded in Net Foreign Currency Transaction Losses in our Consolidated Statements of Operations. The fair value of derivative instruments on our Consolidated Balance Sheets as of December 31 consisted of the following: 2018 2017 Fair Value Asset Derivatives Fair Value Liability Derivatives Fair Value Asset Derivatives Fair Value Liability Derivatives Derivatives designated as hedging instruments: Foreign currency option contracts (1) $ 245 $ — $ 86 $ — Foreign currency forward contracts (1) 6,987 25,415 7,218 34,961 Derivatives not designated as hedging instruments: Foreign currency forward contracts (1) $ 223 $ — $ 442 $ 425 (1) Contracts that mature within the next 12 months are included in Other Current Assets and Other Current Liabilities for asset derivatives and liabilities derivatives, respectively, on our Consolidated Balance Sheets. Contracts with maturities greater than 12 months are included in Other Assets and Other Liabilities for asset derivatives and liability derivatives, respectively, in our Consolidated Balance Sheets. Amounts included in our Consolidated Balance Sheets are recorded net where a right of offset exists with the same derivative counterparty. As of December 31, 2018 , we anticipate reclassifying approximately $2,367 of gains from Accumulated Other Comprehensive Loss to n et earnings during the next 12 months. The effect of foreign currency derivative instruments designated as cash flow hedges and foreign currency derivative instruments not designated as hedges in our Consolidated Statements of Earnings for the three years ended December 31 were as follows: 2018 2017 2016 Foreign Currency Option Contracts Foreign Currency Forward Contracts Foreign Currency Option Contracts Foreign Currency Forward Contracts Foreign Currency Option Contracts Foreign Currency Forward Contracts Derivatives in cash flow hedging relationships: Net gain (loss) recognized in Other Comprehensive Income (Loss), net of tax (1) $ 100 $ 9,025 $ (193 ) $ (16,226 ) $ (259 ) $ (73 ) Net (loss) gain reclassified from Accumulated Other Comprehensive Loss into earnings, net of tax, effective portion to Net Sales (110 ) (18 ) (178 ) (37 ) (148 ) 7 Net gain reclassified from Accumulated Other Comprehensive Loss in earnings, net of tax, effective portion to Interest Income — 1,870 — 1,198 — — Net gain (loss) reclassified from Accumulated Other Comprehensive Loss into earnings, net of tax, effective portion to Net Foreign Currency Transaction Losses — 6,353 — (12,555 ) — — Net gain (loss) recognized in earnings (2) 8 12 (13 ) 10 (11 ) 2 Derivatives not designated as hedging instruments: Net loss recognized in earnings (3) $ — $ (2,518 ) $ — $ (6,161 ) $ — $ (890 ) (1) Net change in the fair value of the effective portion classified in Other Comprehensive Income (Loss). (2) Ineffective portion and amount excluded from effectiveness testing classified in Net Foreign Currency Transaction Losses. (3) Classified in Net Foreign Currency Transaction Losses.

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Fair Value Measurements	14. Fair Value Measurements Estimates of fair value for financial assets and financial liabilities are based on the framework established in the accounting guidance for fair value measurements. The framework defines fair value, provides guidance for measuring fair value and requires certain disclosures. The framework discusses valuation techniques, such as the market approach (comparable market prices), the income approach (present value of future income or cash flow) and the cost approach (cost to replace the service capacity of an asset or replacement cost). The framework utilizes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value into three broad levels. The following is a brief description of those three levels: • Level 1: Observable inputs such as quoted prices (unadjusted) in active markets for identical assets or liabilities. • Level 2: Inputs other than quoted prices that are observable for the asset or liability, either directly or indirectly. These include quoted prices for similar assets or liabilities in active markets and quoted prices for identical or similar assets or liabilities in markets that are not active. • Level 3: Unobservable inputs that reflect the reporting entity’s own assumptions. Our population of assets and liabilities subject to fair value measurements at December 31, 2018 is as follows: Fair Value Level 1 Level 2 Level 3 Assets: Foreign currency forward exchange contracts $ 7,210 $ — $ 7,210 $ — Foreign currency option contracts 245 — 245 — Total Assets $ 7,455 $ — $ 7,455 $ — Liabilities: Foreign currency forward exchange contracts $ 25,415 $ — $ 25,415 $ — Total Liabilities $ 25,415 $ — $ 25,415 $ — Our population of assets and liabilities subject to fair value measurements at December 31, 2017 is as follows: Fair Value Level 1 Level 2 Level 3 Assets: Foreign currency forward exchange contracts $ 7,660 $ — $ 7,660 $ — Foreign currency option contracts 86 — 86 — Total Assets $ 7,746 $ — $ 7,746 $ — Liabilities: Foreign currency forward exchange contracts $ 35,386 $ — $ 35,386 $ — Total Liabilities $ 35,386 $ — $ 35,386 $ — Our foreign currency forward exchange and option contracts are valued using observable Level 2 market expectations at the measurement date and standard valuation techniques to convert future amounts to a single present value amount. Further details regarding our foreign currency forward exchange and option contracts are discussed in Note 13. The carrying amounts reported in the Consolidated Balance Sheets for Cash and Cash Equivalents, Restricted Cash, Receivables, Other Current Assets, Accounts Payable and Other Current Liabilities approximate fair value due to their short-term nature. The fair market value of our Long-Term Debt approximates cost based on the borrowing rates currently available to us for bank loans with similar terms and remaining maturities. From time to time, we measure certain assets at fair value on a non-recurring basis, including evaluation of long-lived assets, goodwill and other intangible assets, as part of a business acquisition. These assets are measured and recognized at amounts equal to the fair value determined as of the date of acquisition. Fair value valuations are based on the information available as of the acquisition date and the expectations and assumptions that have been deemed reasonable by us. There are inherent uncertainties and management judgment required in these determinations. The fair value measurements of assets acquired and liabilities assumed as part of a business acquisition are based on valuations involving significant unobservable inputs, or Level 3, in the fair value hierarchy. These assets are also subject to periodic impairment testing by comparing the respective carrying value of each asset to the estimated fair value of the reporting unit or asset group in which they reside. In the event we determine these assets to be impaired, we would recognize an impairment loss equal to the amount by which the carrying value of the reporting unit, impaired asset or asset group exceeds its estimated fair value. These periodic impairment tests utilize company-specific assumptions involving significant unobservable inputs, or Level 3, in the fair value hierarchy.

Retirement Benefit Plans

Retirement Benefit Plans	12 Months Ended
	Dec. 31, 2018
Defined Contribution Plan [Abstract]
Retirement Benefit Plans	15. Retirement Benefit Plans Substantially all U.S. employees are covered by various retirement benefit plans, including postretirement medical plans and defined contribution savings plans. Retirement benefits for eligible employees in foreign locations are funded principally through defined benefit plans, annuity or government programs. The total cost of benefits for our plans was $11,926 , $13,253 and $12,108 in 2018 , 2017 and 2016 , respectively. We had a qualified, funded defined benefit retirement plan (the “U.S. Pension Plan”) covering certain current and retired employees in the U.S. During 2015, the plan was amended to freeze benefits for all participants effective January 31, 2017 . On February 15, 2017 , the Board of Directors approved the termination of the U.S. Pension Plan, effective May 15, 2017 . Participants who elected an immediate lump sum distribution were paid out in December 2017. Assets for participants who elected or are currently receiving annuity payments and those who have elected to defer their benefits were transferred to the annuity company, Pacific Life, in December 2017. Excess assets were transferred from the Tennant Company Pension Trust to the Tennant Company Retirement Savings Plan to deliver future discretionary benefits to plan participants. As of December 31, 2018 , we held excess assets of $6,408 for future discretionary benefit payments. We have a U.S. postretirement medical benefit plan (the “U.S. Retiree Plan”) to provide certain healthcare benefits for U.S. employees hired before January 1, 1999. Eligibility for those benefits is based upon a combination of years of service with us and age upon retirement. Our defined contribution savings plan (“401(k)”) covers substantially all U.S. employees. Under this plan, we match up to 3% of the employee’s annual compensation in cash to be invested per their election. We also make a profit sharing contribution to the 401(k) plan for employees with more than one year of service in accordance with our Profit Sharing Plan. This contribution is based upon our financial performance and can be funded in the form of Tennant stock, cash or a combination of both. Expenses for the 401(k) plan were $8,073 , $4,404 and $8,359 during 2018 , 2017 and 2016 , respectively. We have a U.S. nonqualified supplemental benefit plan (the “U.S. Nonqualified Plan”) to provide additional retirement benefits for certain employees whose benefits under our 401(k) plan or U.S. Pension Plan are limited by either the Employee Retirement Income Security Act or the Internal Revenue Code. We also have defined benefit pension plans in the United Kingdom and Germany (the “U.K. Pension Plan” and the “German Pension Plan”). The U.K. Pension Plan and German Pension Plan cover certain current and retired employees and both plans are closed to new participants. In December 2018, the U.K. Pension Plan was amended to close all future accrual of benefits to existing active members, resulting in a curtailment gain of $165 relating to past service benefits. We expect to contribute approximately $146 to our U.S. Nonqualified Plan, $779 to our U.S. Retiree Plan, $360 to our U.K. Pension Plan and $34 to our German Pension Plan in 2019 . Weighted-average asset allocations by asset category of the U.K. Pension Plan and the Tennant Company Retirement Savings Plan as of December 31, 2018 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 $ 6,408 $ 6,408 $ — $ — Investment Account held by Pension Plan (1) 10,842 — — 10,842 Total $ 17,250 $ 6,408 $ — $ 10,842 (1) This category is comprised of investments in insurance contracts. Weighted-average asset allocations by asset category of the U.K. Pension Plan and the Tennant Company Retirement Savings Plan 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. Estimates of the fair value of the U.K Pension Plan and the Tennant Company Retirement Savings Plan assets are based on the framework established in the accounting guidance for fair value measurements. A brief description of the three levels can be found in Note 14. The Investment Account held by the U.K. Pension Plan invests in insurance contracts for purposes of funding the U.K. Pension Plan and is classified as Level 3. The fair value of the Investment Account is the cash surrender values as determined by the provider which are the amounts the plan would receive if the contracts were cashed out at year end. The underlying assets held by these contracts are primarily invested in assets traded in active markets. A reconciliation of the beginning and ending balances of the Level 3 investments of our U.K. Pension Plan during the years ended December 31 are as follows: 2018 2017 Fair value at beginning of year $ 11,163 $ 9,562 Purchases, sales, issuances and settlements, net (856 ) (535 ) Net gain 1,138 1,190 Foreign currency (603 ) 946 Fair value at end of year $ 10,842 $ 11,163 The primary objective of our U.K. Pension Plan is to meet retirement income commitments to plan participants at a reasonable cost to us and to maintain a sound actuarially funded status. This objective is accomplished through growth of capital and safety of funds invested. Assets are invested in securities to achieve growth of capital over inflation through appreciation and accumulation and reinvestment of dividend and interest income. Investments are diversified to control risk. The U.K. Pension Plan is invested in insurance contracts with underlying investments primarily in equity and fixed income securities. Our German Pension Plan is unfunded, which is customary in that country. 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 2018 2017 2018 2017 2018 2017 Discount rate 3.95 % 3.28 % 2.72 % 2.45 % 3.95 % 3.26 % Rate of compensation increase — % — % 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 2018 2017 2016 2018 2017 2016 2018 2017 2016 Discount rate 3.28 % 3.92 % 4.08 % 2.45 % 2.64 % 3.59 % 3.26 % 3.58 % 3.70 % Expected long-term rate of return on plan assets — % 5.10 % 5.20 % 3.80 % 3.90 % 4.60 % — — — Rate of compensation increase — % — % 3.00 % 3.50 % 3.50 % 3.50 % — — — The discount rate is used to discount future benefit obligations back to today’s dollars. Our discount rates were determined based on high-quality fixed income investments. The resulting discount rates are consistent with the duration of plan liabilities. The FTSE (formerly known as Citigroup) Above Median Spot Rates for high-quality corporate bonds are used in determining the discount rate for the U.S. Plans. The expected return on assets assumption on the investment portfolios for the pension plans is based on the long-term expected returns for the investment mix of assets currently in the portfolio. Management uses historic return trends of the asset portfolio combined with recent market conditions to estimate the future rate of return. The accumulated benefit obligations as of December 31 for all defined benefit plans are as follows: 2018 2017 U.S. Pension Plans $ 1,267 $ 1,414 U.K. Pension Plan 9,264 11,131 German Pension Plan 950 1,013 Information for our plans with an accumulated benefit obligation in excess of plan assets as of December 31 is as follows: 2018 2017 Accumulated benefit obligation $ 2,217 $ 2,427 Fair value of plan assets — — As of December 31, 2018 and 2017 , the U.S. Nonqualified and the German Pension Plans had an accumulated benefit obligation 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: 2018 2017 Projected benefit obligation $ 2,217 $ 2,427 Fair value of plan assets — — As of December 31, 2018 and 2017 , the U.S. Nonqualified and the German Pension Plans had a projected benefit obligation in excess of plan assets. Assumed healthcare cost trend rates as of December 31 are as follows: 2018 2017 Healthcare cost trend rate assumption for the next year 6.38 % 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 2032 Assumed healthcare cost trend rates have a significant effect on the amounts reported for healthcare plans. 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 $ (26 ) $ 29 Effect on postretirement benefit obligation $ (599 ) $ 672 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 2018 2017 2018 2017 2018 2017 Change in benefit obligation: Benefit obligation at beginning of year $ 1,414 $ 40,961 $ 12,144 $ 11,136 $ 9,604 $ 10,540 Service cost — — 126 132 45 60 Interest cost 43 1,538 280 298 293 363 Plan participants' contributions — — 13 14 — — Plan amendments — — 109 — — — Actuarial loss (gain) 35 1,811 (514 ) 327 (485 ) (524 ) Foreign exchange — — (583 ) 1,097 — — Benefits paid (149 ) (1,950 ) (1,196 ) (860 ) (844 ) (835 ) Settlement (76 ) (40,946 ) — — — — Curtailment — — (165 ) — — — Benefit obligation at end of year $ 1,267 $ 1,414 $ 10,214 $ 12,144 $ 8,613 $ 9,604 Change in fair value of plan assets and net accrued liabilities: Fair value of plan assets at beginning of year $ — $ 46,389 $ 11,163 $ 9,562 $ — $ — Actual return on plan assets — 2,536 1,138 1,189 — — Employer contributions 225 276 327 313 844 835 Plan participants' contributions — — 13 14 — — Excess assets transferred to Defined Contribution Plan — (6,305 ) — — — — Foreign exchange — — (603 ) 945 — — Benefits paid (149 ) (1,950 ) (1,196 ) (860 ) (844 ) (835 ) Settlement (76 ) (40,946 ) — — — — Fair value of plan assets at end of year — — 10,842 11,163 — — Funded status at end of year $ (1,267 ) $ (1,414 ) $ 628 $ (981 ) $ (8,613 ) $ (9,604 ) Amounts recognized in the Consolidated Balance Sheets consist of: Noncurrent Other Assets $ — $ — $ 1,578 $ — $ — $ — Current Liabilities (146 ) (140 ) (34 ) (36 ) (779 ) (771 ) Long-Term Liabilities (1,121 ) (1,274 ) (916 ) (945 ) (7,834 ) (8,833 ) Net accrued (liability) asset $ (1,267 ) $ (1,414 ) $ 628 $ (981 ) $ (8,613 ) $ (9,604 ) Amounts recognized in Accumulated Other Comprehensive Loss consist of: Prior service cost $ — $ — $ (109 ) $ — $ — $ — Net actuarial (loss) gain (852 ) (915 ) 42 (1,245 ) 444 (41 ) Accumulated Other Comprehensive (Loss) Income $ (852 ) $ (915 ) $ (67 ) $ (1,245 ) $ 444 $ (41 ) 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 2018 2017 2016 2018 2017 2016 2018 2017 2016 Service cost $ — $ — $ 354 $ 126 $ 132 $ 103 $ 45 $ 60 $ 76 Interest cost 43 1,538 1,659 280 298 358 293 363 396 Expected return on plan assets — (2,336 ) (2,400 ) (403 ) (379 ) (452 ) — — — Amortization of net actuarial loss 49 43 41 38 74 27 — — — Amortization of prior service cost — — 41 — — — — — — Foreign currency — — — 35 (1 ) 97 — — — Net periodic benefit cost (credit) 92 (755 ) (305 ) 76 124 133 338 423 472 Curtailment — — — (165 ) — — — — — Settlement 49 6,373 — — — — — — — Net benefit cost (credit) $ 141 $ 5,618 $ (305 ) $ (89 ) $ 124 $ 133 $ 338 $ 423 $ 472 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 2018 2017 2016 2018 2017 2016 2018 2017 2016 Prior service cost $ — $ — $ — $ 109 $ — $ — $ — $ — $ — Net actuarial loss (gain) 35 1,611 633 (1,249 ) (465 ) 1,718 (485 ) (524 ) 6 Amortization of prior service cost — — (41 ) (19 ) — — — — — Amortization of net actuarial loss (49 ) (43 ) (41 ) (38 ) (74 ) (27 ) — — — Settlement (49 ) (6,373 ) — — — — — — — Total recognized in other comprehensive (income) loss $ (63 ) $ (4,805 ) $ 551 $ (1,197 ) $ (539 ) $ 1,691 $ (485 ) $ (524 ) $ 6 Total recognized in net benefit cost (credit) and other comprehensive (income) loss $ 78 $ 813 $ 246 $ (1,286 ) $ (415 ) $ 1,824 $ (147 ) $ (101 ) $ 478 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 2019 $ 146 $ 243 $ 779 2020 138 249 830 2021 129 257 752 2022 121 265 755 2023 112 275 715 2024 to 2028 468 1,511 3,424 Total $ 1,114 $ 2,800 $ 7,255 The following amounts are included in Accumulated Other Comprehensive Loss as of December 31, 2018 and are expected to be recognized as components of net periodic benefit cost during 2019 : Pension Benefits Postretirement Medical Benefits Net actuarial loss $ 104 $ — Transition obligation 4 —

Shareholders' Equity

Shareholders' Equity	12 Months Ended
	Dec. 31, 2018
Stockholders' Equity Note [Abstract]
Shareholders' Equity	16. Shareholders' Equity Authorized Shares We are authorized to issue an aggregate of 60,000,000 shares, all of which are designated as Common Stock having a par value of $0.375 per share. The Board of Directors is authorized to establish one or more series of preferred stock, setting forth the designation of each such series, and fixing the relative rights and preferences of each such series. Accumulated Other Comprehensive Loss Components of Accumulated Other Comprehensive Loss, net of tax, within the Consolidated Balance Sheets and Consolidated Statements of Equity as of December 31 are as follows: 2018 2017 2016 Foreign currency translation adjustments $ (31,831 ) $ (15,778 ) $ (44,444 ) Pension and retiree medical benefits (332 ) (1,610 ) (5,391 ) Cash flow hedge (5,031 ) (4,935 ) (88 ) Total Accumulated Other Comprehensive Loss $ (37,194 ) $ (22,323 ) $ (49,923 ) The changes in components of Accumulated Other Comprehensive Loss, net of tax, are as follows: Foreign Currency Translation Adjustments Pension and Postretirement Benefits Cash Flow Hedge Total December 31, 2017 $ (15,778 ) $ (1,610 ) $ (4,935 ) $ (22,323 ) Other comprehensive (loss) income before reclassifications (16,053 ) 1,293 9,125 (5,635 ) Amounts reclassified from Accumulated Other Comprehensive Loss — 122 (8,095 ) (7,973 ) Adjustments to Accumulated Other Comprehensive Loss for disproportionate income tax effects recognized from the adoption of ASU 2018-02 — (137 ) (1,126 ) (1,263 ) Net current period other comprehensive (loss) income (16,053 ) 1,278 (96 ) (14,871 ) December 31, 2018 $ (31,831 ) $ (332 ) $ (5,031 ) $ (37,194 ) Accumulated Other Comprehensive Loss associated with pension and postretirement benefits and cash flow hedges are included in Notes 15 and 13, respectively.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	17. Commitments and Contingencies We lease office and warehouse facilities, vehicles and office equipment under operating lease agreements, which include both monthly and longer-term arrangements. Leases with initial terms of one year or more expire at various dates through 2028 and generally provide for extension options. Rent expense under the leasing agreements (exclusive of real estate taxes, insurance and other expenses payable under the leases) amounted to $23,348 , $21,566 and $18,640 in 2018 , 2017 and 2016 , respectively. The minimum rentals for aggregate lease commitments as of December 31, 2018 were as follows: 2019 $ 15,200 2020 8,973 2021 5,535 2022 3,592 2023 2,636 Thereafter 4,215 Total $ 40,151 Certain operating leases for vehicles contain residual value guarantee provisions, which would become due at the expiration of the operating lease agreement if the fair value of the leased vehicles is less than the guaranteed residual value. The aggregate residual value at lease expiration of those leases is $14,043 , of which we have guaranteed $8,404 . As of December 31, 2018 , we have recorded a liability for the estimated end-of-term loss related to this residual value guarantee of $243 for certain vehicles within our fleet. Our fleet also contains vehicles we estimate will settle at a gain. Gains on these vehicles will be recognized at the end of the lease term. In the ordinary course of business, we may become liable with respect to pending and threatened litigation, tax, environmental and other matters. While the ultimate results of current claims, investigations and lawsuits involving us are unknown at this time, we do not expect that these matters will have a material adverse effect on our consolidated financial position or results of operations. Legal costs associated with such matters are expensed as incurred. As of December 31, 2018, we hold a note receivable of $5,360 , including accrued interest, on our Consolidated Balance Sheet. There is some uncertainty about the collectability of this note receivable; however, we are not able to determine an appropriate allowance, if any, as of December 31, 2018.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income Taxes	18. Income Taxes On December 22, 2017, the Tax Act was signed into law. The Tax Act made broad and complex changes to the U.S. tax code which included a lowering of the U.S. federal corporate income tax rate from 35% to 21% effective January 1, 2018, accelerated expensing of qualified capital investments for a specific period, limitations of the deductibility of interest expense and executive compensation, and a transition from a worldwide to a territorial tax system, which required companies to pay a one-time transition tax on certain unrepatriated earnings from foreign subsidiaries. ASC 740, Income Taxes, requires a company to record the effects of a tax law change in the period of enactment. ASU 2018-05 allowed a company to record a provisional amount when it did not have the necessary information available, prepared or analyzed in reasonable detail to complete its accounting for the change in the tax law. The measurement period ends when the company has obtained, prepared and analyzed the information necessary to finalize its accounting, but could not extend beyond one year. In the fourth quarter of 2017, we included a provisional amount for the one-time transition tax on certain unrepatriated earnings. The accounting for the income tax effect of the one-time transition tax on certain unrepatriated earnings was finalized in the third quarter of 2018, impacting the year-to-date overall effective tax rate by (1.3)% . In the fourth quarter of 2017, we remeasured our deferred taxes at the reduced corporate tax rate of 21% and recognized the change as a discrete income tax expense. The accounting for the remeasurement of the deferred taxes and transition tax was finalized in the third quarter of 2018. Adjustments to the provisional amounts were not material to the consolidated financial statements. The accounting for the income tax effects of the Tax Act is complete as of December 31, 2018. Income from continuing operations for the three years ended December 31 was as follows: 2018 2017 2016 U.S. operations $ 23,913 $ 7,465 $ 54,018 Foreign operations 11,929 (8,757 ) 12,473 Total $ 35,842 $ (1,292 ) $ 66,491 Income tax expense (benefit) for the three years ended December 31 was as follows: 2018 2017 2016 Current: Federal $ 3,731 $ 2,590 $ 15,962 Foreign 7,030 8,701 3,035 State 1,033 812 1,859 $ 11,794 $ 12,103 $ 20,856 Deferred: Federal $ (3,135 ) $ 1,640 $ (472 ) Foreign (6,012 ) (8,699 ) (434 ) State (343 ) (131 ) (73 ) $ (9,490 ) $ (7,190 ) $ (979 ) Total: Federal $ 596 $ 4,230 $ 15,490 Foreign 1,018 2 2,601 State 690 681 1,786 Total Income Tax Expense $ 2,304 $ 4,913 $ 19,877 In general, it is our practice and intention to permanently reinvest the earnings of our foreign subsidiaries and repatriate earnings only when the tax impact is zero or immaterial and that position has not changed following incurring the transition tax under the Tax Act. Accordingly, no deferred taxes have been provided for withholding taxes or other taxes that would result upon repatriation of our approximately $1,572 of undistributed earnings from foreign subsidiaries to the United States as those earnings continue to be permanently reinvested. Our effective income tax rate varied from the U.S. federal statutory tax rate for the three years ended December 31 as follows: 2018 2017 2016 Tax at statutory rate 21.0 % 35.0 % 35.0 % (Decreases) increases in the tax rate from: State and local taxes, net of federal benefit 1.4 (21.1 ) 1.7 Effect of foreign operations (4.3 ) (70.8 ) (5.5 ) Transaction costs (4.2 ) (226.3 ) — Effect of 2017 deferred rate change (1.0 ) (154.3 ) — Transition Tax (1.0 ) (28.0 ) — Effect of changes in valuation allowances 6.6 (126.5 ) 1.9 Domestic production activities deduction 0.4 28.3 (2.2 ) Share-based payments (5.7 ) 90.4 — Research & Development credit (3.6 ) 82.9 (1.3 ) Other, net (3.2 ) 10.2 0.3 Effective income tax rate 6.4 % (380.2 )% 29.9 % Deferred tax assets and liabilities were comprised of the following as of December 31: 2018 2017 Deferred Tax Assets: Inventories, principally due to changes in inventory reserves $ 3,335 $ 4,757 Employee wages and benefits, principally due to accruals for financial reporting purposes 11,642 11,031 Warranty reserves accrued for financial reporting purposes 2,610 2,578 Receivables, principally due to allowance for doubtful accounts and tax accounting method for equipment rentals 1,728 2,138 Tax loss carryforwards 7,765 11,383 Tax credit carryforwards 4,708 1,575 Other 4,712 3,630 Gross Deferred Tax Assets $ 36,500 $ 37,092 Less: valuation allowance (11,519 ) (9,691 ) Total Net Deferred Tax Assets $ 24,981 $ 27,401 Deferred Tax Liabilities: Property, Plant and Equipment, principally due to differences in depreciation and related gains 9,882 9,042 Goodwill and Intangible Assets 45,628 60,450 Total Deferred Tax Liabilities $ 55,510 $ 69,492 Net Deferred Tax Liabilities $ (30,529 ) $ (42,091 ) Tax credit carryforwards consist of $1,812 foreign tax credits, $1,268 state tax credits, and $1,628 of Netherlands tax credits. We have non-U.S. cumulative tax losses of $35,593 in various countries. Cumulative losses can be used to offset the income tax liabilities on future income in these countries. $18,649 of these losses have unlimited carryforward periods. $16,944 of these losses have a limited carryforward period which must be utilized during 2019 to 2026. The valuation allowance at December 31, 2018 principally applies to the Netherlands tax loss and tax credit carryforwards, a Sweden tax loss carryforward, and state tax credit carryforwards that, in the opinion of management, are more likely than not to expire unutilized. However, to the extent that tax benefits related to these carryforwards are realized in the future, the reduction in the valuation allowance will reduce income tax expense. A valuation allowance for the remaining tax loss carryforwards is not required since it is more likely than not that they will be realized through carryback to taxable income in prior years, future reversals of existing taxable temporary differences and future taxable income. A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows: 2018 2017 Balance at January 1 $ 2,232 $ 2,477 Increases as a result of tax positions taken during a prior period 74 — Increases as a result of tax positions taken during the current year 370 329 Increase related to prior period tax positions of acquired entities 3,833 236 Decreases relating to settlement with tax authorities — (68 ) Reductions as a result of a lapse of the applicable statute of limitations (1,274 ) (770 ) Increases as a result of foreign currency fluctuations 418 28 Balance at December 31 $ 5,653 $ 2,232 Included in the balance of unrecognized tax benefits at December 31, 2018 and 2017 are potential benefits of $5,473 and $1,992 , respectively, that if recognized, would affect the effective tax rate from continuing operations. We recognize potential accrued interest and penalties related to unrecognized tax benefits as a component of income tax expense. In addition to the liability of $5,653 and $2,232 for unrecognized tax benefits as of December 31, 2018 and 2017 , there was approximately $416 and $482 , respectively, for accrued interest and penalties. To the extent interest and penalties are not assessed with respect to uncertain tax positions, the amounts accrued will be revised and reflected as an adjustment to income tax expense. We and our subsidiaries are subject to U.S. federal income tax as well as income tax of numerous state and foreign jurisdictions. We are generally no longer subject to U.S. federal tax examinations for taxable years before 2015 and, with limited exceptions, state and foreign income tax examinations for taxable years before 2014. The Internal Revenue Service completed its examination of the U.S. income tax return for the 2015 tax year during the third quarter of 2018. The IRS's adjustments to certain tax positions were not material. We are currently undergoing income tax examinations in various state and foreign jurisdictions covering 2014 to 2016 . Although the final outcome of these examinations cannot be currently determined, we believe that we have adequate reserves with respect to these examinations. We do not anticipate that total unrecognized tax benefits will change significantly within the next 12 months.

Share-Based Compensation

Share-Based Compensation	12 Months Ended
	Dec. 31, 2018
Share-based Compensation [Abstract]
Share-Based Compensation	19. Share-Based Compensation We have four plans under which we have awarded share-based compensation grants: The 1997 Non-Employee Directors Option Plan ("1997 Plan"), which provided for stock option grants to our non-employee Directors, the 2007 Stock Incentive Plan (“2007 Plan”), the Amended and Restated 2010 Stock Incentive Plan, as Amended (“2010 Plan”) and the 2017 Stock Incentive Plan ("2017 Plan"), which were adopted as a continuing step toward aggregating our equity compensation programs to reduce the complexity of our equity compensation programs. The 2010 Plan, originally approved by our shareholders on April 28, 2010 and amended and restated by our shareholders on April 25, 2012, terminated our rights to grant awards under the 2007 Plan; however, any awards granted under the 2007 or 2010 Plans that do not result in the issuance of shares of Common Stock may again be used for an award under the 2010 Plan. The 2010 Plan was amended and restated by our shareholders on April 24, 2013, increasing the number of shares available under the amended 2010 Plan from 1,500,000 shares to 2,600,000 shares. The 2017 Plan approved by our shareholders on April 26, 2017 terminated our rights to grant awards under previous plans; however, any awards granted under previous plans that do not result in the issuance of shares of Common Stock may again be used for an award under the 2017 Plan. There were 1,200,000 shares made available under the approved 2017 Plan. As of December 31, 2018 , there were 897,315 shares reserved for issuance under the 2007 Plan and the 2010 Plan for outstanding compensation awards. There were 761,382 shares available for issuance under the 2017 Plan for current and future equity awards as of December 31, 2018. The Compensation Committee of the Board of Directors determines the number of shares awarded and the grant date, subject to the terms of our equity award policy. We recognized total Share-Based Compensation Expense of $8,314 , $5,891 and $3,875 , respectively, during the years ended 2018 , 2017 and 2016 . The total excess tax benefit recognized for share-based compensation arrangements during the years ended 2018 , 2017 and 2016 was $2,060 , $1,168 and $686 , respectively. Stock Option Awards We determined the fair value of our stock option awards using the Black-Scholes valuation model that uses the assumptions noted in the table below. The expected term selected for stock options granted during the year represents the period of time that the stock options are expected to be outstanding based on historical data of stock option holder exercise and termination behavior of similar grants. The risk-free interest rate for periods within the contractual life of the stock option is based on the U.S. Treasury rate over the expected life at the time of grant. Expected volatilities are based upon historical volatility of our stock over a period equal to the expected life of each stock option grant. Dividend yield is estimated over the expected life based on our dividend policy and historical dividends paid. To determine the amount of compensation cost to be recognized in each period, we account for forfeitures as they occur. The following table illustrates the valuation assumptions used for the 2018 , 2017 and 2016 grants: 2018 2017 2016 Expected volatility 25% 25 - 26% 29 -32% Weighted-average expected volatility 25% 26% 32% Expected dividend yield 1.2% 1.2 - 1.3% 1.3 - 1.5% Weighted-average expected dividend yield 1.2% 1.3% 1.3% Expected term, in years 5 5 5 Risk-free interest rate 2.6 - 2.9% 1.7 - 2.0% 1.1 - 1.4% New stock option awards granted vest one-third each year over a three year period and have a ten year contractual term. Compensation expense equal to the grant date fair value is recognized for these awards on a straight-line basis over the awards' vesting period. Stock options granted to employees are subject to accelerated expensing if the option holder meets the retirement definition set forth in the 2017 and 2010 Plans. The following table summarizes the activity during the year ended December 31, 2018 for stock option awards: Shares Weighted-Average Exercise Price Outstanding at beginning of year 1,135,608 $ 47.47 Granted 202,623 67.85 Exercised (223,352 ) 26.33 Forfeited (30,312 ) 66.06 Outstanding at end of year 1,084,567 $ 55.11 Exercisable at end of year 711,499 $ 48.94 The weighted-average grant date fair value of stock options granted during the years ended December 31, 2018 , 2017 and 2016 was $16.07 , $16.39 and $13.61 , respectively. The total intrinsic value of stock options exercised during the years ended December 31, 2018 , 2017 and 2016 was $10,305 , $4,450 and $3,408 , respectively. The aggregate intrinsic value of options outstanding and exercisable at December 31, 2018 was $5,987 . The weighted-average remaining contractual life for options outstanding and exercisable as of December 31, 2018 was 5.9 years and 4.5 years , respectively. As of December 31, 2018 , there was unrecognized compensation cost for nonvested options of $1,944 , which is expected to be recognized over a weighted-average period of 1.3 years . Restricted Share Awards Restricted share awards for employees generally have a three year vesting period from the effective date of the grant. Restricted share awards to non-employee directors vest upon a change of control or upon termination of service as a director occurring at least six months after grant date of the award so long as termination is for one of the following reasons: death; disability; retirement in accordance with Tennant policy (e.g., age, term limits, etc.); resignation at request of Board (other than for gross misconduct); resignation following at least six months’ advance notice; failure to be renominated (unless due to unwillingness to serve) or reelected by shareholders; or removal by shareholders. We use the closing share price the day before the grant date to determine the fair value of our restricted share awards. Expenses on these awards are recognized over the vesting period. The following table summarizes the activity during the year ended December 31, 2018 for nonvested restricted share awards: Shares Weighted-Average Grant Date Fair Value Nonvested at beginning of year 99,789 $ 53.11 Granted 16,377 67.70 Vested (14,384 ) 68.00 Forfeited (1,561 ) 67.39 Nonvested at end of year 100,221 $ 53.52 The total fair value of restricted stock units vested during the years ended December 31, 2018 , 2017 and 2016 was $978 , $1,463 and $1,970 , respectively. As of December 31, 2018 , there was $1,196 of total unrecognized compensation cost related to nonvested restricted stock units which is expected to be recognized over a weighted-average period of 1.6 years . Performance Share Awards We grant performance share awards to key employees as a part of our long-term management compensation program. These awards are earned based upon achievement of certain financial performance targets over a three year period. The number of shares of common stock a participant receives will be increased (up to 200 percent of target levels) or reduced (down to zero ) based on the level of achievement of the financial performance targets. We use the closing share price the day before the grant date to determine the fair value of our performance share awards. Expenses on these awards are recognized over a three year performance period. Performance shares are granted in restricted stock units. They are payable in stock and vest solely upon achievement of certain financial performance targets during this three year period. The following table summarizes the activity during the year ended December 31, 2018 for nonvested performance share awards: Shares Weighted-Average Grant Date Fair Value Nonvested at beginning of year 123,024 $ 63.09 Granted 47,997 67.84 Forfeited (43,974 ) 66.23 Nonvested at end of year 127,047 $ 63.80 The total fair value of performance shares vested during the years ended December 31, 2017 and 2016 was $1,240 and $1,703 , respectively. No performance shares vested during the year ended December 31, 2018 . As of December 31, 2018 , we expect to recognize $3,287 of total compensation costs over a weighted-average period of 1.8 years . Restricted Stock Units We grant restricted stock units to employees and non-employee directors, which generally vest within three years from the date of the grant. Vested restricted stock units are paid out in stock. We use the closing share price the day before the grant date to determine the fair value of our restricted stock units. Expenses on these awards are recognized on a straight-line basis over the vesting period of the award. The following table summarizes the activity during the year ended December 31, 2018 for nonvested restricted stock units: Shares Weighted-Average Grant Date Fair Value Nonvested at beginning of year 43,125 $ 64.67 Granted 83,380 66.83 Vested (15,427 ) 58.27 Forfeited (9,123 ) 66.60 Nonvested at end of year 101,955 $ 67.23 The total fair value of shares vested during the years ended December 31, 2018 and 2017 was $899 and $962 , respectively. As of December 31, 2018 , there was $4,473 of total unrecognized compensation cost related to nonvested shares which is expected to be recognized over a weighted-average period of 2.0 years . Share-Based Liabilities As of December 31, 2018 and 2017 , we had $213 and $175 in total share-based liabilities recorded on our Consolidated Balance Sheets, respectively. During the years ended December 31, 2018 , 2017 and 2016 , we paid out $32 , $45 and $62 related to share-based liability awards, respectively.

Earnings Per Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2018
Earnings Per Share [Abstract]
Earnings Per Share	20. Earnings (Loss) Attributable to Tennant Company Per Share The computations of Basic and Diluted Earnings (Loss) Attributable to Tennant Company per Share for the years ended December 31 were as follows: 2018 2017 2016 Numerator: Net Earnings (Loss) Attributable to Tennant Company $ 33,412 $ (6,195 ) $ 46,614 Denominator: Basic - Weighted Average Shares Outstanding 17,940,438 17,695,390 17,523,267 Effect of dilutive securities 398,131 — 452,916 Diluted - Weighted Average Shares Outstanding 18,338,569 17,695,390 17,976,183 Basic Earnings (Loss) per Share $ 1.86 $ (0.35 ) $ 2.66 Diluted Earnings (Loss) per Share $ 1.82 $ (0.35 ) $ 2.59 Excluded from the dilutive securities shown above were options to purchase and shares to be paid out under share-based compensation plans of 293,356 , 711,212 and 356,598 shares of common stock during 2018 , 2017 and 2016 , respectively. These exclusions were made if the exercise prices of these options are greater than the average market price of our common stock for the period, if the number of shares we can repurchase under the treasury stock method exceeds the weighted shares outstanding in the options or if we have a net loss, as the effects are anti-dilutive.

Segment Reporting

Segment Reporting	12 Months Ended
	Dec. 31, 2018
Segment Reporting [Abstract]
Segment Reporting	21. Segment Reporting We are organized into four operating segments: North America; Latin America; Europe, Middle East, Africa; and Asia Pacific. We combine our North America and Latin America operating segments into the "Americas" for reporting net sales by geographic area. In accordance with the objective and basic principles of the applicable accounting guidance, we aggregate our operating segments into one reportable segment that consists of the design, manufacture and sale of products used primarily in the maintenance of nonresidential surfaces. The following table presents Net Sales by geographic area for the years ended December 31: 2018 2017 2016 Net Sales: Americas $ 690,996 $ 640,274 $ 607,026 Europe, Middle East, Africa 335,603 273,738 129,046 Asia Pacific 96,912 89,054 72,500 Total $ 1,123,511 $ 1,003,066 $ 808,572 The following table presents long-lived assets by geographic area as of December 31: 2018 2017 2016 Long-lived assets: Americas $ 118,609 $ 132,659 $ 134,737 Europe, Middle East, Africa 385,659 422,338 19,606 Asia Pacific 4,145 4,731 4,334 Total $ 508,413 $ 559,728 $ 158,677 Accounting policies of the operations in the various operating segments are the same as those described in Note 1. Net Sales are attributed to each operating segment based on the end user country and are net of intercompany sales. No single customer represents more than 10% of our consolidated Net Sales. Long-lived assets consist of Property, Plant and Equipment, Goodwill, Intangible Assets and certain other assets. Long-lived assets located in Italy totaled $355,460 and $393,917 , respectively, at December 31, 2018 and 2017, as a result of our acquisition of IPC Group. We did not have long-lived assets located in Italy for 2016. There are no other individual foreign locations which have long-lived assets which represent more than 10% of our consolidated long-lived assets. The following table presents revenues for groups of similar products and services for the years ended December 31: 2018 2017 2016 Net Sales: Equipment $ 729,993 $ 636,875 $ 491,075 Parts and consumables 222,345 202,452 173,632 Service and other 141,346 132,332 114,719 Specialty surface coatings 29,827 31,407 29,146 Total $ 1,123,511 $ 1,003,066 $ 808,572

Consolidated Quarterly Data

Consolidated Quarterly Data	12 Months Ended
	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Consolidated Quarterly Data (Unaudited)	22. Consolidated Quarterly Data (Unaudited) 2018 Q1 Q2 Q3 Q4 Net Sales $ 272,847 $ 292,197 $ 273,255 $ 285,212 Gross Profit 109,116 (a) 117,225 (a) 106,509 (a) 112,172 Net Earnings Attributable to Tennant Company 3,274 12,744 9,676 7,717 Basic Earnings Attributable to Tennant Company per Share $ 0.18 $ 0.71 $ 0.54 $ 0.43 Diluted Earnings Attributable to Tennant Company per Share $ 0.18 $ 0.69 $ 0.52 $ 0.42 (a) Amounts have been revised for misclassifications between Cost of Sales and Selling and Administrative Expense. See Note 3 for further information. Gross Profit was reduced by $1,521, $1,574, and $1,576 for Q1 2018, Q2 2018 and Q3 2018, respectively, and Selling and Administrative Expense was decreased by the same amounts during those periods. 2017 Q1 Q2 Q3 Q4 Net Sales $ 191,059 $ 270,791 $ 261,921 $ 279,295 Gross Profit 79,736 103,130 (a) 103,081 (a) 113,866 (a) Net (Loss) Earnings Attributable to Tennant Company (3,957 ) (2,591 ) 3,559 (3,206 ) Basic (Loss) Earnings Attributable to Tennant Company per Share $ (0.22 ) $ (0.15 ) $ 0.20 $ (0.18 ) Diluted (Loss) Earnings Attributable to Tennant Company per Share $ (0.22 ) $ (0.15 ) $ 0.20 $ (0.18 ) (a) Amounts have been revised for misclassifications between Cost of Sales and Selling and Administrative Expense. See Note 3 for further information. Gross Profit was reduced by $1,424, $1,523, and $1,661 for Q2 2017, Q3 2017 and Q4 2017, respectively, and Selling and Administrative Expense was decreased by the same amounts during those periods. The summation of quarterly data may not equate to the calculation for the full fiscal year as quarterly calculations are performed on a discrete basis. Regular quarterly dividends aggregated to $0.85 per share in 2018 , or $0.21 per share for the first three quarters and $0.22 per share for the last quarter of 2018, and $0.84 per share in 2017 , or $0.21 per share per quarter.

Separate Financial Information

Separate Financial Information of Guarantor Subsidiaries (Notes)	12 Months Ended
	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Condensed Financial Statements	23. Separate Financial Information of Guarantor Subsidiaries The following condensed consolidated guarantor financial information is presented to comply with the requirements of Rule 3-10 of Regulation S-X. On April 18, 2017 , we issued and sold $300,000 in aggregate principal amount of our 5.625% Senior Notes due 2025 (the “Notes”), pursuant to an Indenture, dated as of April 18, 2017, among the company, the Guarantors (as defined below), and Wells Fargo Bank, National Association, a national banking association, as trustee. The Notes are unconditionally and jointly and severally guaranteed by Tennant Coatings, Inc. and Tennant Sales and Service Company (collectively, the “Guarantors” or "Guarantor Subsidiaries"), which are wholly-owned subsidiaries of the company. The Notes and the guarantees constitute senior unsecured obligations of the company and the Guarantors, respectively. The Notes and the guarantees, respectively, are: (a) equal in right of payment with all of the company’s and the Guarantors’ senior debt, without giving effect to collateral arrangements; (b) senior in right of payment to all of the company’s and the Guarantors’ future subordinated debt, if any; (c) effectively subordinated in right of payment to all of the company’s and the Guarantors’ debt and obligations that are secured, including borrowings under the company’s senior secured credit facilities for so long as the senior secured credit facilities are secured, to the extent of the value of the assets securing such liens; and (d) structurally subordinated in right of payment to all liabilities (including trade payables) of the company’s and the Guarantors’ subsidiaries that do not guarantee the Notes. The following condensed consolidated financial information presents the Condensed Consolidated Statements of Earnings, Comprehensive Income and Cash Flows for each of the years in the three year period ended December 31, 2018 , and the related Condensed Consolidated Balance Sheets as of December 31, 2018 and 2017 , of Tennant Company ("Parent"), the Guarantor Subsidiaries on a combined basis, the Non-Guarantor Subsidiaries on a combined basis and elimination entries necessary to consolidate the Parent with the Guarantor and Non-Guarantor Subsidiaries. The following condensed consolidated financial statements should be read in conjunction with the consolidated financial statements of the company and notes thereto of which this note is an integral part. Condensed Consolidated Statement of Earnings For the year ended December 31, 2018 (in thousands) Parent Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Total Tennant Company Net Sales $ 494,341 $ 634,341 $ 570,627 $ (575,798 ) $ 1,123,511 Cost of Sales 336,398 533,800 383,010 (574,730 ) 678,478 Gross Profit 157,943 100,541 187,617 (1,068 ) 445,033 Operating Expense: Research and Development Expense 24,455 1,090 5,194 — 30,739 Selling and Administrative Expense 116,528 76,623 161,911 1,254 356,316 Total Operating Expense 140,983 77,713 167,105 1,254 387,055 Profit (Loss) from Operations 16,960 22,828 20,512 (2,322 ) 57,978 Other Income (Expense): Equity in Earnings of Affiliates 27,409 2,249 5,374 (35,032 ) — Interest (Expense) Income, Net (20,466 ) — 196 (37 ) (20,307 ) Intercompany Interest Income (Expense) 14,597 (5,760 ) (8,837 ) — — Net Foreign Currency Transaction Losses (370 ) (21 ) (709 ) — (1,100 ) Other (Expense) Income, Net (2,288 ) (2,434 ) 2,862 1,131 (729 ) Total Other Income (Expense), Net 18,882 (5,966 ) (1,114 ) (33,938 ) (22,136 ) Profit (Loss) Before Income Taxes 35,842 16,862 19,398 (36,260 ) 35,842 Income Tax Expense (Benefit) 2,304 4,022 388 (4,410 ) 2,304 Net Earnings (Loss) Including Noncontrolling Interest 33,538 12,840 19,010 (31,850 ) 33,538 Net Earnings Attributable to Noncontrolling Interest 126 — 126 (126 ) 126 Net Earnings (Loss) Attributable to Tennant Company $ 33,412 $ 12,840 $ 18,884 $ (31,724 ) $ 33,412 Condensed Consolidated Statement of Earnings For the year ended December 31, 2017 (in thousands) Parent Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Total Tennant Company Net Sales $ 454,703 $ 594,405 $ 471,559 $ (517,601 ) $ 1,003,066 Cost of Sales 311,897 488,972 321,759 (519,375 ) 603,253 Gross Profit 142,806 105,433 149,800 1,774 399,813 Operating Expense: Research and Development Expense 27,219 315 4,479 — 32,013 Selling and Administrative Expense 110,414 78,516 145,852 — 334,782 Total Operating Expense 137,633 78,831 150,331 — 366,795 Profit (Loss) from Operations 5,173 26,602 (531 ) 1,774 33,018 Other Income (Expense): Equity in Earnings of Affiliates 12,754 2,004 28,855 (43,613 ) — Interest Expense, Net (22,659 ) — (299 ) (31 ) (22,989 ) Intercompany Interest Income (Expense) 12,519 (5,776 ) (6,743 ) — — Net Foreign Currency Transaction Gains (Losses) 857 — (4,244 ) — (3,387 ) Other (Expense) Income, Net (9,936 ) (736 ) 2,841 (103 ) (7,934 ) Total Other (Expense) Income, Net (6,465 ) (4,508 ) 20,410 (43,747 ) (34,310 ) (Loss) Profit Before Income Taxes (1,292 ) 22,094 19,879 (41,973 ) (1,292 ) Income Tax Expense (Benefit) 4,913 8,070 (98 ) (7,972 ) 4,913 Net (Loss) Earnings Including Noncontrolling Interest $ (6,205 ) $ 14,024 $ 19,977 $ (34,001 ) $ (6,205 ) Net Loss Attributable to Noncontrolling Interest $ (10 ) $ — $ (10 ) $ 10 $ (10 ) Net (Loss) Earnings Attributable to Tennant Company $ (6,195 ) $ 14,024 $ 19,987 $ (34,011 ) $ (6,195 ) Condensed Consolidated Statement of Earnings For the year ended December 31, 2016 (in thousands) Parent Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Total Tennant Company Net Sales $ 455,375 $ 587,815 $ 290,349 $ (524,967 ) $ 808,572 Cost of Sales 299,459 483,075 199,336 (524,893 ) 456,977 Gross Profit 155,916 104,740 91,013 (74 ) 351,595 Operating Expense: Research and Development Expense 32,378 429 1,931 — 34,738 Selling and Administrative Expense 95,340 74,643 78,609 — 248,592 Total Operating Expense 127,718 75,072 80,540 — 283,330 Profit from Operations 28,198 29,668 10,473 (74 ) 68,265 Other Income (Expense): Equity in Earnings of Affiliates 34,068 2,192 — (36,260 ) — Interest (Expense) Income, Net (1,204 ) — 255 — (949 ) Intercompany Interest Income (Expense) 7,157 (5,570 ) (1,587 ) — — Net Foreign Currency Transaction Gains (Losses) 648 (652 ) (388 ) — (392 ) Other (Expense) Income, Net (2,376 ) (573 ) 2,516 — (433 ) Total Other Income (Expense), Net 38,293 (4,603 ) 796 (36,260 ) (1,774 ) Profit Before Income Taxes 66,491 25,065 11,269 (36,334 ) 66,491 Income Tax Expense 19,877 9,443 2,427 (11,870 ) 19,877 Net Earnings (Loss) Attributable to Tennant Company $ 46,614 $ 15,622 $ 8,842 $ (24,464 ) $ 46,614 Condensed Consolidated Statement of Comprehensive Income For the year ended December 31, 2018 (in thousands) Parent Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Total Tennant Company Net Earnings (Loss) Including Noncontrolling Interest $ 33,538 $ 12,840 $ 19,010 $ (31,850 ) $ 33,538 Other Comprehensive Income (Loss): Foreign currency translation adjustments (16,221 ) (961 ) (21,422 ) 22,383 (16,221 ) Pension and retiree medical benefits 1,745 — 1,197 (1,197 ) 1,745 Cash flow hedge 1,341 — — — 1,341 Income Taxes: Foreign currency translation adjustments 168 — 168 (168 ) 168 Pension and retiree medical benefits (467 ) — (205 ) 205 (467 ) Cash flow hedge (1,437 ) — — — (1,437 ) Total Other Comprehensive (Loss) Income, net of tax (14,871 ) (961 ) (20,262 ) 21,223 (14,871 ) Total Comprehensive Income (Loss) Including Noncontrolling Interest 18,667 11,879 (1,252 ) (10,627 ) 18,667 Comprehensive Income Attributable to Noncontrolling Interest 126 — 126 (126 ) 126 Comprehensive Income (Loss) Attributable to Tennant Company $ 18,541 $ 11,879 $ (1,378 ) $ (10,501 ) $ 18,541 Condensed Consolidated Statement of Comprehensive Income For the year ended December 31, 2017 (in thousands) Parent Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Total Tennant Company Net (Loss) Earnings $ (6,205 ) $ 14,024 $ 19,977 $ (34,001 ) $ (6,205 ) Other Comprehensive Income (Loss): Foreign currency translation adjustments 28,356 1,215 2,960 (4,175 ) 28,356 Pension and retiree medical benefits 5,868 — 538 (538 ) 5,868 Cash flow hedge (7,731 ) — — — (7,731 ) Income Taxes: Foreign currency translation adjustments 310 — 310 (310 ) 310 Pension and retiree medical benefits (2,087 ) — (99 ) 99 (2,087 ) Cash flow hedge 2,884 — — — 2,884 Total Other Comprehensive Income (Loss), net of tax 27,600 1,215 3,709 (4,924 ) 27,600 Total Comprehensive Income Including Noncontrolling Interest 21,395 15,239 23,686 (38,925 ) 21,395 Comprehensive Loss Attributable to Noncontrolling Interest (10 ) — (10 ) 10 (10 ) Comprehensive Income $ 21,405 $ 15,239 $ 23,696 $ (38,935 ) $ 21,405 Condensed Consolidated Statement of Comprehensive Income For the year ended December 31, 2016 (in thousands) Parent Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Total Tennant Company Net Earnings $ 46,614 $ 15,622 $ 8,842 $ (24,464 ) $ 46,614 Other Comprehensive (Loss) Income: Foreign currency translation adjustments 109 270 3,534 (3,804 ) 109 Pension and retiree medical benefits (2,248 ) — (1,691 ) 1,691 (2,248 ) Cash flow hedge (305 ) — — — (305 ) Income Taxes: Foreign currency translation adjustments 32 — 32 (32 ) 32 Pension and retiree medical benefits 504 — 296 (296 ) 504 Cash flow hedge 114 — — — 114 Total Other Comprehensive (Loss) Earnings, net of tax (1,794 ) 270 2,171 (2,441 ) (1,794 ) Comprehensive Income (Loss) $ 44,820 $ 15,892 $ 11,013 $ (26,905 ) $ 44,820 Condensed Consolidated Balance Sheet As of December 31, 2018 (in thousands) Parent Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Total Tennant Company ASSETS Current Assets: Cash and Cash Equivalents $ 24,779 $ 1,610 $ 59,220 $ — $ 85,609 Restricted Cash — — 525 — 525 Net Receivables 866 94,763 120,541 — 216,170 Intercompany Receivables 29,976 148,961 — (178,937 ) — Inventories 37,154 13,381 94,680 (10,082 ) 135,133 Prepaid Expenses 12,565 782 9,282 (488 ) 22,141 Other Current Assets 4,935 396 3,735 — 9,066 Total Current Assets 110,275 259,893 287,983 (189,507 ) 468,644 Property, Plant and Equipment 229,826 12,677 144,138 — 386,641 Accumulated Depreciation (159,344 ) (6,913 ) (56,937 ) — (223,194 ) Property, Plant and Equipment, Net 70,482 5,764 87,201 — 163,447 Deferred Income Taxes 4,035 3,072 8,382 — 15,489 Investment in Affiliates 420,897 12,142 20,768 (453,807 ) — Intercompany Loans 301,555 — 3,205 (304,760 ) — Goodwill 12,870 1,726 168,075 — 182,671 Intangible Assets, Net 4,012 2,684 139,850 — 146,546 Other Assets 6,987 (2 ) 8,762 — 15,747 Total Assets $ 931,113 $ 285,279 $ 724,226 $ (948,074 ) $ 992,544 LIABILITIES AND TOTAL EQUITY Current Liabilities: Current Portion of Long-Term Debt $ 21,816 $ — $ 5,189 $ — $ 27,005 Accounts Payable 40,991 4,982 52,425 — 98,398 Intercompany Payables 149,460 — 29,477 (178,937 ) — Employee Compensation and Benefits 13,947 16,890 18,616 — 49,453 Income Taxes Payable 806 — 1,984 (667 ) 2,123 Other Current Liabilities 22,387 17,939 31,390 179 71,895 Total Current Liabilities 249,407 39,811 139,081 (179,425 ) 248,874 Long-Term Liabilities: Long-Term Debt 326,460 — 1,600 — 328,060 Intercompany Loans 3,205 128,000 173,555 (304,760 ) — Employee-Related Benefits 11,041 2,015 8,054 — 21,110 Deferred Income Taxes — — 46,018 — 46,018 Other Liabilities 24,648 2,899 4,583 — 32,130 Total Long-Term Liabilities 365,354 132,914 233,810 (304,760 ) 427,318 Total Liabilities 614,761 172,725 372,891 (484,185 ) 676,192 Equity: Common Stock 6,797 — 11,131 (11,131 ) 6,797 Additional Paid-In Capital 28,550 77,551 399,459 (477,010 ) 28,550 Retained Earnings 316,269 36,633 (2,532 ) (34,101 ) 316,269 Accumulated Other Comprehensive Loss (37,194 ) (1,630 ) (58,653 ) 60,283 (37,194 ) Total Tennant Company Shareholders’ Equity 314,422 112,554 349,405 (461,959 ) 314,422 Noncontrolling Interest 1,930 — 1,930 (1,930 ) 1,930 Total Equity 316,352 112,554 351,335 (463,889 ) 316,352 Total Liabilities and Total Equity $ 931,113 $ 285,279 $ 724,226 $ (948,074 ) $ 992,544 Condensed Consolidated Balance Sheet As of December 31, 2017 (in thousands) Parent Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Total Tennant Company ASSETS Current Assets: Cash and Cash Equivalents $ 18,469 $ 507 $ 39,422 $ — $ 58,398 Restricted Cash — — 653 — 653 Net Receivables 683 88,629 120,204 — 209,516 Intercompany Receivables 53,444 133,778 — (187,222 ) — Inventories 29,450 12,695 94,542 (8,993 ) 127,694 Prepaid Expenses 8,774 1,172 9,405 — 19,351 Other Current Assets 4,030 — 3,473 — 7,503 Total Current Assets 114,850 236,781 267,699 (196,215 ) 423,115 Property, Plant and Equipment 225,064 12,155 145,549 — 382,768 Accumulated Depreciation (146,320 ) (6,333 ) (50,097 ) — (202,750 ) Property, Plant and Equipment, Net 78,744 5,822 95,452 — 180,018 Deferred Income Taxes 1,308 2,669 7,157 — 11,134 Investment in Affiliates 392,486 11,273 20,811 (424,570 ) — Intercompany Loans 304,822 — 4,983 (309,805 ) — Goodwill 12,869 1,739 171,436 — 186,044 Intangible Assets, Net 2,105 2,898 167,344 — 172,347 Other Assets 10,363 — 10,956 — 21,319 Total Assets $ 917,547 $ 261,182 $ 745,838 $ (930,590 ) $ 993,977 LIABILITIES AND SHAREHOLDERS' EQUITY Current Liabilities: Current Portion of Long-Term Debt $ 29,413 $ — $ 1,470 $ — $ 30,883 Accounts Payable 39,927 3,018 53,137 — 96,082 Intercompany Payables 133,778 1,963 51,481 (187,222 ) — Employee Compensation and Benefits 8,311 10,355 18,591 — 37,257 Income Taxes Payable 366 — 2,472 — 2,838 Other Current Liabilities 20,183 15,760 33,504 — 69,447 Total Current Liabilities 231,978 31,096 160,655 (187,222 ) 236,507 Long-Term Liabilities: Long-Term Debt 344,147 — 1,809 — 345,956 Intercompany Loans — 128,000 181,805 (309,805 ) — Employee-Related Benefits 11,160 3,992 8,715 — 23,867 Deferred Income Taxes — — 53,225 — 53,225 Other Liabilities 31,788 2,483 1,677 — 35,948 Total Long-Term Liabilities 387,095 134,475 247,231 (309,805 ) 458,996 Total Liabilities 619,073 165,571 407,886 (497,027 ) 695,503 Shareholders' Equity: Common Stock 6,705 — 11,131 (11,131 ) 6,705 Additional Paid-In Capital 15,089 72,483 384,460 (456,943 ) 15,089 Retained Earnings 297,032 23,797 (21,219 ) (2,578 ) 297,032 Accumulated Other Comprehensive Loss (22,323 ) (669 ) (38,391 ) 39,060 (22,323 ) Total Tennant Company Shareholders’ Equity 296,503 95,611 335,981 (431,592 ) 296,503 Noncontrolling Interest 1,971 — 1,971 (1,971 ) 1,971 Total Equity 298,474 95,611 337,952 (433,563 ) 298,474 Total Liabilities and Total Equity $ 917,547 $ 261,182 $ 745,838 $ (930,590 ) $ 993,977 Condensed Consolidated Statement of Cash Flows For the year ended December 31, 2018 (in thousands) Parent Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Total Tennant Company OPERATING ACTIVITIES Net Cash Provided by Operating Activities $ 68,082 $ 1,202 $ 10,888 $ (202 ) $ 79,970 INVESTING ACTIVITIES Purchases of Property, Plant and Equipment (6,832 ) (99 ) (11,849 ) — (18,780 ) Proceeds from Disposals of Property, Plant and Equipment 21 — 91 — 112 Proceeds from Principal Payments Received on Long-Term Note Receivable — — 1,416 — 1,416 Proceeds from Sale of Business — — 4,000 — 4,000 Purchases of Intangible Asset (2,500 ) — (275 ) — (2,775 ) Change in Investments in Subsidiaries (15,622 ) — — 15,622 — Loan Payments Received by Parent from Subsidiary 1,218 — — (1,218 ) — Loan Payments Received by Subsidiary from Parent — — 1,778 (1,778 ) — Net Cash Used in Investing Activities (23,715 ) (99 ) (4,839 ) 12,626 (16,027 ) FINANCING ACTIVITIES Proceeds from Short-Term Debt — — 3,926 — 3,926 Loan Repayments made to Parent from Subsidiary — — (1,218 ) 1,218 — Loan Repayments made to Subsidiary from Parent (1,778 ) — — 1,778 — Change in Subsidiary Equity — — 15,622 (15,622 ) — Proceeds from Issuance of Long-Term Debt 11,000 — — — 11,000 Payments of Long-Term Debt (38,000 ) — (255 ) — (38,255 ) Change in Capital Lease Obligations — — 14 — 14 Proceeds from Issuances of Common Stock 5,880 — — — 5,880 Dividends Paid (15,343 ) — (202 ) 202 (15,343 ) Net Cash (Used in) Provided by Financing Activities (38,241 ) — 17,887 (12,424 ) (32,778 ) Effect of Exchange Rate Changes on Cash, Cash Equivalents and Restricted Cash 184 — (4,266 ) — (4,082 ) NET INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH 6,310 1,103 19,670 — 27,083 Cash, Cash Equivalents and Restricted Cash at Beginning of Year 18,469 507 40,075 — 59,051 CASH, CASH EQUIVALENTS AND RESTRICTED CASH AT END OF YEAR $ 24,779 $ 1,610 $ 59,745 $ — $ 86,134 Condensed Consolidated Statement of Cash Flows For the year ended December 31, 2017 (in thousands) Parent Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Total Tennant Company OPERATING ACTIVITIES Net Cash Provided by Operating Activities $ 26,992 $ 280 $ 27,711 $ (809 ) $ 54,174 INVESTING ACTIVITIES Purchases of Property, Plant and Equipment (9,558 ) — (10,879 ) — (20,437 ) Proceeds from Disposals of Property, Plant and Equipment 23 1 2,487 — 2,511 Proceeds from Principal Payments received on Long-Term Note Receivable — — 667 — 667 Acquisition of Businesses, Net of Cash Acquired (304 ) — (353,769 ) — (354,073 ) Issuance of Long-Term Note Receivable — — (1,500 ) — (1,500 ) Purchase of Intangible Asset (2,500 ) — — — (2,500 ) Change in Investments in Subsidiaries (199,028 ) — — 199,028 — Loan Borrowings (Payments) from Subsidiaries (159,780 ) — (4,983 ) 164,763 — Net Cash (Used in) Provided by Investing Activities (371,147 ) 1 (367,977 ) 363,791 (375,332 ) FINANCING ACTIVITIES Proceeds from Short-Term Debt 303,000 — — — 303,000 Repayments of Short-Term Debt (303,000 ) — — — (303,000 ) Loan Borrowings (Payments) from Parent 4,983 — 159,780 (164,763 ) — Change in Subsidiary Equity — — 199,028 (199,028 ) — Payments of Long-Term Debt (96,142 ) — (106 ) — (96,248 ) Proceeds from Issuance of Long-Term Debt 440,000 — — — 440,000 Payments of Debt Issuance Costs (16,482 ) — — — (16,482 ) Change in Capital Lease Obligations — — 311 — 311 Proceeds from Issuances of Common Stock 6,875 — — — 6,875 Purchase of Noncontrolling Owner Interest — — (30 ) — (30 ) Dividends Paid (14,953 ) — (809 ) 809 (14,953 ) Net Cash Provided by Financing Activities 324,281 — 358,174 (362,982 ) 319,473 Effect of Exchange Rate Changes on Cash and Cash Equivalents (141 ) — 2,327 — 2,186 NET (DECREASE) INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH (20,015 ) 281 20,235 — 501 Cash, Cash Equivalents and Restricted Cash at Beginning of Year 38,484 226 19,840 — 58,550 CASH, CASH EQUIVALENTS AND RESTRICTED CASH AT END OF YEAR $ 18,469 $ 507 $ 40,075 $ — $ 59,051 Condensed Consolidated Statement of Cash Flows For the year ended December 31, 2016 (in thousands) Parent Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Total Tennant Company OPERATING ACTIVITIES Net Cash Provided by Operating Activities $ 44,147 $ 239 $ 14,090 $ (598 ) $ 57,878 INVESTING ACTIVITIES Purchases of Property, Plant and Equipment (21,507 ) (13 ) (5,006 ) — (26,526 ) Proceeds from Disposals of Property, Plant and Equipment 377 — 238 — 615 Acquisition of Businesses, Net of Cash Acquired — (11,539 ) (1,394 ) — (12,933 ) Issuance of Long-Term Note Receivable — — (2,000 ) — (2,000 ) Loan Borrowings (Payments) from Subsidiaries 8,690 — — (8,690 ) — Proceeds from Sale of Business — — 285 — 285 Change in Investments in Subsidiaries (19,594 ) — — 19,594 — Net Cash Used in Investing Activities (32,034 ) (11,552 ) (7,877 ) 10,904 (40,559 ) FINANCING ACTIVITIES Loan (Payments) Borrowings from Parent — 7,969 (16,659 ) 8,690 — Change in Subsidiary Entity — 3,570 16,024 (19,594 ) — Payments of Long-Term Debt (3,429 ) — (31 ) — (3,460 ) Proceeds from Issuance of Long-Term Debt 15,000 — — — 15,000 Purchases of Common Stock (12,762 ) — — — (12,762 ) Proceeds from Issuances of Common Stock 5,271 — — — 5,271 Excess Tax Benefit on Stock Plans 686 — — — 686 Dividends Paid (14,293 ) — (598 ) 598 (14,293 ) Net Cash (Used in) Provided by Financing Activities (9,527 ) 11,539 (1,264 ) (10,306 ) (9,558 ) Effect of Exchange Rate Changes on Cash and Cash Equivalents 63 — (1,213 ) — (1,150 ) NET INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH 2,649 226 3,736 — 6,611 Cash, Cash Equivalents and Restricted Cash at Beginning of Year 35,835 — 16,104 — 51,939 CASH, CASH EQUIVALENTS AND RESTRICTED CASH AT END OF YEAR $ 38,484 $ 226 $ 19,840 $ — $ 58,550

Subsequent Events (Notes)

Subsequent Events (Notes)	12 Months Ended
	Dec. 31, 2018
Subsequent Events [Abstract]
Mergers, Acquisitions and Dispositions Disclosures [Text Block]	24. Subsequent Event On September 4, 2018, we signed a definitive agreement to acquire 100% of the outstanding capital stock of Hefei Gaomei Cleaning Machines Co., Ltd. and 99% of the outstanding capital stock of Anhui Rongen Environmental Protection Technology Co., Ltd. (collectively "Gaomei"), privately held designers and manufacturers of commercial cleaning solutions based in China. The acquisition closed on January 4, 2019. The purchase price includes cash and contingent consideration which will be paid out over the next few years. The purchase price and net assets acquired are not significant to our consolidated financial statements.

Schedule II Valuation and Quali

Schedule II Valuation and Qualifying Accounts	12 Months Ended
	Dec. 31, 2017
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]
Schedule II - Valuation and Qualifying Accounts	Schedule II - Valuation and Qualifying Accounts (In thousands) 2018 2017 2016 Allowance for Doubtful Accounts: Balance at beginning of year $ 2,428 $ 2,570 $ 2,929 Charged to costs and expenses 375 1,183 649 Reclassification (1) 772 (526 ) — Charged to other accounts (2) (222 ) 80 (4 ) Deductions (3) (837 ) (879 ) (1,004 ) Balance at end of year $ 2,516 $ 2,428 $ 2,570 Sales Returns Reserve: Balance at beginning of year $ 813 $ 538 (5) $ 686 (5) Charged to costs and expenses 688 419 (5) (88 ) (5) Charged to other accounts (2) 10 31 (5) (15 ) (5) Deductions (3) (198 ) (175 ) (5) (45 ) (5) Balance at end of year $ 1,313 $ 813 (5) $ 538 (5) Inventory Reserves: Balance at beginning of year $ 4,107 $ 3,644 $ 3,540 Charged to costs and expenses 1,916 1,698 1,455 Charged to other accounts (2) (139 ) 183 (50 ) Deductions (4) (246 ) (1,418 ) (1,301 ) Balance at end of year $ 5,638 $ 4,107 $ 3,644 Valuation Allowance for Deferred Tax Assets: Balance at beginning of year $ 9,691 $ 6,865 $ 5,884 Charged to costs and expenses 2,373 1,634 1,295 Charged to other accounts (2) (545 ) 1,192 (314 ) Balance at end of year $ 11,519 $ 9,691 $ 6,865 (1) Includes amount reclassified between Allowance for Doubtful Accounts and Other Receivables related to a customer's open receivables balance which was resolved in 2018, as well as acquisition-related adjustments. (2) Primarily includes impact from foreign currency fluctuations. (3) Includes accounts determined to be uncollectible and charged against reserves, net of collections on accounts previously charged against reserves. (4) Includes inventory identified as excess, slow moving or obsolete and charged against reserves. (5) These balances were included in the Allowance for Doubtful Accounts in 2017 and 2016. Due to the adoption of ASC 606, the Sales Returns Reserve is now included in Other Current Liabilities. Please see Note 2 for further discussion. All other schedules are omitted because they are not applicable or the required information is shown in the Consolidated Financial Statements or notes thereto.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2018
Summary of Significant Accounting Policies [Abstract]
Nature of Operations	Nature of Operations – Tennant Company is a world leader in designing, manufacturing and marketing solutions that empower customers to achieve quality cleaning performance, significantly reduce environmental impact and help create a cleaner, safer, healthier world. Tennant offers products and solutions consisting of mechanized cleaning equipment, detergent-free and other sustainable cleaning technologies, aftermarket parts and consumables, equipment maintenance and repair service, specialty surface coatings, and business solutions such as financing, rental and leasing programs, and machine-to-machine asset management solutions. Tennant products are used in many types of environments including: Retail establishments, distribution centers, factories and warehouses, public venues such as arenas and stadiums, office buildings, schools and universities, hospitals and clinics, parking lots and streets, and more. Customers include contract cleaners to whom organizations outsource facilities maintenance, as well as businesses that perform facilities maintenance themselves. The Company reaches these customers through the industry's largest direct sales and service organization and through a strong and well-supported network of authorized distributors worldwide.
Consolidation	Consolidation – The Consolidated Financial Statements include the accounts of Tennant Company and its subsidiaries. All intercompany transactions and balances have been eliminated. In these Notes to the Consolidated Financial Statements, Tennant Company is referred to as “Tennant,” “we,” “us,” or “our.”
Translations of Non-U.S. Currency	Translation of Non-U.S. Currency – Foreign currency-denominated assets and liabilities have been translated to U.S. dollars at year-end exchange rates, while income and expense items are translated at average exchange rates prevailing during the year. Gains or losses resulting from translation are included as a separate component of Accumulated Other Comprehensive Loss. The balance of cumulative foreign currency translation adjustments recorded within Accumulated Other Comprehensive Loss as of December 31, 2018 , 2017 and 2016 was a net loss of $31,831 , $15,778 and $44,444 , respectively. The majority of translation adjustments are not adjusted for income taxes as substantially all translation adjustments relate to permanent investments in non-U.S. subsidiaries. Net Foreign Currency Transaction Losses are included in Other Income (Expense).
Use of Estimates	Use of Estimates – In preparing the consolidated financial statements in conformity with U.S. generally accepted accounting principles ("U.S. GAAP"), management must make decisions that impact the reported amounts of assets, liabilities, revenues, expenses and the related disclosures, including disclosures of contingent assets and liabilities. Such decisions include the selection of the appropriate accounting principles to be applied and the assumptions on which to base accounting estimates. Estimates are used in determining, among other items, sales promotions and incentives accruals, inventory valuation, warranty reserves, allowance for doubtful accounts, pension and postretirement accruals, useful lives for intangible assets, and future cash flows associated with impairment testing for Goodwill and other long-lived assets. These estimates and assumptions are based on management’s best estimates and judgments. Management evaluates its estimates and assumptions on an ongoing basis using historical experience and other factors that management believes to be reasonable under the circumstances. We adjust such estimates and assumptions when facts and circumstances dictate. A number of these factors include, among others, economic conditions, credit markets, foreign currency, commodity cost volatility and consumer spending and confidence, all of which have combined to increase the uncertainty inherent in such estimates and assumptions. As future events and their effects cannot be determined with precision, actual amounts could differ significantly from those estimated at the time the consolidated financial statements are prepared. Changes in those estimates resulting from continuing changes in the economic environment will be reflected in the financial statements in future periods.
Cash and Cash Equivalents	Cash and Cash Equivalents – We consider all highly liquid investments with maturities of three months or less from the date of purchase to be cash equivalents.
Restricted Cash	Restricted Cash – We have a total of $525 as of December 31, 2018 that serves as collateral backing certain bank guarantees and is therefore restricted. This money is invested in time deposits.
Receivables	Receivables – Credit is granted to our customers in the normal course of business. Receivables are recorded at original carrying value less reserves for estimated uncollectible accounts and sales returns. To assess the collectability of these receivables, we perform ongoing credit evaluations of our customers’ financial condition. Through these evaluations, we may become aware of a situation where a customer may not be able to meet its financial obligations due to deterioration of its financial viability, credit ratings or bankruptcy. The reserve requirements are based on the best facts available to us and are reevaluated and adjusted as additional information becomes available. Our reserves are also based on amounts determined by using percentages applied to trade receivables. These percentages are determined by a variety of factors including, but not limited to, current economic trends, historical payment and bad debt write-off experience. An account is considered past-due or delinquent when it has not been paid within the contractual terms. Uncollectible accounts are written off against the reserves when it is deemed that a customer account is uncollectible.
Inventories	Inventories – Inventories are valued at the lower of cost or net realizable value. Cost is determined on a first-in, first-out (“FIFO”) basis except for Inventories in North America, which are determined on a last-in, first-out (“LIFO”) basis.
Property, Plant and Equipment	Property, Plant and Equipment – Property, plant and equipment is carried at cost. Additions and improvements that extend the lives of the assets are capitalized while expenditures for repairs and maintenance are expensed as incurred. We generally depreciate buildings and improvements by the straight-line method over a life of 30 years . Other property, plant and equipment are generally depreciated using the straight-line method based on lives of 3 years to 15 years .
Equity Method Investments	Equity Method Investment – Investments in which we have the ability to exercise significant influence, but do not control, are accounted for under the equity method of accounting and are included in Other Assets on the Consolidated Balance Sheets. Under this method of accounting, our share of the net earnings or losses of the investee are presented as a component of Other Expense, Net on the Consolidated Statements of Operations. The detail regarding our equity method investment in i-team North America B.V., a joint venture that operates as the distributor of the i-mop in North America, is further described in Note 5.
Goodwill	Goodwill – Goodwill represents the excess of cost over the fair value of net assets of businesses acquired. We analyze Goodwill on an annual basis as of year-end and when an event occurs or circumstances change that may reduce the fair value of one of our reporting units below its carrying amount. A goodwill impairment occurs if the carrying amount of a reporting unit exceeds its fair value. In assessing the recoverability of Goodwill, we use an analysis of qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount as a basis for determining whether it is necessary to perform the quantitative impairment test.
Intangible Assets	Intangible Assets – Intangible Assets consist of definite lived customer lists, trade names and technology. Generally, intangible assets classified as trade names are amortized on a straight-line basis and intangible assets classified as customer lists or technology are amortized using an accelerated method of amortization.
Impairment of Long-lived Assets and Assets Held for Sale	Impairment of Long-lived Assets and Assets Held for Sale – We periodically review our intangible and long-lived assets for impairment and assess whether events or circumstances indicate that the carrying amount of the assets may not be recoverable. We generally deem an asset group to be impaired if an estimate of undiscounted future operating cash flows is less than its carrying amount. If impaired, an impairment loss is recognized based on the excess of the carrying amount of the individual asset group over its fair value. Assets held for sale are measured at the lower of their carrying value or fair value less costs to sell. Upon retirement or disposition, the asset cost and related accumulated depreciation or amortization are removed from the accounts and a gain or loss is recognized based on the difference between the fair value of proceeds received and carrying value of the assets held for sale.
Purchase of Common Stock	Purchase of Common Stock – We repurchase our Common Stock under 2016 and 2015 repurchase programs authorized by our Board of Directors. These programs allow us to repurchase up to an aggregate of 1,392,892 shares of our Common Stock. Upon repurchase, the par value is charged to Common Stock and the remaining purchase price is charged to Additional Paid-in Capital. If the amount of the remaining purchase price causes the Additional Paid-in Capital account to be in a debit position, this amount is then reclassified to Retained Earnings. Common Stock repurchased is included in shares authorized but is not included in shares outstanding.
Warranty	Warranty – We record a liability for estimated warranty claims at the time of sale. The amount of the liability is based on the trend in the historical ratio of claims to sales, the historical length of time between the sale and resulting warranty claim, new product introductions and other factors. In the event we determine that our current or future product repair and replacement costs exceed our estimates, an adjustment to these reserves would be charged to earnings in the period such determination is made. Warranty terms on machines range from one to four years. However, the majority of our claims are paid out within the first six to nine months following a sale. The majority of the liability for estimated warranty claims represents amounts to be paid out in the near term for qualified warranty issues, with immaterial amounts reserved to be paid out for older equipment warranty issues.
Debt	Debt Issuance Costs – We record all applicable debt issuance costs related to a recognized debt liability in the Consolidated Balance Sheets as a direct deduction from the carrying amount of the debt liability, if not a line-of-credit arrangement. All debt issuance costs related to line-of-credit arrangements are recorded as part of Other Assets in the Consolidated Balance Sheets and subsequently amortized over the term of the line-of-credit arrangement. We amortize our debt issuance costs using the effective interest method over the term of the debt instrument or line-of-credit arrangement. Amortization of these costs is included as part of Interest Expense in the Consolidated Statements of Operations.
Environmental	Environmental – We record a liability for environmental clean-up on an undiscounted basis when a loss is probable and can be reasonably estimated.
Pension and Profit Sharing Plans	Pension and Profit Sharing Plans – Substantially all U.S. employees are covered by various retirement benefit plans, including postretirement medical plans and defined contribution savings plans. Pension plan costs are accrued based on actuarial estimates with the required pension cost funded annually, as needed. No new participants have entered the defined benefit pension plan since 2000 and no new participants have entered the postretirement medical plan since 1998. For further details regarding our pension and profit sharing plans, see Note 15.
Postretirement Benefits	Postretirement Benefits – We accrue and recognize the cost of retiree health benefits over the employees’ period of service based on actuarial estimates. Benefits are only available for U.S. employees hired before January 1, 1999.
Derivative Financial Instruments	Derivative Financial Instruments – In countries outside the U.S., we transact business in U.S. dollars and in various other currencies. We hedge our net recognized foreign currency denominated assets and liabilities with foreign exchange forward contracts to reduce the risk that the value of these assets and liabilities will be adversely affected by changes in exchange rates. We may also use foreign exchange option contracts or forward contracts to hedge certain cash flow exposures resulting from changes in foreign currency exchange rates. We enter into these foreign exchange contracts to hedge a portion of our forecasted currency denominated revenue in the normal course of business, and accordingly, they are not speculative in nature. We account for our foreign currency hedging instruments as either assets or liabilities on the balance sheet and measure them at fair value. Gains and losses resulting from changes in fair value are accounted for depending on the use of the derivative and whether it is designated and qualifies for hedge accounting. Gains and losses from foreign exchange forward contracts that hedge certain balance sheet positions are recorded each period to Net Foreign Currency Transaction Losses in our Consolidated Statements of Operations. Foreign exchange option contracts or forward contracts hedging forecasted foreign currency revenue are designated as cash flow hedges under accounting for derivative instruments and hedging activities, with gains and losses recorded each period to Accumulated Other Comprehensive Loss in our Consolidated Balance Sheets, until the forecasted transaction occurs. When the forecasted transaction occurs, we reclassify the related gain or loss on the cash flow hedge to Net Sales. In the event the underlying forecasted transaction does not occur, or it becomes probable that it will not occur, we reclassify the gain or loss on the related cash flow hedge from Accumulated Other Comprehensive Loss to Net Foreign Currency Transaction Losses in our Consolidated Statements of Operations at that time. If we do not elect hedge accounting, or the contract does not qualify for hedge accounting treatment, the changes in fair value from period to period are recorded in Net Foreign Currency Transaction Losses in our Consolidated Statements of Operations. See Note 13 for additional information regarding our hedging activities.
Revenue Recognition	Revenue Recognition – Revenue is recognized upon transfer of control of promised products or services to customers in an amount that reflects the consideration we expect to receive in exchange for those products and services. Generally, these criteria are met at the time the product is shipped. We also enter into contracts that can include combinations of products and services, which are generally capable of being distinct and are accounted for as separate performance obligations. Revenue is recognized net of allowances for returns and any taxes collected from customers, which are subsequently remitted to governmental authorities. Further details regarding revenue recognition are discussed in Notes 2 and 4.
Share-based Compensation	Share-based Compensation – We account for employee share-based compensation using the fair value based method. Our share-based compensation plans are more fully described in Note 19.
Research and Development	Research and Development – Research and development costs are expensed as incurred.
Advertising Costs	Advertising Costs – We advertise products, technologies and solutions to customers and prospective customers through a variety of marketing campaign and promotional efforts. These efforts include tradeshows, online advertising, e-mail marketing, mailings, sponsorships and telemarketing. Advertising costs are expensed as incurred. In 2018 , 2017 and 2016 , such activities amounted to $8,767 , $8,228 and $7,269 , respectively.
Income Taxes	Income Taxes – Deferred tax assets and liabilities are recognized for the expected future tax consequences of temporary differences between the book and tax bases of existing assets and liabilities. A valuation allowance is provided when, in management’s judgment, it is more likely than not that some portion or all of the deferred tax asset will not be realized. We have established contingent tax liabilities using management’s best judgment. We follow guidance provided by Accounting Standards Codification ("ASC") 740, Income Taxes , regarding uncertainty in income taxes, to record these contingent tax liabilities (refer to Note 18 for additional information). We adjust these liabilities as facts and circumstances change. Interest Expense is recognized in the first period the interest would begin accruing. Penalties are recognized in the period we claim or expect to claim the position in our tax return. Interest and penalty expenses are classified as an income tax expense.
Sales Tax	Sales Tax – Sales taxes collected from customers and remitted to governmental authorities are presented on a net basis.
Earnings per Share	Earnings per Share – Basic earnings (loss) per share is computed by dividing Net Earnings (Loss) Attributable to Tennant Company by the Weighted Average Shares Outstanding during the period. Diluted earnings per share assumes conversion of potentially dilutive stock options, performance shares, restricted shares and restricted stock units. These conversions are not included in our computation of diluted earnings per share if we have a net loss attributable to Tennant Company in a reporting period, as the effects are anti-dilutive.
New Accounting Pronouncements	New Accounting Pronouncements - In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) . This ASU changes current U.S. GAAP for lessees to recognize lease assets and lease liabilities on the balance sheet for those leases classified as operating leases under previous U.S. GAAP. Under the new guidance, lessor accounting is largely unchanged. The amendments in this ASU are effective for annual periods beginning after December 15, 2018, including interim periods within that reporting period, which is our fiscal 2019. We have elected to apply the standard on a prospective basis with an adjustment to retained earnings in the first period of adoption. We have also elected the package of practical expedients, which permits us not to reassess our prior conclusions about lease identification, lease classification and initial direct costs. In addition, we have elected the short-term lease recognition whereby we will not recognize operating lease related assets or liabilities for leases with a lease term less than one year. We have also elected to not separate lease and non-lease components for all of our leases. We will not be electing the hindsight practical expedient to determine the reasonably certain term of existing leases. We are continuing to evaluate the impact of this amended guidance on our consolidated financial statements and related disclosures. We expect the adoption of this standard will have a material impact on the consolidated balance sheets for recognition of operating lease related assets and liabilities. We do not expect a material impact to the consolidated statements of operations. We are unable to quantify the impact at this time as the lease software required to calculate the impact due to the volume of our lease data has not yet been implemented. We are also in the process of implementing controls to ensure compliance with the new lease accounting standard. We expect to be complete with implementation activities by the end of the first quarter of 2019 and will provide appropriate disclosures at that time.

Newly Adopted Accounting Pron_2

Newly Adopted Accounting Pronouncements (Tables)	12 Months Ended
	Dec. 31, 2018
Accounting Changes and Error Corrections [Abstract]
Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]	The reclassification from Accounts Receivable to Other Current Liabilities in accordance with the detail described above impacted the Condensed Consolidated Balance Sheet as of December 31, 2018, as follows (in thousands): As Reported Balance Without Adoption of ASC 606 Effect of Change Higher/(Lower) ASSETS Accounts Receivable $ 216,170 $ 214,858 $ 1,312 Total Current Assets 468,644 467,332 $ 1,312 Total Assets $ 992,544 $ 991,232 $ 1,312 LIABILITIES Other Current Liabilities $ 71,895 $ 70,583 $ 1,312 Total Current Liabilities 248,874 247,562 $ 1,312 Total Liabilities $ 676,192 $ 674,880 $ 1,312

Revenue from Contracts with C_2

Revenue from Contracts with Customers (Tables)	12 Months Ended
	Dec. 31, 2018
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue [Table Text Block]	The following tables illustrate the disaggregation of revenue by geographic area, groups of similar products and services and sales channels for the twelve months ended December 31, 2018 , 2017 and 2016 (in thousands): Net Sales by geographic area Twelve Months Ended December 31 2018 2017 2016 Americas $ 690,996 $ 640,274 $ 607,026 Europe, Middle East and Africa 335,603 273,738 129,046 Asia Pacific 96,912 89,054 72,500 Total $ 1,123,511 $ 1,003,066 $ 808,572 Net Sales are attributed to each geographic area based on the end user country and are net of intercompany sales. Net Sales by groups of similar products and services Twelve Months Ended December 31 2018 2017 2016 Equipment $ 729,993 $ 636,875 $ 491,075 Parts and Consumables 222,345 202,452 173,632 Specialty Surface Coatings 29,827 31,407 29,146 Service and Other 141,346 132,332 114,719 Total $ 1,123,511 $ 1,003,066 $ 808,572 Net Sales by sales channel Twelve Months Ended December 31 2018 2017 2016 Sales Direct to Consumer $ 735,244 $ 674,495 $ 609,538 Sales to Distributors 388,267 328,571 199,034 Total $ 1,123,511 $ 1,003,066 $ 808,572
Contract with Customer, Asset and Liability [Table Text Block]	The change in our sales incentive accrual balance for the twelve months ended December 31, 2018 was as follows: Twelve Months Ended December 31 2018 Beginning balance $ 13,466 Additions to sales incentive accrual 30,458 Contract payments (26,992 ) Foreign currency fluctuations (280 ) Ending balance $ 16,652
Deferred Revenue, by Arrangement, Disclosure [Table Text Block]	The change in the deferred revenue balance for the twelve months ended December 31, 2018 was as follows: Twelve Months Ended December 31 2018 Beginning balance $ 7,787 Increase in deferred revenue representing our obligation to satisfy future performance obligations 14,650 Decrease in deferred revenue for amounts recognized in Net Sales for satisfied performance obligations (13,755 ) Foreign currency fluctuations (157 ) Ending balance $ 8,525
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block]	At December 31, 2018 , $5,021 and $3,504 of deferred revenue was reported in Other Current Liabilities and Other Liabilities, respectively, on our Condensed Consolidated Balance Sheets. Of this, we expect to recognize the following approximate amounts in Net Sales in the following periods: 2019 $ 5,021 2020 1,865 2021 1,044 2022 442 2023 153 Thereafter — Total $ 8,525

Management Actions (Tables)

Management Actions (Tables)	12 Months Ended
	Dec. 31, 2018
Restructuring and Related Activities [Abstract]
Reconciliation of beginning and ending liability balances	A reconciliation to the ending liability balance of severance and related costs as of December 31, 2018 is as follows: Severance and Related Costs 2017 restructuring actions $ 9,558 Cash payments (6,312 ) Foreign currency adjustments 190 December 31, 2017 Balance 3,436 2018 charges and utilization: New charges 1,032 Cash payments (2,123 ) Foreign currency adjustments (97 ) December 31, 2018 Balance $ 2,248

Acquisitions (Tables)

Acquisitions (Tables)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Business Combinations [Abstract]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	The following table summarizes the final fair value measurement of the assets acquired and liabilities assumed as of the date of acquisition: ASSETS Receivables $ 39,984 Inventories 46,442 Other Current Assets 7,456 Assets Held for Sale 2,247 Property, Plant and Equipment 63,890 Intangible Assets Subject to Amortization: Trade Name 26,753 Customer Lists 123,061 Technology 9,631 Other Assets 2,000 Total Identifiable Assets Acquired 321,464 LIABILITIES Accounts Payable 32,227 Accrued Expenses 18,130 Deferred Income Taxes 56,950 Other Liabilities 10,964 Total Identifiable Liabilities Assumed 118,271 Net Identifiable Assets Acquired 203,193 Noncontrolling Interest (1,896 ) Goodwill 152,472 Total Estimated Purchase Price, net of Cash Acquired $ 353,769
Schedule of Pro Forma Financial Information		The following unaudited pro forma financial information presents the combined results of operations of Tennant Company as if the acquisition of IPC Group had occurred as of January 1, 2016: Years ended December 31 2017 2016 Net Sales Pro forma $ 1,057,127 $ 1,013,710 As reported 1,003,066 808,572 Net Earnings (Loss) Attributable to Tennant Company Pro forma $ 12,288 $ 30,412 As reported (6,195 ) 46,614 Net Earnings (Loss) Attributable to Tennant Company per Diluted Share Pro forma $ 0.68 $ 1.69 As reported (0.35 ) 2.59

Inventories (Tables)

Inventories (Tables)	12 Months Ended
	Dec. 31, 2018
Inventory Disclosure [Abstract]
Inventories	Inventories as of December 31 consisted of the following: 2018 2017 Inventories carried at LIFO: Finished goods $ 48,607 $ 43,439 Raw materials, production parts and work-in-process 28,581 23,694 Excess of FIFO over LIFO cost (a) (31,199 ) (28,429 ) Total LIFO inventories $ 45,989 $ 38,704 Inventories carried at FIFO: Finished goods $ 53,520 $ 54,161 Raw materials, production parts and work-in-process 35,624 34,829 Total FIFO inventories $ 89,144 $ 88,990 Total inventories $ 135,133 $ 127,694

Property, Plant and Equipment (

Property, Plant and Equipment (Tables)	12 Months Ended
	Dec. 31, 2018
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	Property, Plant and Equipment and related Accumulated Depreciation, including equipment under capital leases, as of December 31, consisted of the following: 2018 2017 Property, Plant and Equipment: Land $ 17,857 $ 18,152 Buildings and improvements 93,729 96,230 Machinery and manufacturing equipment 154,118 151,645 Office equipment 111,219 107,312 Work in progress 9,718 9,429 Total Property, Plant and Equipment 386,641 382,768 Less: Accumulated Depreciation (223,194 ) (202,750 ) Property, Plant and Equipment, Net $ 163,447 $ 180,018

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Changes in the carrying amount of Goodwill	The changes in the carrying amount of Goodwill are as follows: Goodwill Accumulated Impairment Losses Total Balance as of December 31, 2016 $ 58,397 $ (37,332 ) $ 21,065 Additions 147,845 — 147,845 Purchase accounting adjustments (1,865 ) — (1,865 ) Foreign currency fluctuations 22,847 (3,848 ) 18,999 Balance as of December 31, 2017 $ 227,224 $ (41,180 ) $ 186,044 Additions — — — Purchase accounting adjustments 4,627 — 4,627 Foreign currency fluctuations (10,141 ) 2,142 (8,000 ) Balance as of December 31, 2018 $ 221,710 $ (39,038 ) $ 182,671
Acquired Intangible Assets excluding Goodwill		The balances of acquired Intangible Assets, excluding Goodwill, as of December 31, are as follows: Customer Lists Trade Names Technology Total Balance as of December 31, 2018 Original cost $ 143,059 $ 30,592 $ 17,436 $ 191,087 Accumulated amortization (33,714 ) (5,327 ) (5,500 ) (44,541 ) Carrying amount $ 109,345 $ 25,265 $ 11,936 $ 146,546 Weighted-average original life (in years) 15 10 10 Balance as of December 31, 2017 Original cost $ 149,355 $ 31,968 $ 14,589 $ 195,912 Accumulated amortization (17,870 ) (2,436 ) (3,259 ) (23,565 ) Carrying amount $ 131,485 $ 29,532 $ 11,330 $ 172,347 Weighted-average original life (in years) 15 10 11
Estimated aggregate amortization expense of Intangible Assets	Estimated aggregate amortization expense based on the current carrying amount of amortizable Intangible Assets for each of the five succeeding years is as follows: 2019 $ 21,297 2020 19,873 2021 18,092 2022 15,913 2023 14,352 Thereafter 57,019 Total $ 146,546

Debt (Tables)

Debt (Tables)	12 Months Ended
	Dec. 31, 2018
Debt Disclosure [Abstract]
Short-term and Long-term Debt	Debt outstanding at December 31, consisted of the following: 2018 2017 Bank Borrowings $ 3,926 $ — Senior Unsecured Notes 300,000 300,000 Credit Facility Borrowings 53,000 80,000 Capital Lease Obligations 2,863 3,279 Unamortized Debt Issuance Costs (4,724 ) (6,440 ) Total Debt 355,065 376,839 Less: Current Maturities of Credit Facility Borrowings, Net of Debt Issuance Costs (1) (27,005 ) (30,883 ) Long-term portion $ 328,060 $ 345,956 (1) Current maturities of debt include $25,927 of current maturities, less $184 of unamortized debt issuance costs, under our 2017 Credit Agreement and $1,262 of current maturities of capital lease obligations.
Aggregate maturities of outstanding debt including capital lease obligations	he aggregate maturities of our outstanding debt, excluding unamortized debt issuance costs, as of December 31, 2018 , are as follows: 2019 $ 12,066 2020 10,297 2021 6,255 2022 31,171 2023 — Thereafter 300,000 Total aggregate maturities $ 359,789

Other Current Liabilities (Tabl

Other Current Liabilities (Tables)	12 Months Ended
	Dec. 31, 2018
Other Liabilities, Current [Abstract]
Other Current Liabilities	Other Current Liabilities as of December 31 consisted of the following: 2018 2017 Other Current Liabilities: Taxes, other than income taxes $ 12,763 $ 14,760 Warranty 13,062 12,676 Deferred revenue 5,021 5,815 Rebates 16,652 13,466 Freight 4,475 3,208 Restructuring 2,248 4,267 Miscellaneous accrued expenses 13,117 10,779 Other 4,557 4,476 Total Other Current Liabilities $ 71,895 $ 69,447
Changes in warranty reserves	The changes in warranty reserves for the three years ended December 31 were as follows: 2018 2017 2016 Beginning balance $ 12,676 $ 10,960 $ 10,093 Product warranty provision 13,172 12,124 12,413 Acquired warranty obligations — 1,208 42 Foreign currency (172 ) 274 82 Claims paid (12,614 ) (11,890 ) (11,670 ) Ending balance $ 13,062 $ 12,676 $ 10,960

Derivatives (Tables)

Derivatives (Tables)	12 Months Ended
	Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Instruments in Balance Sheet, Fair Value	The fair value of derivative instruments on our Consolidated Balance Sheets as of December 31 consisted of the following: 2018 2017 Fair Value Asset Derivatives Fair Value Liability Derivatives Fair Value Asset Derivatives Fair Value Liability Derivatives Derivatives designated as hedging instruments: Foreign currency option contracts (1) $ 245 $ — $ 86 $ — Foreign currency forward contracts (1) 6,987 25,415 7,218 34,961 Derivatives not designated as hedging instruments: Foreign currency forward contracts (1) $ 223 $ — $ 442 $ 425 (1) Contracts that mature within the next 12 months are included in Other Current Assets and Other Current Liabilities for asset derivatives and liabilities derivatives, respectively, on our Consolidated Balance Sheets. Contracts with maturities greater than 12 months are included in Other Assets and Other Liabilities for asset derivatives and liability derivatives, respectively, in our Consolidated Balance Sheets. Amounts included in our Consolidated Balance Sheets are recorded net where a right of offset exists with the same derivative counterparty.
Schedule of Derivative Instruments, Gain (Loss)	The effect of foreign currency derivative instruments designated as cash flow hedges and foreign currency derivative instruments not designated as hedges in our Consolidated Statements of Earnings for the three years ended December 31 were as follows: 2018 2017 2016 Foreign Currency Option Contracts Foreign Currency Forward Contracts Foreign Currency Option Contracts Foreign Currency Forward Contracts Foreign Currency Option Contracts Foreign Currency Forward Contracts Derivatives in cash flow hedging relationships: Net gain (loss) recognized in Other Comprehensive Income (Loss), net of tax (1) $ 100 $ 9,025 $ (193 ) $ (16,226 ) $ (259 ) $ (73 ) Net (loss) gain reclassified from Accumulated Other Comprehensive Loss into earnings, net of tax, effective portion to Net Sales (110 ) (18 ) (178 ) (37 ) (148 ) 7 Net gain reclassified from Accumulated Other Comprehensive Loss in earnings, net of tax, effective portion to Interest Income — 1,870 — 1,198 — — Net gain (loss) reclassified from Accumulated Other Comprehensive Loss into earnings, net of tax, effective portion to Net Foreign Currency Transaction Losses — 6,353 — (12,555 ) — — Net gain (loss) recognized in earnings (2) 8 12 (13 ) 10 (11 ) 2 Derivatives not designated as hedging instruments: Net loss recognized in earnings (3) $ — $ (2,518 ) $ — $ (6,161 ) $ — $ (890 ) (1) Net change in the fair value of the effective portion classified in Other Comprehensive Income (Loss). (2) Ineffective portion and amount excluded from effectiveness testing classified in Net Foreign Currency Transaction Losses. (3) Classified in Net Foreign Currency Transaction Losses.

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Fair value measurements of assets and liabilities	Our population of assets and liabilities subject to fair value measurements at December 31, 2018 is as follows: Fair Value Level 1 Level 2 Level 3 Assets: Foreign currency forward exchange contracts $ 7,210 $ — $ 7,210 $ — Foreign currency option contracts 245 — 245 — Total Assets $ 7,455 $ — $ 7,455 $ — Liabilities: Foreign currency forward exchange contracts $ 25,415 $ — $ 25,415 $ — Total Liabilities $ 25,415 $ — $ 25,415 $ —	Our population of assets and liabilities subject to fair value measurements at December 31, 2017 is as follows: Fair Value Level 1 Level 2 Level 3 Assets: Foreign currency forward exchange contracts $ 7,660 $ — $ 7,660 $ — Foreign currency option contracts 86 — 86 — Total Assets $ 7,746 $ — $ 7,746 $ — Liabilities: Foreign currency forward exchange contracts $ 35,386 $ — $ 35,386 $ — Total Liabilities $ 35,386 $ — $ 35,386 $ —

Retirement Benefit Plans (Table

Retirement Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2018
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 as of December 31, 2018 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 $ 6,408 $ 6,408 $ — $ — Investment Account held by Pension Plan (1) 10,842 — — 10,842 Total $ 17,250 $ 6,408 $ — $ 10,842 (1) This category is comprised of investments in insurance contracts. Weighted-average asset allocations by asset category of the U.K. Pension Plan and the Tennant Company Retirement Savings Plan 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.
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 December 31 are as follows: 2018 2017 Fair value at beginning of year $ 11,163 $ 9,562 Purchases, sales, issuances and settlements, net (856 ) (535 ) Net gain 1,138 1,190 Foreign currency (603 ) 946 Fair value at end of year $ 10,842 $ 11,163
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 2018 2017 2018 2017 2018 2017 Discount rate 3.95 % 3.28 % 2.72 % 2.45 % 3.95 % 3.26 % Rate of compensation increase — % — % 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 2018 2017 2016 2018 2017 2016 2018 2017 2016 Discount rate 3.28 % 3.92 % 4.08 % 2.45 % 2.64 % 3.59 % 3.26 % 3.58 % 3.70 % Expected long-term rate of return on plan assets — % 5.10 % 5.20 % 3.80 % 3.90 % 4.60 % — — — Rate of compensation increase — % — % 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: 2018 2017 U.S. Pension Plans $ 1,267 $ 1,414 U.K. Pension Plan 9,264 11,131 German Pension Plan 950 1,013
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: 2018 2017 Accumulated benefit obligation $ 2,217 $ 2,427 Fair value of plan assets — —
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: 2018 2017 Projected benefit obligation $ 2,217 $ 2,427 Fair value of plan assets — —
Assumed healthcare cost trend rates	Assumed healthcare cost trend rates as of December 31 are as follows: 2018 2017 Healthcare cost trend rate assumption for the next year 6.38 % 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 2032
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 $ (26 ) $ 29 Effect on postretirement benefit obligation $ (599 ) $ 672
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 2018 2017 2018 2017 2018 2017 Change in benefit obligation: Benefit obligation at beginning of year $ 1,414 $ 40,961 $ 12,144 $ 11,136 $ 9,604 $ 10,540 Service cost — — 126 132 45 60 Interest cost 43 1,538 280 298 293 363 Plan participants' contributions — — 13 14 — — Plan amendments — — 109 — — — Actuarial loss (gain) 35 1,811 (514 ) 327 (485 ) (524 ) Foreign exchange — — (583 ) 1,097 — — Benefits paid (149 ) (1,950 ) (1,196 ) (860 ) (844 ) (835 ) Settlement (76 ) (40,946 ) — — — — Curtailment — — (165 ) — — — Benefit obligation at end of year $ 1,267 $ 1,414 $ 10,214 $ 12,144 $ 8,613 $ 9,604 Change in fair value of plan assets and net accrued liabilities: Fair value of plan assets at beginning of year $ — $ 46,389 $ 11,163 $ 9,562 $ — $ — Actual return on plan assets — 2,536 1,138 1,189 — — Employer contributions 225 276 327 313 844 835 Plan participants' contributions — — 13 14 — — Excess assets transferred to Defined Contribution Plan — (6,305 ) — — — — Foreign exchange — — (603 ) 945 — — Benefits paid (149 ) (1,950 ) (1,196 ) (860 ) (844 ) (835 ) Settlement (76 ) (40,946 ) — — — — Fair value of plan assets at end of year — — 10,842 11,163 — — Funded status at end of year $ (1,267 ) $ (1,414 ) $ 628 $ (981 ) $ (8,613 ) $ (9,604 ) Amounts recognized in the Consolidated Balance Sheets consist of: Noncurrent Other Assets $ — $ — $ 1,578 $ — $ — $ — Current Liabilities (146 ) (140 ) (34 ) (36 ) (779 ) (771 ) Long-Term Liabilities (1,121 ) (1,274 ) (916 ) (945 ) (7,834 ) (8,833 ) Net accrued (liability) asset $ (1,267 ) $ (1,414 ) $ 628 $ (981 ) $ (8,613 ) $ (9,604 ) Amounts recognized in Accumulated Other Comprehensive Loss consist of: Prior service cost $ — $ — $ (109 ) $ — $ — $ — Net actuarial (loss) gain (852 ) (915 ) 42 (1,245 ) 444 (41 ) Accumulated Other Comprehensive (Loss) Income $ (852 ) $ (915 ) $ (67 ) $ (1,245 ) $ 444 $ (41 )
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 2018 2017 2016 2018 2017 2016 2018 2017 2016 Service cost $ — $ — $ 354 $ 126 $ 132 $ 103 $ 45 $ 60 $ 76 Interest cost 43 1,538 1,659 280 298 358 293 363 396 Expected return on plan assets — (2,336 ) (2,400 ) (403 ) (379 ) (452 ) — — — Amortization of net actuarial loss 49 43 41 38 74 27 — — — Amortization of prior service cost — — 41 — — — — — — Foreign currency — — — 35 (1 ) 97 — — — Net periodic benefit cost (credit) 92 (755 ) (305 ) 76 124 133 338 423 472 Curtailment — — — (165 ) — — — — — Settlement 49 6,373 — — — — — — — Net benefit cost (credit) $ 141 $ 5,618 $ (305 ) $ (89 ) $ 124 $ 133 $ 338 $ 423 $ 472
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 2018 2017 2016 2018 2017 2016 2018 2017 2016 Prior service cost $ — $ — $ — $ 109 $ — $ — $ — $ — $ — Net actuarial loss (gain) 35 1,611 633 (1,249 ) (465 ) 1,718 (485 ) (524 ) 6 Amortization of prior service cost — — (41 ) (19 ) — — — — — Amortization of net actuarial loss (49 ) (43 ) (41 ) (38 ) (74 ) (27 ) — — — Settlement (49 ) (6,373 ) — — — — — — — Total recognized in other comprehensive (income) loss $ (63 ) $ (4,805 ) $ 551 $ (1,197 ) $ (539 ) $ 1,691 $ (485 ) $ (524 ) $ 6 Total recognized in net benefit cost (credit) and other comprehensive (income) loss $ 78 $ 813 $ 246 $ (1,286 ) $ (415 ) $ 1,824 $ (147 ) $ (101 ) $ 478
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 2019 $ 146 $ 243 $ 779 2020 138 249 830 2021 129 257 752 2022 121 265 755 2023 112 275 715 2024 to 2028 468 1,511 3,424 Total $ 1,114 $ 2,800 $ 7,255
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, 2018 and are expected to be recognized as components of net periodic benefit cost during 2019 : Pension Benefits Postretirement Medical Benefits Net actuarial loss $ 104 $ — Transition obligation 4 —

Shareholders' Equity (Tables)

Shareholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2018
Stockholders' Equity Note [Abstract]
Components of Accumulated Other Comprehensive Loss, net of tax	Components of Accumulated Other Comprehensive Loss, net of tax, within the Consolidated Balance Sheets and Consolidated Statements of Equity as of December 31 are as follows: 2018 2017 2016 Foreign currency translation adjustments $ (31,831 ) $ (15,778 ) $ (44,444 ) Pension and retiree medical benefits (332 ) (1,610 ) (5,391 ) Cash flow hedge (5,031 ) (4,935 ) (88 ) Total Accumulated Other Comprehensive Loss $ (37,194 ) $ (22,323 ) $ (49,923 )
Changes in components of Accumulated Other Comprehensive Loss, net of tax	The changes in components of Accumulated Other Comprehensive Loss, net of tax, are as follows: Foreign Currency Translation Adjustments Pension and Postretirement Benefits Cash Flow Hedge Total December 31, 2017 $ (15,778 ) $ (1,610 ) $ (4,935 ) $ (22,323 ) Other comprehensive (loss) income before reclassifications (16,053 ) 1,293 9,125 (5,635 ) Amounts reclassified from Accumulated Other Comprehensive Loss — 122 (8,095 ) (7,973 ) Adjustments to Accumulated Other Comprehensive Loss for disproportionate income tax effects recognized from the adoption of ASU 2018-02 — (137 ) (1,126 ) (1,263 ) Net current period other comprehensive (loss) income (16,053 ) 1,278 (96 ) (14,871 ) December 31, 2018 $ (31,831 ) $ (332 ) $ (5,031 ) $ (37,194 )

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Minimum rentals for aggregate lease commitments	The minimum rentals for aggregate lease commitments as of December 31, 2018 were as follows: 2019 $ 15,200 2020 8,973 2021 5,535 2022 3,592 2023 2,636 Thereafter 4,215 Total $ 40,151

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income from continuing operations	Income from continuing operations for the three years ended December 31 was as follows: 2018 2017 2016 U.S. operations $ 23,913 $ 7,465 $ 54,018 Foreign operations 11,929 (8,757 ) 12,473 Total $ 35,842 $ (1,292 ) $ 66,491
Income tax expense (benefit)	Income tax expense (benefit) for the three years ended December 31 was as follows: 2018 2017 2016 Current: Federal $ 3,731 $ 2,590 $ 15,962 Foreign 7,030 8,701 3,035 State 1,033 812 1,859 $ 11,794 $ 12,103 $ 20,856 Deferred: Federal $ (3,135 ) $ 1,640 $ (472 ) Foreign (6,012 ) (8,699 ) (434 ) State (343 ) (131 ) (73 ) $ (9,490 ) $ (7,190 ) $ (979 ) Total: Federal $ 596 $ 4,230 $ 15,490 Foreign 1,018 2 2,601 State 690 681 1,786 Total Income Tax Expense $ 2,304 $ 4,913 $ 19,877
Effective tax rate reconciliation	Our effective income tax rate varied from the U.S. federal statutory tax rate for the three years ended December 31 as follows: 2018 2017 2016 Tax at statutory rate 21.0 % 35.0 % 35.0 % (Decreases) increases in the tax rate from: State and local taxes, net of federal benefit 1.4 (21.1 ) 1.7 Effect of foreign operations (4.3 ) (70.8 ) (5.5 ) Transaction costs (4.2 ) (226.3 ) — Effect of 2017 deferred rate change (1.0 ) (154.3 ) — Transition Tax (1.0 ) (28.0 ) — Effect of changes in valuation allowances 6.6 (126.5 ) 1.9 Domestic production activities deduction 0.4 28.3 (2.2 ) Share-based payments (5.7 ) 90.4 — Research & Development credit (3.6 ) 82.9 (1.3 ) Other, net (3.2 ) 10.2 0.3 Effective income tax rate 6.4 % (380.2 )% 29.9 %
Deferred tax assets and liabilities	Deferred tax assets and liabilities were comprised of the following as of December 31: 2018 2017 Deferred Tax Assets: Inventories, principally due to changes in inventory reserves $ 3,335 $ 4,757 Employee wages and benefits, principally due to accruals for financial reporting purposes 11,642 11,031 Warranty reserves accrued for financial reporting purposes 2,610 2,578 Receivables, principally due to allowance for doubtful accounts and tax accounting method for equipment rentals 1,728 2,138 Tax loss carryforwards 7,765 11,383 Tax credit carryforwards 4,708 1,575 Other 4,712 3,630 Gross Deferred Tax Assets $ 36,500 $ 37,092 Less: valuation allowance (11,519 ) (9,691 ) Total Net Deferred Tax Assets $ 24,981 $ 27,401 Deferred Tax Liabilities: Property, Plant and Equipment, principally due to differences in depreciation and related gains 9,882 9,042 Goodwill and Intangible Assets 45,628 60,450 Total Deferred Tax Liabilities $ 55,510 $ 69,492 Net Deferred Tax Liabilities $ (30,529 ) $ (42,091 )
Reconciliation of unrecognized tax benefits	A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows: 2018 2017 Balance at January 1 $ 2,232 $ 2,477 Increases as a result of tax positions taken during a prior period 74 — Increases as a result of tax positions taken during the current year 370 329 Increase related to prior period tax positions of acquired entities 3,833 236 Decreases relating to settlement with tax authorities — (68 ) Reductions as a result of a lapse of the applicable statute of limitations (1,274 ) (770 ) Increases as a result of foreign currency fluctuations 418 28 Balance at December 31 $ 5,653 $ 2,232

Share-Based Compensation (Table

Share-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2016
Share-based Compensation [Abstract]
Assumptions used for the grants	The following table illustrates the valuation assumptions used for the 2018 , 2017 and 2016 grants: 2018 2017 2016 Expected volatility 25% 25 - 26% 29 -32% Weighted-average expected volatility 25% 26% 32% Expected dividend yield 1.2% 1.2 - 1.3% 1.3 - 1.5% Weighted-average expected dividend yield 1.2% 1.3% 1.3% Expected term, in years 5 5 5 Risk-free interest rate 2.6 - 2.9% 1.7 - 2.0% 1.1 - 1.4%
Stock option activity	The following table summarizes the activity during the year ended December 31, 2018 for stock option awards: Shares Weighted-Average Exercise Price Outstanding at beginning of year 1,135,608 $ 47.47 Granted 202,623 67.85 Exercised (223,352 ) 26.33 Forfeited (30,312 ) 66.06 Outstanding at end of year 1,084,567 $ 55.11 Exercisable at end of year 711,499 $ 48.94
Nonvested restricted share awards activity		The following table summarizes the activity during the year ended December 31, 2018 for nonvested restricted share awards: Shares Weighted-Average Grant Date Fair Value Nonvested at beginning of year 99,789 $ 53.11 Granted 16,377 67.70 Vested (14,384 ) 68.00 Forfeited (1,561 ) 67.39 Nonvested at end of year 100,221 $ 53.52
Nonvested performance share awards activity	The following table summarizes the activity during the year ended December 31, 2018 for nonvested performance share awards: Shares Weighted-Average Grant Date Fair Value Nonvested at beginning of year 123,024 $ 63.09 Granted 47,997 67.84 Forfeited (43,974 ) 66.23 Nonvested at end of year 127,047 $ 63.80
Nonvested restricted stock units activity	The following table summarizes the activity during the year ended December 31, 2018 for nonvested restricted stock units: Shares Weighted-Average Grant Date Fair Value Nonvested at beginning of year 43,125 $ 64.67 Granted 83,380 66.83 Vested (15,427 ) 58.27 Forfeited (9,123 ) 66.60 Nonvested at end of year 101,955 $ 67.23

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2018
Earnings Per Share [Abstract]
Computation of Basic and Diluted Earnings per Share	The computations of Basic and Diluted Earnings (Loss) Attributable to Tennant Company per Share for the years ended December 31 were as follows: 2018 2017 2016 Numerator: Net Earnings (Loss) Attributable to Tennant Company $ 33,412 $ (6,195 ) $ 46,614 Denominator: Basic - Weighted Average Shares Outstanding 17,940,438 17,695,390 17,523,267 Effect of dilutive securities 398,131 — 452,916 Diluted - Weighted Average Shares Outstanding 18,338,569 17,695,390 17,976,183 Basic Earnings (Loss) per Share $ 1.86 $ (0.35 ) $ 2.66 Diluted Earnings (Loss) per Share $ 1.82 $ (0.35 ) $ 2.59

Segment Reporting (Tables)

Segment Reporting (Tables)	12 Months Ended
	Dec. 31, 2018
Segment Reporting [Abstract]
Financial information by operating segment	The following table presents Net Sales by geographic area for the years ended December 31: 2018 2017 2016 Net Sales: Americas $ 690,996 $ 640,274 $ 607,026 Europe, Middle East, Africa 335,603 273,738 129,046 Asia Pacific 96,912 89,054 72,500 Total $ 1,123,511 $ 1,003,066 $ 808,572 The following table presents long-lived assets by geographic area as of December 31: 2018 2017 2016 Long-lived assets: Americas $ 118,609 $ 132,659 $ 134,737 Europe, Middle East, Africa 385,659 422,338 19,606 Asia Pacific 4,145 4,731 4,334 Total $ 508,413 $ 559,728 $ 158,677
Net Sales by groups of similar products and services	The following table presents revenues for groups of similar products and services for the years ended December 31: 2018 2017 2016 Net Sales: Equipment $ 729,993 $ 636,875 $ 491,075 Parts and consumables 222,345 202,452 173,632 Service and other 141,346 132,332 114,719 Specialty surface coatings 29,827 31,407 29,146 Total $ 1,123,511 $ 1,003,066 $ 808,572

Consolidated Quarterly Data (Ta

Consolidated Quarterly Data (Tables)	12 Months Ended
	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Consolidated Quarterly Data (Unaudited)	Consolidated Quarterly Data (Unaudited) 2018 Q1 Q2 Q3 Q4 Net Sales $ 272,847 $ 292,197 $ 273,255 $ 285,212 Gross Profit 109,116 (a) 117,225 (a) 106,509 (a) 112,172 Net Earnings Attributable to Tennant Company 3,274 12,744 9,676 7,717 Basic Earnings Attributable to Tennant Company per Share $ 0.18 $ 0.71 $ 0.54 $ 0.43 Diluted Earnings Attributable to Tennant Company per Share $ 0.18 $ 0.69 $ 0.52 $ 0.42 (a) Amounts have been revised for misclassifications between Cost of Sales and Selling and Administrative Expense. See Note 3 for further information. Gross Profit was reduced by $1,521, $1,574, and $1,576 for Q1 2018, Q2 2018 and Q3 2018, respectively, and Selling and Administrative Expense was decreased by the same amounts during those periods. 2017 Q1 Q2 Q3 Q4 Net Sales $ 191,059 $ 270,791 $ 261,921 $ 279,295 Gross Profit 79,736 103,130 (a) 103,081 (a) 113,866 (a) Net (Loss) Earnings Attributable to Tennant Company (3,957 ) (2,591 ) 3,559 (3,206 ) Basic (Loss) Earnings Attributable to Tennant Company per Share $ (0.22 ) $ (0.15 ) $ 0.20 $ (0.18 ) Diluted (Loss) Earnings Attributable to Tennant Company per Share $ (0.22 ) $ (0.15 ) $ 0.20 $ (0.18 )

Separate Financial Informatio_2

Separate Financial Information of Guarantor Subsidiaries (Tables)	12 Months Ended
	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Condensed Income Statement	The following condensed consolidated financial information presents the Condensed Consolidated Statements of Earnings, Comprehensive Income and Cash Flows for each of the years in the three year period ended December 31, 2018 , and the related Condensed Consolidated Balance Sheets as of December 31, 2018 and 2017 , of Tennant Company ("Parent"), the Guarantor Subsidiaries on a combined basis, the Non-Guarantor Subsidiaries on a combined basis and elimination entries necessary to consolidate the Parent with the Guarantor and Non-Guarantor Subsidiaries. The following condensed consolidated financial statements should be read in conjunction with the consolidated financial statements of the company and notes thereto of which this note is an integral part. Condensed Consolidated Statement of Earnings For the year ended December 31, 2018 (in thousands) Parent Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Total Tennant Company Net Sales $ 494,341 $ 634,341 $ 570,627 $ (575,798 ) $ 1,123,511 Cost of Sales 336,398 533,800 383,010 (574,730 ) 678,478 Gross Profit 157,943 100,541 187,617 (1,068 ) 445,033 Operating Expense: Research and Development Expense 24,455 1,090 5,194 — 30,739 Selling and Administrative Expense 116,528 76,623 161,911 1,254 356,316 Total Operating Expense 140,983 77,713 167,105 1,254 387,055 Profit (Loss) from Operations 16,960 22,828 20,512 (2,322 ) 57,978 Other Income (Expense): Equity in Earnings of Affiliates 27,409 2,249 5,374 (35,032 ) — Interest (Expense) Income, Net (20,466 ) — 196 (37 ) (20,307 ) Intercompany Interest Income (Expense) 14,597 (5,760 ) (8,837 ) — — Net Foreign Currency Transaction Losses (370 ) (21 ) (709 ) — (1,100 ) Other (Expense) Income, Net (2,288 ) (2,434 ) 2,862 1,131 (729 ) Total Other Income (Expense), Net 18,882 (5,966 ) (1,114 ) (33,938 ) (22,136 ) Profit (Loss) Before Income Taxes 35,842 16,862 19,398 (36,260 ) 35,842 Income Tax Expense (Benefit) 2,304 4,022 388 (4,410 ) 2,304 Net Earnings (Loss) Including Noncontrolling Interest 33,538 12,840 19,010 (31,850 ) 33,538 Net Earnings Attributable to Noncontrolling Interest 126 — 126 (126 ) 126 Net Earnings (Loss) Attributable to Tennant Company $ 33,412 $ 12,840 $ 18,884 $ (31,724 ) $ 33,412 Condensed Consolidated Statement of Earnings For the year ended December 31, 2017 (in thousands) Parent Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Total Tennant Company Net Sales $ 454,703 $ 594,405 $ 471,559 $ (517,601 ) $ 1,003,066 Cost of Sales 311,897 488,972 321,759 (519,375 ) 603,253 Gross Profit 142,806 105,433 149,800 1,774 399,813 Operating Expense: Research and Development Expense 27,219 315 4,479 — 32,013 Selling and Administrative Expense 110,414 78,516 145,852 — 334,782 Total Operating Expense 137,633 78,831 150,331 — 366,795 Profit (Loss) from Operations 5,173 26,602 (531 ) 1,774 33,018 Other Income (Expense): Equity in Earnings of Affiliates 12,754 2,004 28,855 (43,613 ) — Interest Expense, Net (22,659 ) — (299 ) (31 ) (22,989 ) Intercompany Interest Income (Expense) 12,519 (5,776 ) (6,743 ) — — Net Foreign Currency Transaction Gains (Losses) 857 — (4,244 ) — (3,387 ) Other (Expense) Income, Net (9,936 ) (736 ) 2,841 (103 ) (7,934 ) Total Other (Expense) Income, Net (6,465 ) (4,508 ) 20,410 (43,747 ) (34,310 ) (Loss) Profit Before Income Taxes (1,292 ) 22,094 19,879 (41,973 ) (1,292 ) Income Tax Expense (Benefit) 4,913 8,070 (98 ) (7,972 ) 4,913 Net (Loss) Earnings Including Noncontrolling Interest $ (6,205 ) $ 14,024 $ 19,977 $ (34,001 ) $ (6,205 ) Net Loss Attributable to Noncontrolling Interest $ (10 ) $ — $ (10 ) $ 10 $ (10 ) Net (Loss) Earnings Attributable to Tennant Company $ (6,195 ) $ 14,024 $ 19,987 $ (34,011 ) $ (6,195 ) Condensed Consolidated Statement of Earnings For the year ended December 31, 2016 (in thousands) Parent Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Total Tennant Company Net Sales $ 455,375 $ 587,815 $ 290,349 $ (524,967 ) $ 808,572 Cost of Sales 299,459 483,075 199,336 (524,893 ) 456,977 Gross Profit 155,916 104,740 91,013 (74 ) 351,595 Operating Expense: Research and Development Expense 32,378 429 1,931 — 34,738 Selling and Administrative Expense 95,340 74,643 78,609 — 248,592 Total Operating Expense 127,718 75,072 80,540 — 283,330 Profit from Operations 28,198 29,668 10,473 (74 ) 68,265 Other Income (Expense): Equity in Earnings of Affiliates 34,068 2,192 — (36,260 ) — Interest (Expense) Income, Net (1,204 ) — 255 — (949 ) Intercompany Interest Income (Expense) 7,157 (5,570 ) (1,587 ) — — Net Foreign Currency Transaction Gains (Losses) 648 (652 ) (388 ) — (392 ) Other (Expense) Income, Net (2,376 ) (573 ) 2,516 — (433 ) Total Other Income (Expense), Net 38,293 (4,603 ) 796 (36,260 ) (1,774 ) Profit Before Income Taxes 66,491 25,065 11,269 (36,334 ) 66,491 Income Tax Expense 19,877 9,443 2,427 (11,870 ) 19,877 Net Earnings (Loss) Attributable to Tennant Company $ 46,614 $ 15,622 $ 8,842 $ (24,464 ) $ 46,614
Condensed Statement of Comprehensive Income	Condensed Consolidated Statement of Comprehensive Income For the year ended December 31, 2018 (in thousands) Parent Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Total Tennant Company Net Earnings (Loss) Including Noncontrolling Interest $ 33,538 $ 12,840 $ 19,010 $ (31,850 ) $ 33,538 Other Comprehensive Income (Loss): Foreign currency translation adjustments (16,221 ) (961 ) (21,422 ) 22,383 (16,221 ) Pension and retiree medical benefits 1,745 — 1,197 (1,197 ) 1,745 Cash flow hedge 1,341 — — — 1,341 Income Taxes: Foreign currency translation adjustments 168 — 168 (168 ) 168 Pension and retiree medical benefits (467 ) — (205 ) 205 (467 ) Cash flow hedge (1,437 ) — — — (1,437 ) Total Other Comprehensive (Loss) Income, net of tax (14,871 ) (961 ) (20,262 ) 21,223 (14,871 ) Total Comprehensive Income (Loss) Including Noncontrolling Interest 18,667 11,879 (1,252 ) (10,627 ) 18,667 Comprehensive Income Attributable to Noncontrolling Interest 126 — 126 (126 ) 126 Comprehensive Income (Loss) Attributable to Tennant Company $ 18,541 $ 11,879 $ (1,378 ) $ (10,501 ) $ 18,541 Condensed Consolidated Statement of Comprehensive Income For the year ended December 31, 2017 (in thousands) Parent Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Total Tennant Company Net (Loss) Earnings $ (6,205 ) $ 14,024 $ 19,977 $ (34,001 ) $ (6,205 ) Other Comprehensive Income (Loss): Foreign currency translation adjustments 28,356 1,215 2,960 (4,175 ) 28,356 Pension and retiree medical benefits 5,868 — 538 (538 ) 5,868 Cash flow hedge (7,731 ) — — — (7,731 ) Income Taxes: Foreign currency translation adjustments 310 — 310 (310 ) 310 Pension and retiree medical benefits (2,087 ) — (99 ) 99 (2,087 ) Cash flow hedge 2,884 — — — 2,884 Total Other Comprehensive Income (Loss), net of tax 27,600 1,215 3,709 (4,924 ) 27,600 Total Comprehensive Income Including Noncontrolling Interest 21,395 15,239 23,686 (38,925 ) 21,395 Comprehensive Loss Attributable to Noncontrolling Interest (10 ) — (10 ) 10 (10 ) Comprehensive Income $ 21,405 $ 15,239 $ 23,696 $ (38,935 ) $ 21,405 Condensed Consolidated Statement of Comprehensive Income For the year ended December 31, 2016 (in thousands) Parent Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Total Tennant Company Net Earnings $ 46,614 $ 15,622 $ 8,842 $ (24,464 ) $ 46,614 Other Comprehensive (Loss) Income: Foreign currency translation adjustments 109 270 3,534 (3,804 ) 109 Pension and retiree medical benefits (2,248 ) — (1,691 ) 1,691 (2,248 ) Cash flow hedge (305 ) — — — (305 ) Income Taxes: Foreign currency translation adjustments 32 — 32 (32 ) 32 Pension and retiree medical benefits 504 — 296 (296 ) 504 Cash flow hedge 114 — — — 114 Total Other Comprehensive (Loss) Earnings, net of tax (1,794 ) 270 2,171 (2,441 ) (1,794 ) Comprehensive Income (Loss) $ 44,820 $ 15,892 $ 11,013 $ (26,905 ) $ 44,820
Condensed Balance Sheet	Condensed Consolidated Balance Sheet As of December 31, 2018 (in thousands) Parent Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Total Tennant Company ASSETS Current Assets: Cash and Cash Equivalents $ 24,779 $ 1,610 $ 59,220 $ — $ 85,609 Restricted Cash — — 525 — 525 Net Receivables 866 94,763 120,541 — 216,170 Intercompany Receivables 29,976 148,961 — (178,937 ) — Inventories 37,154 13,381 94,680 (10,082 ) 135,133 Prepaid Expenses 12,565 782 9,282 (488 ) 22,141 Other Current Assets 4,935 396 3,735 — 9,066 Total Current Assets 110,275 259,893 287,983 (189,507 ) 468,644 Property, Plant and Equipment 229,826 12,677 144,138 — 386,641 Accumulated Depreciation (159,344 ) (6,913 ) (56,937 ) — (223,194 ) Property, Plant and Equipment, Net 70,482 5,764 87,201 — 163,447 Deferred Income Taxes 4,035 3,072 8,382 — 15,489 Investment in Affiliates 420,897 12,142 20,768 (453,807 ) — Intercompany Loans 301,555 — 3,205 (304,760 ) — Goodwill 12,870 1,726 168,075 — 182,671 Intangible Assets, Net 4,012 2,684 139,850 — 146,546 Other Assets 6,987 (2 ) 8,762 — 15,747 Total Assets $ 931,113 $ 285,279 $ 724,226 $ (948,074 ) $ 992,544 LIABILITIES AND TOTAL EQUITY Current Liabilities: Current Portion of Long-Term Debt $ 21,816 $ — $ 5,189 $ — $ 27,005 Accounts Payable 40,991 4,982 52,425 — 98,398 Intercompany Payables 149,460 — 29,477 (178,937 ) — Employee Compensation and Benefits 13,947 16,890 18,616 — 49,453 Income Taxes Payable 806 — 1,984 (667 ) 2,123 Other Current Liabilities 22,387 17,939 31,390 179 71,895 Total Current Liabilities 249,407 39,811 139,081 (179,425 ) 248,874 Long-Term Liabilities: Long-Term Debt 326,460 — 1,600 — 328,060 Intercompany Loans 3,205 128,000 173,555 (304,760 ) — Employee-Related Benefits 11,041 2,015 8,054 — 21,110 Deferred Income Taxes — — 46,018 — 46,018 Other Liabilities 24,648 2,899 4,583 — 32,130 Total Long-Term Liabilities 365,354 132,914 233,810 (304,760 ) 427,318 Total Liabilities 614,761 172,725 372,891 (484,185 ) 676,192 Equity: Common Stock 6,797 — 11,131 (11,131 ) 6,797 Additional Paid-In Capital 28,550 77,551 399,459 (477,010 ) 28,550 Retained Earnings 316,269 36,633 (2,532 ) (34,101 ) 316,269 Accumulated Other Comprehensive Loss (37,194 ) (1,630 ) (58,653 ) 60,283 (37,194 ) Total Tennant Company Shareholders’ Equity 314,422 112,554 349,405 (461,959 ) 314,422 Noncontrolling Interest 1,930 — 1,930 (1,930 ) 1,930 Total Equity 316,352 112,554 351,335 (463,889 ) 316,352 Total Liabilities and Total Equity $ 931,113 $ 285,279 $ 724,226 $ (948,074 ) $ 992,544 Condensed Consolidated Balance Sheet As of December 31, 2017 (in thousands) Parent Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Total Tennant Company ASSETS Current Assets: Cash and Cash Equivalents $ 18,469 $ 507 $ 39,422 $ — $ 58,398 Restricted Cash — — 653 — 653 Net Receivables 683 88,629 120,204 — 209,516 Intercompany Receivables 53,444 133,778 — (187,222 ) — Inventories 29,450 12,695 94,542 (8,993 ) 127,694 Prepaid Expenses 8,774 1,172 9,405 — 19,351 Other Current Assets 4,030 — 3,473 — 7,503 Total Current Assets 114,850 236,781 267,699 (196,215 ) 423,115 Property, Plant and Equipment 225,064 12,155 145,549 — 382,768 Accumulated Depreciation (146,320 ) (6,333 ) (50,097 ) — (202,750 ) Property, Plant and Equipment, Net 78,744 5,822 95,452 — 180,018 Deferred Income Taxes 1,308 2,669 7,157 — 11,134 Investment in Affiliates 392,486 11,273 20,811 (424,570 ) — Intercompany Loans 304,822 — 4,983 (309,805 ) — Goodwill 12,869 1,739 171,436 — 186,044 Intangible Assets, Net 2,105 2,898 167,344 — 172,347 Other Assets 10,363 — 10,956 — 21,319 Total Assets $ 917,547 $ 261,182 $ 745,838 $ (930,590 ) $ 993,977 LIABILITIES AND SHAREHOLDERS' EQUITY Current Liabilities: Current Portion of Long-Term Debt $ 29,413 $ — $ 1,470 $ — $ 30,883 Accounts Payable 39,927 3,018 53,137 — 96,082 Intercompany Payables 133,778 1,963 51,481 (187,222 ) — Employee Compensation and Benefits 8,311 10,355 18,591 — 37,257 Income Taxes Payable 366 — 2,472 — 2,838 Other Current Liabilities 20,183 15,760 33,504 — 69,447 Total Current Liabilities 231,978 31,096 160,655 (187,222 ) 236,507 Long-Term Liabilities: Long-Term Debt 344,147 — 1,809 — 345,956 Intercompany Loans — 128,000 181,805 (309,805 ) — Employee-Related Benefits 11,160 3,992 8,715 — 23,867 Deferred Income Taxes — — 53,225 — 53,225 Other Liabilities 31,788 2,483 1,677 — 35,948 Total Long-Term Liabilities 387,095 134,475 247,231 (309,805 ) 458,996 Total Liabilities 619,073 165,571 407,886 (497,027 ) 695,503 Shareholders' Equity: Common Stock 6,705 — 11,131 (11,131 ) 6,705 Additional Paid-In Capital 15,089 72,483 384,460 (456,943 ) 15,089 Retained Earnings 297,032 23,797 (21,219 ) (2,578 ) 297,032 Accumulated Other Comprehensive Loss (22,323 ) (669 ) (38,391 ) 39,060 (22,323 ) Total Tennant Company Shareholders’ Equity 296,503 95,611 335,981 (431,592 ) 296,503 Noncontrolling Interest 1,971 — 1,971 (1,971 ) 1,971 Total Equity 298,474 95,611 337,952 (433,563 ) 298,474 Total Liabilities and Total Equity $ 917,547 $ 261,182 $ 745,838 $ (930,590 ) $ 993,977
Condensed Cash Flow Statement	Condensed Consolidated Statement of Cash Flows For the year ended December 31, 2018 (in thousands) Parent Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Total Tennant Company OPERATING ACTIVITIES Net Cash Provided by Operating Activities $ 68,082 $ 1,202 $ 10,888 $ (202 ) $ 79,970 INVESTING ACTIVITIES Purchases of Property, Plant and Equipment (6,832 ) (99 ) (11,849 ) — (18,780 ) Proceeds from Disposals of Property, Plant and Equipment 21 — 91 — 112 Proceeds from Principal Payments Received on Long-Term Note Receivable — — 1,416 — 1,416 Proceeds from Sale of Business — — 4,000 — 4,000 Purchases of Intangible Asset (2,500 ) — (275 ) — (2,775 ) Change in Investments in Subsidiaries (15,622 ) — — 15,622 — Loan Payments Received by Parent from Subsidiary 1,218 — — (1,218 ) — Loan Payments Received by Subsidiary from Parent — — 1,778 (1,778 ) — Net Cash Used in Investing Activities (23,715 ) (99 ) (4,839 ) 12,626 (16,027 ) FINANCING ACTIVITIES Proceeds from Short-Term Debt — — 3,926 — 3,926 Loan Repayments made to Parent from Subsidiary — — (1,218 ) 1,218 — Loan Repayments made to Subsidiary from Parent (1,778 ) — — 1,778 — Change in Subsidiary Equity — — 15,622 (15,622 ) — Proceeds from Issuance of Long-Term Debt 11,000 — — — 11,000 Payments of Long-Term Debt (38,000 ) — (255 ) — (38,255 ) Change in Capital Lease Obligations — — 14 — 14 Proceeds from Issuances of Common Stock 5,880 — — — 5,880 Dividends Paid (15,343 ) — (202 ) 202 (15,343 ) Net Cash (Used in) Provided by Financing Activities (38,241 ) — 17,887 (12,424 ) (32,778 ) Effect of Exchange Rate Changes on Cash, Cash Equivalents and Restricted Cash 184 — (4,266 ) — (4,082 ) NET INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH 6,310 1,103 19,670 — 27,083 Cash, Cash Equivalents and Restricted Cash at Beginning of Year 18,469 507 40,075 — 59,051 CASH, CASH EQUIVALENTS AND RESTRICTED CASH AT END OF YEAR $ 24,779 $ 1,610 $ 59,745 $ — $ 86,134 Condensed Consolidated Statement of Cash Flows For the year ended December 31, 2017 (in thousands) Parent Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Total Tennant Company OPERATING ACTIVITIES Net Cash Provided by Operating Activities $ 26,992 $ 280 $ 27,711 $ (809 ) $ 54,174 INVESTING ACTIVITIES Purchases of Property, Plant and Equipment (9,558 ) — (10,879 ) — (20,437 ) Proceeds from Disposals of Property, Plant and Equipment 23 1 2,487 — 2,511 Proceeds from Principal Payments received on Long-Term Note Receivable — — 667 — 667 Acquisition of Businesses, Net of Cash Acquired (304 ) — (353,769 ) — (354,073 ) Issuance of Long-Term Note Receivable — — (1,500 ) — (1,500 ) Purchase of Intangible Asset (2,500 ) — — — (2,500 ) Change in Investments in Subsidiaries (199,028 ) — — 199,028 — Loan Borrowings (Payments) from Subsidiaries (159,780 ) — (4,983 ) 164,763 — Net Cash (Used in) Provided by Investing Activities (371,147 ) 1 (367,977 ) 363,791 (375,332 ) FINANCING ACTIVITIES Proceeds from Short-Term Debt 303,000 — — — 303,000 Repayments of Short-Term Debt (303,000 ) — — — (303,000 ) Loan Borrowings (Payments) from Parent 4,983 — 159,780 (164,763 ) — Change in Subsidiary Equity — — 199,028 (199,028 ) — Payments of Long-Term Debt (96,142 ) — (106 ) — (96,248 ) Proceeds from Issuance of Long-Term Debt 440,000 — — — 440,000 Payments of Debt Issuance Costs (16,482 ) — — — (16,482 ) Change in Capital Lease Obligations — — 311 — 311 Proceeds from Issuances of Common Stock 6,875 — — — 6,875 Purchase of Noncontrolling Owner Interest — — (30 ) — (30 ) Dividends Paid (14,953 ) — (809 ) 809 (14,953 ) Net Cash Provided by Financing Activities 324,281 — 358,174 (362,982 ) 319,473 Effect of Exchange Rate Changes on Cash and Cash Equivalents (141 ) — 2,327 — 2,186 NET (DECREASE) INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH (20,015 ) 281 20,235 — 501 Cash, Cash Equivalents and Restricted Cash at Beginning of Year 38,484 226 19,840 — 58,550 CASH, CASH EQUIVALENTS AND RESTRICTED CASH AT END OF YEAR $ 18,469 $ 507 $ 40,075 $ — $ 59,051 Condensed Consolidated Statement of Cash Flows For the year ended December 31, 2016 (in thousands) Parent Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Total Tennant Company OPERATING ACTIVITIES Net Cash Provided by Operating Activities $ 44,147 $ 239 $ 14,090 $ (598 ) $ 57,878 INVESTING ACTIVITIES Purchases of Property, Plant and Equipment (21,507 ) (13 ) (5,006 ) — (26,526 ) Proceeds from Disposals of Property, Plant and Equipment 377 — 238 — 615 Acquisition of Businesses, Net of Cash Acquired — (11,539 ) (1,394 ) — (12,933 ) Issuance of Long-Term Note Receivable — — (2,000 ) — (2,000 ) Loan Borrowings (Payments) from Subsidiaries 8,690 — — (8,690 ) — Proceeds from Sale of Business — — 285 — 285 Change in Investments in Subsidiaries (19,594 ) — — 19,594 — Net Cash Used in Investing Activities (32,034 ) (11,552 ) (7,877 ) 10,904 (40,559 ) FINANCING ACTIVITIES Loan (Payments) Borrowings from Parent — 7,969 (16,659 ) 8,690 — Change in Subsidiary Entity — 3,570 16,024 (19,594 ) — Payments of Long-Term Debt (3,429 ) — (31 ) — (3,460 ) Proceeds from Issuance of Long-Term Debt 15,000 — — — 15,000 Purchases of Common Stock (12,762 ) — — — (12,762 ) Proceeds from Issuances of Common Stock 5,271 — — — 5,271 Excess Tax Benefit on Stock Plans 686 — — — 686 Dividends Paid (14,293 ) — (598 ) 598 (14,293 ) Net Cash (Used in) Provided by Financing Activities (9,527 ) 11,539 (1,264 ) (10,306 ) (9,558 ) Effect of Exchange Rate Changes on Cash and Cash Equivalents 63 — (1,213 ) — (1,150 ) NET INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH 2,649 226 3,736 — 6,611 Cash, Cash Equivalents and Restricted Cash at Beginning of Year 35,835 — 16,104 — 51,939 CASH, CASH EQUIVALENTS AND RESTRICTED CASH AT END OF YEAR $ 38,484 $ 226 $ 19,840 $ — $ 58,550

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Summary of Significant Accounting Policies [Abstract]
Accumulated Other Comprehensive Loss, Foreign Currency Translation Adjustment, Net of Tax	$ 31,831	$ 15,778	$ 44,444
Restricted Cash	$ 525	653
Number of shares authorized to be repurchased under our stock repurchase programs	1,392,892
Machine warranty, range minimum (in years)	1 year
Machine warranty, range maximum (in years)	4 years
Advertising Costs	$ 8,767	$ 8,228	$ 7,269
Buildings and improvements
Property, Plant and Equipment
Property, Plant and Equipment, Useful life, Average	30 years
Property, Plant and Equipment, Other Types | Minimum
Property, Plant and Equipment
Property, Plant and Equipment, Useful life, Average	3 years
Property, Plant and Equipment, Other Types | Maximum
Property, Plant and Equipment
Property, Plant and Equipment, Useful life, Average	15 years

Newly Adopted Accounting Pron_3

Newly Adopted Accounting Pronouncements (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Assets [Abstract]
Total Current Assets	$ 468,644	$ 423,115
Total Assets	992,544	993,977
Liabilities [Abstract]
Other Current Liabilities	71,895	69,447
Total Current Liabilities	248,874	236,507
Total Liabilities	676,192	$ 695,503
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Assets [Abstract]
Net Receivables	1,312
Total Current Assets	1,312
Total Assets	1,312
Liabilities [Abstract]
Other Current Liabilities	1,312
Total Current Liabilities	1,312
Total Liabilities	1,312
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Assets [Abstract]
Net Receivables	214,858
Total Current Assets	467,332
Total Assets	991,232
Liabilities [Abstract]
Other Current Liabilities	70,583
Total Current Liabilities	247,562
Total Liabilities	$ 674,880

Newly Adopted Accounting Pron_4

Newly Adopted Accounting Pronouncements (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2018
Selling and Administrative Expenses | Scenario, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net benefit cost (credit)	$ 5,974	$ 233
Other Expense, Net | Scenario, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net benefit cost (credit)	$ 5,974	$ 233
Accounting Standards Update 2016-16
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets			$ 94
ASU 2016-16, Increase (Decrease) in long-term deferred charge			1,281
Deferred Tax Asset, Intra-entity Transfer, Asset Other than Inventory			1,187
Accounting Standards Update 2018-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets			$ 1,262

Revision of Prior Period Fina_2

Revision of Prior Period Financial Statements Accounting Changes and Error Corrections (Details)	12 Months Ended
	Dec. 31, 2017
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Accounting Changes and Error Corrections [Text Block]	3. Revision of Prior Period Financial Statements Subsequent to the issuance of our consolidated financial statements for the quarter and year-to-date periods ended September 30, 2018, management identified misclassifications between Cost of Sales and Selling and Administrative Expense in our Consolidated Statements of Operations. As a result of revising prior period financial statement amounts for these misclassifications, Cost of Sales increased $4,608 and Selling and Administrative Expense decreased $4,608 for the year ended December 31, 2017. There were no misclassifications identified for the year ended December 31, 2016. These revisions had no impact on Profit (Loss) Before Income Taxes. The revisions also had no impact on our Consolidated Statements of Comprehensive Income, Consolidated Statements of Equity, Consolidated Balance Sheets, or Consolidated Statements of Cash Flow. Management evaluated the materiality of the revisions from a quantitative and qualitative perspective and concluded that the revisions are immaterial to our consolidated financial statements. Revisions to amounts in previously filed quarterly financial statements from 2018 and 2017 are reflected in Note 22.
Cost of Sales [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Reclassifications [Text Block]	4,608
Selling and Administrative Expenses
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Accounting Changes and Error Corrections [Text Block]	4,608

Revenue from Contracts with C_3

Revenue from Contracts with Customers (Details 1) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disaggregation of Revenue [Line Items]
Net Sales	$ 285,212	$ 273,255	$ 292,197	$ 272,847	$ 279,295	$ 261,921	$ 270,791	$ 191,059	$ 1,123,511	$ 1,003,066	$ 808,572
Sales Direct to Consumer
Disaggregation of Revenue [Line Items]
Net Sales									735,244	674,495	609,538
Sales to Distributors
Disaggregation of Revenue [Line Items]
Net Sales									388,267	328,571	199,034
Equipment
Disaggregation of Revenue [Line Items]
Net Sales									729,993	636,875	491,075
Parts and Consumables
Disaggregation of Revenue [Line Items]
Net Sales									222,345	202,452	173,632
Specialty Surface Coatings
Disaggregation of Revenue [Line Items]
Net Sales									29,827	31,407	29,146
Services and Other
Disaggregation of Revenue [Line Items]
Net Sales									141,346	132,332	114,719
Americas
Disaggregation of Revenue [Line Items]
Net Sales									690,996	640,274	607,026
Europe, Middle East and Africa
Disaggregation of Revenue [Line Items]
Net Sales									335,603	273,738	129,046
Asia Pacific
Disaggregation of Revenue [Line Items]
Net Sales									$ 96,912	$ 89,054	$ 72,500

Revenue from Contracts with C_4

Revenue from Contracts with Customers (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Contract with Customer, Contract Liability [Roll Forward] [Roll Forward]
Beginning balance		$ 13,466
Additions to sales incentive accrual	$ 30,458
Contract payments	(26,992)
Foreign currency fluctuations	(280)
Ending balance	$ 16,652

Revenue from Contracts with C_5

Revenue from Contracts with Customers (Details 3) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Deferred Revenue, Current		$ 5,021	$ 5,815
Deferred Revenue, Noncurrent		3,504	2,483
Movement in Deferred Revenue [Roll Forward]
Beginning balance	$ 7,787
Increase in deferred revenue representing our obligation to satisfy future performance obligations	14,650
Decrease in deferred revenue for amounts recognized in Net Sales for satisfied performance obligations	(13,755)
Foreign currency fluctuations	(157)
Ending balance	8,525
Revenue, Performance Obligation Satisfied over Time [Abstract]
2,019		5,021
2,020		1,865
2,021		1,044
2,022		442
2,023		153
Thereafter		0
Total	$ 7,787	$ 8,525	$ 7,787
Prepaid Maintenance Contract Duration, Minimum
Disaggregation of Revenue [Line Items]
Standard Prepaid Maintenance Contract Time Period	12 months
Prepaid Maintenance Contract Duration, Maximum
Disaggregation of Revenue [Line Items]
Standard Prepaid Maintenance Contract Time Period	60 months

Investment in Joint Venture (De

Investment in Joint Venture (Details) $ in Thousands	Dec. 31, 2018USD ($)
Related Party Transactions [Abstract]
Ownership interest (as a percent)	50.00%
Investment in joint venture	$ 32
Note receivable from joint venture	$ 1,500

Management Actions (Details)

Management Actions (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]
Approximate time anticipated savings will offset the restructuring charge		1 year
Restructuring Reserve [Roll Forward]
Restructuring Charges, net of noncash expenses			$ 9,558
Cash Payments		$ (2,123)	(6,312)
Foreign currency adjustments		97	(190)
Restructuring Reserve ending balance		2,248	3,436
Selling and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 8,018	1,032	2,501
Restructuring Costs and Asset Impairment Charges	961
Restructuring Reserve [Roll Forward]
Restructuring Charges	$ 8,018	$ 1,032	$ 2,501

Acquisitions (Details 1)

Acquisitions (Details 1) - USD ($)	Apr. 06, 2017	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Proceeds from Sale of Business										$ 4,000,000	$ 4,000,000	$ 0	$ 285,000
Gain (Loss) on Disposition of Business										$ 1,000,000
Goodwill		$ 182,671,000				$ 186,044,000					182,671,000	186,044,000	21,065,000
Amortization expense											22,129,000	17,054,000	409,000
Net Sales		285,212,000	$ 273,255,000	$ 292,197,000	$ 272,847,000	279,295,000	$ 261,921,000	$ 270,791,000	$ 191,059,000		1,123,511,000	1,003,066,000	808,572,000
Net Earnings		7,717,000	$ 9,676,000	$ 12,744,000	$ 3,274,000	$ (3,206,000)	$ 3,559,000	$ (2,591,000)	$ (3,957,000)		33,412,000	$ (6,195,000)	$ 46,614,000
Senior Secured Credit Facility
Business Acquisition [Line Items]
Long-term Line of Credit, Noncurrent	$ 420,000,000
IP Cleaning S.p.A
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired	100.00%
Business Combination, Consideration Transferred	$ 353,769,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents	8,804,000	159,445,000									159,445,000
Goodwill	152,472,000
Business Acquisition, Goodwill, Expected Tax Deductible Amount	$ 0
Intangible Assets Subject to Amortization:		$ 4,627,000									$ 4,627,000
Weighted-average original life (in years)	10 years										15 years
Amortization expense											$ 20,794,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	$ 118,271,000
Customer Lists
Business Acquisition [Line Items]
Weighted-average original life (in years)											15 years	15 years
Customer Lists | IP Cleaning S.p.A
Business Acquisition [Line Items]
Intangible Assets Subject to Amortization:	123,061,000
Trade Name
Business Acquisition [Line Items]
Weighted-average original life (in years)											10 years	10 years
Trade Name | IP Cleaning S.p.A
Business Acquisition [Line Items]
Intangible Assets Subject to Amortization:	26,753,000
Technology
Business Acquisition [Line Items]
Weighted-average original life (in years)											10 years	11 years
Technology | IP Cleaning S.p.A
Business Acquisition [Line Items]
Intangible Assets Subject to Amortization:	$ 9,631,000

Acquisitions (Details 2)

Acquisitions (Details 2) - USD ($)	Dec. 31, 2018	Dec. 31, 2017	Apr. 06, 2017	Dec. 31, 2016
LIABILITIES
Goodwill	$ 182,671,000	$ 186,044,000		$ 21,065,000
IP Cleaning S.p.A
ASSETS
Receivables			$ 39,984,000
Inventories			46,442,000
Other Current Assets			7,456,000
Assets Held for Sale			2,247,000
Property, Plant and Equipment			63,890,000
Intangible Assets Subject to Amortization:	$ 4,627,000
Other Assets			2,000,000
Total Identifiable Assets Acquired			321,464,000
LIABILITIES
Accounts Payable			32,227,000
Accrued Expenses			18,130,000
Deferred Income Taxes			56,950,000
Other Liabilities			10,964,000
Total Identifiable Liabilities Assumed			118,271,000
Net Identifiable Assets Acquired			203,193,000
Noncontrolling Interest			(1,896,000)
Goodwill			152,472,000
Total Estimated Purchase Price, net of Cash Acquired			353,769,000
Trade Name | IP Cleaning S.p.A
ASSETS
Intangible Assets Subject to Amortization:			26,753,000
Customer Lists | IP Cleaning S.p.A
ASSETS
Intangible Assets Subject to Amortization:			123,061,000
Technology | IP Cleaning S.p.A
ASSETS
Intangible Assets Subject to Amortization:			$ 9,631,000

Acquisitions (Details 3)

Acquisitions (Details 3) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net Sales
Net Sales	$ 285,212	$ 273,255	$ 292,197	$ 272,847	$ 279,295	$ 261,921	$ 270,791	$ 191,059	$ 1,123,511	$ 1,003,066	$ 808,572
Net Earnings (Loss) Attributable to Tennant Company
As reported	$ 7,717	$ 9,676	$ 12,744	$ 3,274	$ (3,206)	$ 3,559	$ (2,591)	$ (3,957)	$ 33,412	$ (6,195)	$ 46,614
Net Earnings (Loss) Attributable to Tennant Company per Diluted Share
As reported (in dollars per share)	$ 0.42	$ 0.52	$ 0.69	$ 0.18	$ (0.18)	$ 0.20	$ (0.15)	$ (0.22)	$ 1.82	$ (0.35)	$ 2.59
IP Cleaning S.p.A
Net Sales
Pro forma										$ 1,057,127	$ 1,013,710
Net Earnings (Loss) Attributable to Tennant Company
Pro forma										$ 12,288	$ 30,412
Net Earnings (Loss) Attributable to Tennant Company per Diluted Share
Pro forma (in dollars per share)										$ 0.68	$ 1.69

Acquisitions (Details 4)

Acquisitions (Details 4) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Goodwill	$ 182,671	$ 186,044	$ 21,065

Inventories (Details)

Inventories (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Inventories carried at LIFO:
Finished goods	$ 48,607	$ 43,439
Raw materials, production parts and work-in-process	28,581	23,694
LIFO Reserve	(31,199)	(28,429)
Total LIFO inventories	45,989	38,704
Inventories carried at FIFO:
Finished goods	53,520	54,161
Raw materials, production parts and work-in-process	35,624	34,829
Total FIFO inventories	89,144	88,990
Inventories	$ 135,133	$ 127,694

Property, Plant and Equipment_2

Property, Plant and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment
Property, Plant and Equipment	$ (386,641)	$ (382,768)
Accumulated Depreciation, Property, Plant and Equipment prior to Assets Held for Sale	223,194	202,750
Property, Plant and Equipment, Net	163,447	180,018
Depreciation expense	32,291	26,199	$ 17,891
Land
Property, Plant and Equipment
Property, Plant and Equipment	(17,857)	(18,152)
Buildings and improvements
Property, Plant and Equipment
Property, Plant and Equipment	(93,729)	(96,230)
Machinery and manufacturing equipment
Property, Plant and Equipment
Property, Plant and Equipment	(154,118)	(151,645)
Office equipment
Property, Plant and Equipment
Property, Plant and Equipment	(111,219)	(107,312)
Work in progress
Property, Plant and Equipment
Property, Plant and Equipment	$ (9,718)	$ (9,429)

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Acquired Finite-Lived Intangible Assets
Payments to Acquire Intangible Assets	$ 2,775	$ 2,500	$ 0
Goodwill, Gross
Balance, beginning of period	227,224	58,397
Additions	0	147,845
Purchase accounting adjustments	4,627	(1,865)
Foreign currency fluctuations	(10,141)	22,847
Balance, end of period	221,710	227,224	58,397
Accumulated Impairment Losses
Balance, beginning of period	(41,180)	(37,332)
Foreign currency fluctuations	(2,142)	(3,848)
Balance, end of period	(39,038)	(41,180)	(37,332)
Goodwill, Net
Balance, beginning of period	186,044	21,065
Additions	0	147,845
Purchase accounting adjustments	4,627	(1,865)
Foreign currency fluctuations	(8,000)	18,999
Balance, end of period	182,671	186,044	21,065
Acquired Finite-lived Intangible Assets
Original cost	191,087	195,912
Accumulated amortization	(44,541)	(23,565)
Intangible Assets, Net	146,546	172,347
Amortization of Intangible Assets	22,129	17,054	$ 409
Estimated aggregate amortization expense of Intangible Assets
2,019	21,297
2,020	19,873
2,021	18,092
2,022	15,913
2,023	14,352
Thereafter	57,019
Total	146,546
Customer Lists
Acquired Finite-lived Intangible Assets
Original cost	143,059	149,355
Accumulated amortization	(33,714)	(17,870)
Intangible Assets, Net	$ 109,345	$ 131,485
Weighted-average original life (in years)	15 years	15 years
Trade Name
Acquired Finite-lived Intangible Assets
Original cost	$ 30,592	$ 31,968
Accumulated amortization	(5,327)	(2,436)
Intangible Assets, Net	$ 25,265	$ 29,532
Weighted-average original life (in years)	10 years	10 years
Technology
Acquired Finite-Lived Intangible Assets
Payments to Acquire Intangible Assets	$ 2,775
Acquired Finite-lived Intangible Assets
Original cost	17,436	$ 14,589
Accumulated amortization	(5,500)	(3,259)
Intangible Assets, Net	$ 11,936	$ 11,330
Weighted-average original life (in years)	10 years	11 years

Debt Narrative (Details)

Debt Narrative (Details)	12 Months Ended
	Dec. 31, 2018USD ($)	Sep. 30, 2018	Apr. 18, 2017USD ($)
Line of Credit Facility
Weighted average interest rate at end of period	5.36%
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	$ 12,066,000
Letters of Credit Outstanding, Amount	3,279,000
Commitment fees on unused lines of credit	$ 595,000
Debt, Weighted Average Interest Rate, net of Currency Swap Contract	4.46%
Line of Credit
Line of Credit Facility
Outstanding Borrowings	$ 22,000,000
Line of Credit | JPMorgan, 2017 Credit Agreement
Line of Credit Facility
Face amount			$ 300,000,000
Debt Instrument, Notes Repurchase Price As Percentage Of Principal Amount In Changes Of Control	101.00%
Debt Instrument, Notes Repurchase Price As Percentage Of Principal Amount When Not Use Asset Sales Proceeds For Specific Purposes	100.00%
Revolving Credit Facility
Line of Credit Facility
Outstanding Borrowings	$ 31,000,000
Line of Credit Facility, Remaining Borrowing Capacity	165,721,000
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	6,875,000
Long-term Debt, Additional Repayments of Principal in Next Twelve Months	15,125,000
Long-term Debt, Current Maturities	$ 22,000,000
Revolving Credit Facility | JPMorgan, 2017 Credit Agreement
Line of Credit Facility
Debt Instrument, Covenant, Indebtedness to Adjusted EBITDA Ratio, Maximum		4
Debt Instrument, Covenant, Adjusted EBITDA to Interest Expense Ratio, Maximum		3.50
Debt Instrument, Covenant, Senior Secured Net Indebtedness to Adjusted EBITDA Ratio, Maximum		3.50
Debt Instrument, Covenant, Net Leverage Ratio, Minimum		3
Bonds
Line of Credit Facility
Face amount			$ 300,000,000
Interest rate, Stated percentage	5.625%		5.625%
Minimum | Revolving Credit Facility | JPMorgan, 2017 Credit Agreement
Line of Credit Facility
Debt Instrument, Covenant, Repayment of Debt, Percentage of Excess Cash Flow		25.00%
Maximum | Revolving Credit Facility | JPMorgan, 2017 Credit Agreement
Line of Credit Facility
Debt Instrument, Covenant, Repayment of Debt, Percentage of Excess Cash Flow		50.00%

Debt Schedule of Outstanding De

Debt Schedule of Outstanding Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Notes Payable to Bank	$ 3,926
Current Portion of Long-Term Debt	27,005	$ 30,883
Debt and Capital Lease Obligations	355,065	376,839
Less: Unamortized Debt Issuance Costs	(4,724)	(6,440)
Less: Current Maturities of Capital Lease Obligations	(1,262)
Long-Term Debt	328,060	345,956
Bonds
Debt Instrument [Line Items]
Debt and Capital Lease Obligations	300,000	300,000
Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Debt and Capital Lease Obligations	2,863	3,279
Line of Credit [Member]
Debt Instrument [Line Items]
Current Portion of Long-Term Debt	25,927
Less: Current Maturities of Credit Facility Borrowings, Net of Debt Issuance Costs	(27,005)	(30,883)
Debt Instrument, Unamortized Debt Issuance Costs, Current Portion, net	184
Revolving Credit Facility
Debt Instrument [Line Items]
Long-term Debt, Additional Repayments of Principal in Next Twelve Months	15,125
Debt Instrument, Unused Borrowing Capacity, Amount	165,721
JPMorgan, 2017 Credit Agreement | Line of Credit [Member]
Debt Instrument [Line Items]
Debt and Capital Lease Obligations	$ 53,000	$ 80,000

Debt Schedule of Debt Maturitie

Debt Schedule of Debt Maturities (Details) $ in Thousands	Dec. 31, 2018USD ($)
Short-term Debt [Line Items]
Capital Lease Obligations, Current	$ 1,262
2,018	12,066
2,019	10,297
2,020	6,255
2,021	31,171
2,022	0
Thereafter	300,000
Total minimum obligations	359,789
Revolving Credit Facility
Short-term Debt [Line Items]
Long-term Debt, Current Maturities	22,000
2,018	$ 6,875

Other Current Liabilities (Deta

Other Current Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other Liabilities, Current [Abstract]
Taxes, other than income taxes	$ 12,763	$ 14,760
Warranty	13,062	12,676
Deferred revenue	5,021	5,815
Rebates	16,652	13,466
Freight	4,475	3,208
Severance and Restructuring	2,248	4,267
Miscellaneous accrued expenses	13,117	10,779
Other	4,557	4,476
Total	71,895	69,447
Changes in warranty reserves
Beginning balance	12,676	10,960	$ 10,093
Product warranty provision	13,172	12,124	12,413
Acquired Warranty Obligations	0	1,208	42
Foreign currency	(172)	274	82
Claims paid	(12,614)	(11,890)	(11,670)
Ending balance	$ 13,062	$ 12,676	$ 10,960

Derivatives (Details 1)

Derivatives (Details 1) $ in Thousands	1 Months Ended	12 Months Ended
	Apr. 30, 2022EUR (€)	Dec. 31, 2018USD ($)	Dec. 31, 2018EUR (€)	Dec. 31, 2018EUR (€)	Dec. 31, 2017USD ($)	Mar. 31, 2017EUR (€)
Derivatives designated as hedging instruments
Derivatives, Fair Value [Line Items]
Derivative, Term of Contract		1 year	1 year
Cash Flow Hedge Losses to be Reclassified within Twelve Months		$ 2,367
Foreign currency option contracts | Derivatives designated as hedging instruments
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount		8,436			$ 8,619
Fair Value Asset Derivatives		245			86
Fair Value Liability Derivatives		0			0
Foreign currency option contracts | Derivatives not designated as hedging instruments
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount | €				€ 0		€ 180,000,000
Foreign currency forward contracts | Derivatives designated as hedging instruments
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount		0			2,928
Fair Value Asset Derivatives		6,987			7,218
Fair Value Liability Derivatives		25,415			34,961
Foreign currency forward contracts | Derivatives not designated as hedging instruments
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount		63,410			60,858
Fair Value Asset Derivatives		223			442
Fair Value Liability Derivatives		$ 0			$ 425
Cross Currency Swap | Derivatives designated as hedging instruments
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount | €				174,000,000
Debt Instrument, Periodic Payment, Interest | €			€ 24,000,000
Cross Currency Swap | Derivatives not designated as hedging instruments
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount | €				€ 0
Scenario, Forecast | Cross Currency Swap | Derivatives designated as hedging instruments
Derivatives, Fair Value [Line Items]
Debt Instrument, Periodic Payment, Principal | €	€ 150,000,000

Derivatives (Details 2)

Derivatives (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Foreign currency option contracts | Derivatives not designated as hedging instruments
Derivative Instruments, (Loss) Gain [Line Items]
Net (loss) gain recognized in earnings	$ 0	$ 0	$ 0
Foreign currency option contracts | Cash Flow Hedging
Derivative Instruments, (Loss) Gain [Line Items]
Net (loss) gain recognized in Other Comprehensive Income (Loss), net of tax	100	(193)	(259)
Net (loss) gain reclassified from Accumulated Other Comprehensive Loss into earnings, net of tax, effective portion to Net Sales	(110)	(178)	(148)
Net gain reclassified from Accumulated Other Comprehensive Loss in earnings, net of tax, effective portion to Interest Income	0	0	0
Net gain (loss) reclassified from Accumulated Other Comprehensive Loss into earnings, net of tax, effective portion to Net Foreign Currency Transaction Losses	0	0	0
Net (loss) gain recognized in earnings	8	(13)	(11)
Foreign currency forward contracts | Derivatives not designated as hedging instruments
Derivative Instruments, (Loss) Gain [Line Items]
Net (loss) gain recognized in earnings	(2,518)	(6,161)	(890)
Foreign currency forward contracts | Cash Flow Hedging
Derivative Instruments, (Loss) Gain [Line Items]
Net (loss) gain recognized in Other Comprehensive Income (Loss), net of tax	9,025	(16,226)	(73)
Net (loss) gain reclassified from Accumulated Other Comprehensive Loss into earnings, net of tax, effective portion to Net Sales	(18)	(37)	7
Net gain reclassified from Accumulated Other Comprehensive Loss in earnings, net of tax, effective portion to Interest Income	1,870	1,198	0
Net gain (loss) reclassified from Accumulated Other Comprehensive Loss into earnings, net of tax, effective portion to Net Foreign Currency Transaction Losses	6,353	(12,555)	0
Net (loss) gain recognized in earnings	$ 12	$ 10	$ 2

Derivatives Derivatives not des

Derivatives Derivatives not designated as hedging instrument under Generally Accepted Accounting Principals (Details) - Cross Currency Swap € in Thousands	Dec. 31, 2018EUR (€)
Derivatives designated as hedging instruments
Derivative [Line Items]
Derivative, Notional Amount	€ 174,000
Derivatives not designated as hedging instruments
Derivative [Line Items]
Derivative, Notional Amount	€ 0

Fair Value Measurements (Detail

Fair Value Measurements (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Level 1
Assets:
Total Assets	$ 0	$ 0
Liabilities:
Total Liabilities	0	0
Level 1 | Foreign currency forward contracts
Assets:
Foreign currency contract, asset fair value	0	0
Liabilities:
Foreign currency contract, liability fair value	0	0
Level 1 | Foreign currency option contracts
Assets:
Foreign currency contract, asset fair value	0	0
Level 2
Assets:
Total Assets	7,455	7,746
Liabilities:
Total Liabilities	25,415	35,386
Level 2 | Foreign currency forward contracts
Assets:
Foreign currency contract, asset fair value	7,210	7,660
Liabilities:
Foreign currency contract, liability fair value	25,415	35,386
Level 2 | Foreign currency option contracts
Assets:
Foreign currency contract, asset fair value	245	86
Level 3
Assets:
Total Assets	0	0
Liabilities:
Total Liabilities	0	0
Level 3 | Foreign currency forward contracts
Assets:
Foreign currency contract, asset fair value	0	0
Liabilities:
Foreign currency contract, liability fair value	0	0
Level 3 | Foreign currency option contracts
Assets:
Foreign currency contract, asset fair value	0	0
Fair Value
Assets:
Total Assets	7,455	7,746
Liabilities:
Total Liabilities	25,415	35,386
Fair Value | Foreign currency forward contracts
Assets:
Foreign currency contract, asset fair value	7,210	7,660
Liabilities:
Foreign currency contract, liability fair value	25,415	35,386
Fair Value | Foreign currency option contracts
Assets:
Foreign currency contract, asset fair value	$ 245	$ 86

Retirement Benefit Plans Part 1

Retirement Benefit Plans Part 1 (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Contribution Plan [Abstract]
Total cost of benefits for U.S. and Non-U.S. Plans	$ 11,926	$ 13,253	$ 12,108
Maximum employer contribution to 401(k) Plan as a percentage of employee's compensation	3.00%
Minimum service period required to be eligible for profit sharing contribution to 401(k) plan (in years)	1
Expenses for 401(k) Plan	$ 8,073	4,404	8,359
Pension Plan | Level 1
Fair Value of Plan Assets by Investment Type
Fair value of plan assets	6,408	6,305
Pension Plan | Level 2
Fair Value of Plan Assets by Investment Type
Fair value of plan assets	0	0
Pension Plan | Level 3
Fair Value of Plan Assets by Investment Type
Fair value of plan assets	10,842	11,163
Pension Plan | Cash and Cash Equivalents | Level 1
Fair Value of Plan Assets by Investment Type
Fair value of plan assets	6,408	6,305
Pension Plan | Cash and Cash Equivalents | Level 2
Fair Value of Plan Assets by Investment Type
Fair value of plan assets	0	0
Pension Plan | Cash and Cash Equivalents | Level 3
Fair Value of Plan Assets by Investment Type
Fair value of plan assets	0	0
Pension Plan | Investment Account held by Pension Plan | Level 1
Fair Value of Plan Assets by Investment Type
Fair value of plan assets	0	0
Pension Plan | Investment Account held by Pension Plan | Level 2
Fair Value of Plan Assets by Investment Type
Fair value of plan assets	0	0
Pension Plan | Investment Account held by Pension Plan | Level 3
Fair Value of Plan Assets by Investment Type
Fair value of plan assets	10,842	11,163
Pension Plan | Fair Value
Fair Value of Plan Assets by Investment Type
Fair value of plan assets	17,250	17,468
Pension Plan | Fair Value | Cash and Cash Equivalents
Fair Value of Plan Assets by Investment Type
Fair value of plan assets	6,408	6,305
Pension Plan | Fair Value | Investment Account held by Pension Plan
Fair Value of Plan Assets by Investment Type
Fair value of plan assets	10,842	11,163
Domestic Plan | Pension Plan
Defined Contribution Plan [Abstract]
Excess assets transferred	0	(6,305)
Fair Value of Plan Assets by Investment Type
Fair value of plan assets	0	0	46,389
Foreign Plan | Pension Plan
Defined Contribution Plan [Abstract]
Excess assets transferred	0	0
Fair Value of Plan Assets by Investment Type
Fair value of plan assets	10,842	11,163	9,562
Foreign Plan | U.K. Pension Plan | Pension Plan
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value at beginning of year	11,163	9,562
Purchases, sales, issuances and settlements, net	(856)	(535)
Net gain	1,138	1,190
Foreign currency	(603)	946
Fair value at end of year	$ 10,842	$ 11,163	$ 9,562

Retirement Benefit Plans Part 2

Retirement Benefit Plans Part 2 (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation	$ 2,217
Plans with accumulated benefit obligation in excess of plan assets
Accumulated benefit obligation	2,217	$ 2,427
Fair value of plan assets	0	0
Changes in Accumulated Other Comprehensive Loss:
Total recognized in other comprehensive loss (income)	$ (1,745)	(5,868)	$ 2,248
Amounts that will be amortized from accumulated other comprehensive income (loss) in next fiscal year
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets		$ 2,427
Other Postretirement Benefits Plan
Assumed healthcare cost trend rates
Healthcare cost trend rate assumption for the next year	6.38%	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	2,032	2,032
Effect of one-percentage-point change in assumed healthcare cost trends
Effect of one-percentage-point decrease on total of service and interest cost components	$ (26)
Effect of one-percentage-point increase on total of service and interest cost components	29
Effect of one-percentage-point decrease on postretirement benefit obligation	(599)
Effect of one-percentage-point increase on postretirement benefit obligation	672
Pension Plan
Amounts that will be amortized from accumulated other comprehensive income (loss) in next fiscal year
Net actuarial loss	104
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Transition Asset (Obligation), before Tax	$ 4
Postretirement Medical Benefits
Weighted-average assumptions used to determine benefit obligation
Discount rate	3.95%	3.26%
Rate of compensation increase	0.00%	0.00%
Weighted-average assumptions used to determine net periodic benefit costs
Discount rate	3.26%	3.58%	3.70%
Expected long-term rate of return on plan assets	0.00%	0.00%	0.00%
Rate of compensation increase	0.00%	0.00%	0.00%
Change in benefit obligation:
Benefit obligation at beginning of year	$ 9,604	$ 10,540
Service cost	45	60	$ 76
Interest cost	293	363	396
Plan participants' contributions	0	0
Actuarial loss (gain)	(485)	(524)
Foreign exchange	0	0
Benefits paid	(844)	(835)
Settlement	0	0
Change in fair value of plan assets and net accrued liabilities:
Benefit obligation at end of year	8,613	9,604	10,540
Fair value of plan assets at beginning of year	0	0
Actual return on plan assets	0	0
Employer contributions	844	835
Plan participants' contributions	0	0
Excess assets transferred to Defined Contribution Plan	0	0
Foreign exchange	0	0
Benefits paid	(844)	(835)
Settlement	0	0
Fair value of plan assets at end of year	0	0	0
Funded status at end of year	(8,613)	(9,604)
Amounts recognized in the Consolidated Balance Sheets consist of:
Noncurrent Other Assets	0	0
Current Liabilities	(779)	(771)
Long-Term Liabilities	(7,834)	(8,833)
Net accrued asset (liability)	(8,613)	(9,604)
Amounts recognized in Accumulated Other Comprehensive Loss consist of:
Net actuarial loss	444	(41)
Accumulated Other Comprehensive Loss	444	(41)
Components of the net periodic benefit (credit) cost
Service cost	45	60	76
Interest cost	293	363	396
Expected return on plan assets	0	0	0
Amortization of net actuarial loss	0	0	0
Amortization of prior service cost (credit)	0	0	0
Foreign currency	0	0	0
Net periodic benefit cost (credit)	338	423	472
Curtailment charge	0	0	0
Settlement credit	0	0	0
Net periodic benefit (credit) cost	338	423	472
Changes in Accumulated Other Comprehensive Loss:
Net actuarial loss (gain)	(485)	(524)	6
Amortization of prior service (cost) credit	0	0	0
Amortization of net actuarial loss	0	0	0
Settlement	0	0	0
Total recognized in other comprehensive loss (income)	(485)	(524)	6
Total recognized in net periodic cost and other comprehensive loss (income)	(147)	$ (101)	$ 478
Expected future benefit payments
2,019	779
2,020	830
2,021	752
2,022	755
2,023	715
2024 to 2028	3,424
Total	7,255
Amounts that will be amortized from accumulated other comprehensive income (loss) in next fiscal year
Net actuarial loss	$ 0
Domestic Plan | Pension Plan
Weighted-average assumptions used to determine benefit obligation
Discount rate	3.95%	3.28%
Rate of compensation increase	0.00%	0.00%
Weighted-average assumptions used to determine net periodic benefit costs
Discount rate	3.28%	3.92%	4.08%
Expected long-term rate of return on plan assets	0.00%	5.10%	5.20%
Rate of compensation increase	0.00%	0.00%	3.00%
Accumulated benefit obligations
Accumulated benefit obligations	$ 1,267	$ 1,414
Change in benefit obligation:
Benefit obligation at beginning of year	1,414	40,961
Service cost	0	0	$ 354
Interest cost	43	1,538	1,659
Plan participants' contributions	0	0
Actuarial loss (gain)	35	1,811
Foreign exchange	0	0
Benefits paid	(149)	(1,950)
Settlement	(76)	(40,946)
Change in fair value of plan assets and net accrued liabilities:
Benefit obligation at end of year	1,267	1,414	40,961
Fair value of plan assets at beginning of year	0	46,389
Actual return on plan assets	0	2,536
Employer contributions	225	276
Plan participants' contributions	0	0
Excess assets transferred to Defined Contribution Plan	0	(6,305)
Foreign exchange	0	0
Benefits paid	(149)	(1,950)
Settlement	(76)	(40,946)
Fair value of plan assets at end of year	0	0	46,389
Funded status at end of year	(1,267)	(1,414)
Amounts recognized in the Consolidated Balance Sheets consist of:
Noncurrent Other Assets	0	0
Current Liabilities	(146)	(140)
Long-Term Liabilities	(1,121)	(1,274)
Net accrued asset (liability)	(1,267)	(1,414)
Amounts recognized in Accumulated Other Comprehensive Loss consist of:
Net actuarial loss	(852)	(915)
Accumulated Other Comprehensive Loss	(852)	(915)
Components of the net periodic benefit (credit) cost
Service cost	0	0	354
Interest cost	43	1,538	1,659
Expected return on plan assets	0	(2,336)	(2,400)
Amortization of net actuarial loss	49	43	41
Amortization of prior service cost (credit)	0	0	41
Foreign currency	0	0	0
Net periodic benefit cost (credit)	92	(755)	(305)
Curtailment charge	0	0	0
Settlement credit	49	6,373	0
Net periodic benefit (credit) cost	141	5,618	(305)
Changes in Accumulated Other Comprehensive Loss:
Net actuarial loss (gain)	35	1,611	633
Amortization of prior service (cost) credit	0	0	(41)
Amortization of net actuarial loss	(49)	(43)	(41)
Settlement	(49)	(6,373)	0
Total recognized in other comprehensive loss (income)	(63)	(4,805)	551
Total recognized in net periodic cost and other comprehensive loss (income)	78	$ 813	$ 246
Expected future benefit payments
2,019	146
2,020	138
2,021	129
2,022	121
2,023	112
2024 to 2028	468
Total	1,114
Foreign Plan | Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), before Tax	$ 109
Weighted-average assumptions used to determine benefit obligation
Discount rate	2.72%	2.45%
Rate of compensation increase	3.50%	3.50%
Weighted-average assumptions used to determine net periodic benefit costs
Discount rate	2.45%	2.64%	3.59%
Expected long-term rate of return on plan assets	3.80%	3.90%	4.60%
Rate of compensation increase	3.50%	3.50%	3.50%
Change in benefit obligation:
Benefit obligation at beginning of year	$ 12,144	$ 11,136
Service cost	126	132	$ 103
Interest cost	280	298	358
Plan participants' contributions	13	14
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment	109
Actuarial loss (gain)	(514)	327
Foreign exchange	583	(1,097)
Benefits paid	(1,196)	(860)
Settlement	0	0
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Curtailment	(165)
Change in fair value of plan assets and net accrued liabilities:
Benefit obligation at end of year	10,214	12,144	11,136
Fair value of plan assets at beginning of year	11,163	9,562
Actual return on plan assets	1,138	1,189
Employer contributions	327	313
Plan participants' contributions	13	14
Excess assets transferred to Defined Contribution Plan	0	0
Foreign exchange	(603)	945
Benefits paid	(1,196)	(860)
Settlement	0	0
Fair value of plan assets at end of year	10,842	11,163	9,562
Funded status at end of year	628	(981)
Amounts recognized in the Consolidated Balance Sheets consist of:
Noncurrent Other Assets	1,578	0
Current Liabilities	(34)	(36)
Long-Term Liabilities	(916)	(945)
Net accrued asset (liability)	628	(981)
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax	(109)
Amounts recognized in Accumulated Other Comprehensive Loss consist of:
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax	(109)
Net actuarial loss	42	(1,245)
Accumulated Other Comprehensive Loss	(67)	(1,245)
Components of the net periodic benefit (credit) cost
Service cost	126	132	103
Interest cost	280	298	358
Expected return on plan assets	(403)	(379)	(452)
Amortization of net actuarial loss	38	74	27
Amortization of prior service cost (credit)	0	0	0
Foreign currency	35	(1)	97
Net periodic benefit cost (credit)	76	124	133
Curtailment charge	(165)	0	0
Settlement credit	0	0	0
Net periodic benefit (credit) cost	(89)	124	133
Changes in Accumulated Other Comprehensive Loss:
Net actuarial loss (gain)	(1,249)	(465)	1,718
Amortization of prior service (cost) credit	(19)	0	0
Amortization of net actuarial loss	(38)	(74)	(27)
Settlement	0	0	0
Total recognized in other comprehensive loss (income)	(1,197)	(539)	1,691
Total recognized in net periodic cost and other comprehensive loss (income)	(1,286)	(415)	$ 1,824
Expected future benefit payments
2,019	243
2,020	249
2,021	257
2,022	265
2,023	275
2024 to 2028	1,511
Total	2,800
Nonqualified Plan | Domestic Plan
Defined Benefit Plans and Other Postretirement Benefit Plans
Expected future employer contributions in the next fiscal year	146
German Pension Plan | Foreign Plan | Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans
Expected future employer contributions in the next fiscal year	34
Accumulated benefit obligations
Accumulated benefit obligations	950	1,013
Retiree Plan | Domestic Plan
Defined Benefit Plans and Other Postretirement Benefit Plans
Expected future employer contributions in the next fiscal year	779
U.K. Pension Plan | Foreign Plan | Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans
Expected future employer contributions in the next fiscal year	360
Accumulated benefit obligations
Accumulated benefit obligations	$ 9,264	$ 11,131

Shareholders' Equity Part 1 (De

Shareholders' Equity Part 1 (Details) - USD ($) $ / shares in Units, $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Stockholders' Equity Note [Abstract]
Number of shares authorized for issue (in shares)	60,000,000
Common Stock, par value (in dollars per share)	$ 0.375	$ 0.375
Accumulated Other Comprehensive Loss, Net of Tax
Foreign currency translation adjustments	$ (31,831)	$ (15,778)	$ (44,444)
Pension and retiree medical benefits	(332)	(1,610)	(5,391)
Cash flow hedge	(5,031)	(4,935)	(88)
Total Accumulated Other Comprehensive Loss	$ (37,194)	$ (22,323)	$ (49,923)

Shareholders' Equity Part 2 (De

Shareholders' Equity Part 2 (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Loss
Balance at the beginning of the year	$ (22,323)	$ (49,923)
Other comprehensive income (loss) before reclassifications	(5,635)
Amounts reclassified from Accumulated Other Comprehensive Loss	(7,973)
Tax Cuts And Jobs Act of 2017 Reclassification From AOCI to Retained Earnings	(1,263)
Net current period other comprehensive income (loss)	14,871	(27,600)	$ 1,794
Balance at the end of the year	(37,194)	(22,323)	$ (49,923)
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Loss
Balance at the beginning of the year	(15,778)
Other comprehensive income (loss) before reclassifications	(16,053)
Amounts reclassified from Accumulated Other Comprehensive Loss	0
Tax Cuts And Jobs Act of 2017 Reclassification From AOCI to Retained Earnings	0
Net current period other comprehensive income (loss)	16,053
Balance at the end of the year	(31,831)	(15,778)
Pension and Postretirement Benefits
Accumulated Other Comprehensive Loss
Balance at the beginning of the year	(1,610)
Other comprehensive income (loss) before reclassifications	1,293
Amounts reclassified from Accumulated Other Comprehensive Loss	122
Tax Cuts And Jobs Act of 2017 Reclassification From AOCI to Retained Earnings	(137)
Net current period other comprehensive income (loss)	(1,278)
Balance at the end of the year	(332)	(1,610)
Cash Flow Hedge
Accumulated Other Comprehensive Loss
Balance at the beginning of the year	(4,935)
Other comprehensive income (loss) before reclassifications	9,125
Amounts reclassified from Accumulated Other Comprehensive Loss	(8,095)
Tax Cuts And Jobs Act of 2017 Reclassification From AOCI to Retained Earnings	(1,126)
Net current period other comprehensive income (loss)	96
Balance at the end of the year	$ (5,031)	$ (4,935)

Commitments and Contingencies_2

Commitments and Contingencies (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Lease expiration date	Mar. 31, 2028
Rent expense	$ 23,348	$ 21,566	$ 18,640
Minimum rentals for aggregate lease commitments
2,019	15,200
2,020	8,973
2,021	5,535
2,022	3,592
2,023	2,636
Thereafter	4,215
Total	40,151
Aggregate residual value at lease expiration for vehicle leases	14,043
Guaranteed aggregate residual value at lease expiration for vehicle leases	8,404
Liability for the estimated end-of-term loss related to residual value guarantee	$ 243
Loans, Notes, Trade and Other Receivables Disclosure [Text Block]	5,360

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2018	Dec. 31, 2017
Income (Loss) from continuing operations
U.S. operations		$ 23,913	$ 7,465	$ 54,018
Foreign operations		11,929	(8,757)	12,473
Profit Before Income Taxes		35,842	(1,292)	66,491
Current:
Federal		3,731	2,590	15,962
Foreign		7,030	8,701	3,035
State		1,033	812	1,859
Current Income Tax Expense		11,794	12,103	20,856
Deferred:
Federal		(3,135)	1,640	(472)
Foreign		(6,012)	(8,699)	(434)
State		(343)	(131)	(73)
Deferred Income Tax Expense		(9,490)	(7,190)	(979)
Total:
Federal		596	4,230	15,490
Foreign		1,018	2	2,601
State		690	681	1,786
Total Income Tax Expense		$ 2,304	$ 4,913	$ 19,877
Operating loss carryforwards
Federal Statutory Income Tax Rate, Historical			35.00%
Tax Cuts and Jobs Act of 2017 Corporate Federal Tax Rate		21.00%
Tax loss carryforwards					$ 18,649
Tax credit carryforwards					4,708	$ 1,575
Effective income tax rate reconciliation
Tax at statutory rate		21.00%	35.00%	35.00%
Increases (decreases) in the tax rate from:
State and local taxes, net of federal benefit		1.40%	(21.10%)	1.70%
Effect of foreign operations		(4.30%)	(70.80%)	(5.50%)
Transaction costs		(4.20%)	(226.30%)	0.00%
Effect of 2017 deferred rate change		(1.00%)	(154.30%)	0.00%
Transition Tax	(1.30%)	(1.00%)	(28.00%)	0.00%
Effect of changes in valuation allowances		6.60%	(126.50%)	1.90%
Domestic production activities deduction		0.40%	28.30%	(2.20%)
Share-based payments		(5.70%)	90.40%	0.00%
Research & Development credit		(3.60%)	82.90%	(1.30%)
Other, net		(3.20%)	10.20%	0.30%
Effective income tax rate		6.40%	(380.20%)	29.90%
Deferred Tax Assets:
Inventories, principally due to changes in inventory reserves					3,335	4,757
Employee wages and benefits, principally due to accruals for financial reporting purposes					11,642	11,031
Warranty reserves accrued for financial reporting purposes					2,610	2,578
Receivable, principally due to allowance for doubtful accounts and tax accounting method for equipment rentals					1,728	2,138
Tax loss carryforwards					7,765	11,383
Tax credit carryforwards					4,708	1,575
Other					4,712	3,630
Gross Deferred Tax Assets					36,500	37,092
Less: valuation allowance					(11,519)	(9,691)
Total Net Deferred Tax Assets					24,981	27,401
Deferred Tax Liabilities:
Property, Plant and Equipment, principally due to differences in depreciation and related gains					9,882	9,042
Goodwill and Intangible Assets					45,628	60,450
Total Deferred Tax Liabilities					55,510	69,492
Net Deferred Tax Liabilities					(30,529)	(42,091)
Reconciliation of unrecognized tax benefits
Balance at January 1,	$ 2,232	$ 2,232	$ 2,477
Increases as a result of tax positions taken during the current year		370	329
Increases as a result of tax positions taken in prior period		74
Increase reslted to prior period tax positions of acquired entities		3,833	236
Decreases relating to settlement with tax authorities		0	(68)
Reductions as a result of a lapse of the applicable statute of limitations		(1,274)	(770)
Increases (Decreases) as a result of foreign currency fluctuations		418	28
Balance at December 31,		5,653	2,232	$ 2,477
Unrecognized tax benefits that would impact the effective tax rate					5,473	1,992
Unrecognized Tax Benefits	$ 2,232	$ 2,232	$ 2,477	$ 2,477	5,653	2,232
Accrued interest and penalties					416	$ 482
Minimum
Income Tax General Disclosure [Abstract]
Income Tax Examination, Year under Examination		2,014
Maximum
Income Tax General Disclosure [Abstract]
Income Tax Examination, Year under Examination		2,016
U.S.
Operating loss carryforwards
Tax credit carryforwards					1,268
Income Tax General Disclosure [Abstract]
Undistributed earnings of non-U.S. subsidiaries					1,572
Deferred Tax Assets:
Tax credit carryforwards					1,268
Dutch
Operating loss carryforwards
Foreign tax credit carryforwards					1,628
FOREIGN
Operating loss carryforwards
Tax loss carryforwards					35,593
Tax loss carryforwards expiration		$ 16,944
Foreign tax credit carryforwards					$ 1,812

Share-Based Compensation (Detai

Share-Based Compensation (Details) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2017USD ($)$ / sharesshares	Dec. 31, 2018USD ($)$ / sharesshares	Dec. 31, 2017USD ($)$ / sharesshares	Dec. 31, 2016USD ($)$ / sharesshares	Apr. 26, 2017shares	Apr. 24, 2013shares
Share-based Compensation Arrangement by Share-based Payment Award
Number of plans		4
Share-based compensation expense | $		$ 8,314	$ 5,891	$ 3,875
Excess Tax Benefit from Share-based Compensation, before ASU adoption | $		2,060	1,168
Excess Tax Benefit on Stock Plans | $		$ 0	$ 0	$ 686
Number of stock appreciation rights granted (in shares)			0	0
Valuation assumptions
Expected volatility, minimum		25.00%	25.00%	29.00%
Expected volatiity, maximum		25.00%	26.00%	32.00%
Weighted-average expected volatility		25.00%	26.00%	32.00%
Expected dividend yield, minimum		1.20%	1.20%	1.30%
Expected dividend yield, maximum		1.20%	1.30%	1.50%
Weighted-average expected dividend yield		1.20%	1.30%	1.30%
Expected term, in years		5 years	5 years	5 years
Risk-free interest rate, minimum		2.60%	1.70%	1.10%
Risk-free interest rate, maximum		2.90%	2.00%	1.40%
2010 Plan
Share-based Compensation Arrangement by Share-based Payment Award
Shares authorized for future awards (in shares)						1,500,000
Amended 2010 Plan
Share-based Compensation Arrangement by Share-based Payment Award
Shares authorized for future awards (in shares)						2,600,000
2017 Plan
Share-based Compensation Arrangement by Share-based Payment Award
Shares authorized for future awards (in shares)					1,200,000
Shares reserved for issuance (in shares)		761,382
All Plans Excluding 2010 Plan
Share-based Compensation Arrangement by Share-based Payment Award
Shares reserved for issuance (in shares)		897,315
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award
Ratio of new awards that vest each year		one-third
Vesting period of new awards granted (in years)		3 years
Contractual term of new awards (in years)		10 years
Weighted-average grant date fair value (in dollars per share) | $ / shares	$ 16.39	$ 16.07		$ 13.61
Total intrinsic value of stock options exercised | $		$ 10,305	$ 4,450	$ 3,408
Aggregate intrinsic value of options outstanding | $		$ 5,987
Weighted-average remaining contractual life for options outstanding (in years)		5 years 11 months
Weighted-average remaining contractual life for options exercisable (in years)		4 years 6 months
Unrecognized compensation cost for nonvested options | $		$ 1,944
Compensation cost not yet recognized, weighted-average period for recognition (in years)		1 year 4 months
Shares activity
Outstanding at beginning of year (in shares)		1,135,608
Granted (in shares)		202,623
Exercised (in shares)		(223,352)
Forfeited (in shares)		(30,312)
Outstanding at end of year (in shares)	1,135,608	1,084,567	1,135,608
Exercisable at end of year (in shares)		711,499
Weighted-Average Exercise Price
Outstanding at beginning of year (in dollars per share) | $ / shares		$ 47.47
Granted (in dollars per share) | $ / shares		67.85
Exercised (in dollars per share) | $ / shares		26.33
Forfeited (in dollars per share) | $ / shares		66.06
Outstanding at end of year (in dollars per share) | $ / shares	$ 47.47	55.11	$ 47.47
Exercisable at end of year (in dollars per share) | $ / shares		$ 48.94
Restricted Share Awards
Share-based Compensation Arrangement by Share-based Payment Award
Vesting period of new awards granted (in years)		3 years
Unrecognized compensation cost for nonvested options | $		$ 1,196
Compensation cost not yet recognized, weighted-average period for recognition (in years)		1 year 7 months
Fair value of shares vested | $		$ 978	$ 1,463	1,970
Shares activity
Nonvested at beginning of year (in shares)		99,789
Granted (in shares)		16,377
Vested (in shares)		(14,384)
Forfeited (in shares)		(1,561)
Nonvested at end of year (in shares)	99,789	100,221	99,789
Weighted-Average Exercise Price
Nonvested at beginning of year (in dollars per share) | $ / shares		$ 53.11
Granted (in dollars per share) | $ / shares		67.70
Vested (in dollars per share) | $ / shares		68
Forfeited (in dollars per share) | $ / shares		67.39
Nonvested at end of year (in dollars per share) | $ / shares	$ 53.11	$ 53.52	$ 53.11
Performance Share Awards
Share-based Compensation Arrangement by Share-based Payment Award
Vesting period of new awards granted (in years)		3 years
Unrecognized compensation cost for nonvested options | $		$ 3,287
Compensation cost not yet recognized, weighted-average period for recognition (in years)		1 year 10 months
Fair value of shares vested | $		$ 0	$ 1,240	1,703
Maximum increase in the number of shares of common stock a participant receives based on the achievement of performance goals (as a percent)		200.00%
Lowest potential number of shares of common stock that could be received based on the achievement level of performance goals (in shares)		0
Shares activity
Nonvested at beginning of year (in shares)		123,024
Granted (in shares)		47,997
Forfeited (in shares)		(43,974)
Nonvested at end of year (in shares)	123,024	127,047	123,024
Weighted-Average Exercise Price
Nonvested at beginning of year (in dollars per share) | $ / shares		$ 63.09
Granted (in dollars per share) | $ / shares		67.84
Forfeited (in dollars per share) | $ / shares		66.23
Nonvested at end of year (in dollars per share) | $ / shares	$ 63.09	$ 63.80	$ 63.09
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award
Vesting period of new awards granted (in years)		3 years
Unrecognized compensation cost for nonvested options | $		$ 4,473
Compensation cost not yet recognized, weighted-average period for recognition (in years)		2 years
Fair value of shares vested | $		$ 899	$ 962
Shares activity
Nonvested at beginning of year (in shares)		43,125
Granted (in shares)		83,380
Vested (in shares)		(15,427)
Forfeited (in shares)		(9,123)
Nonvested at end of year (in shares)	43,125	101,955	43,125
Weighted-Average Exercise Price
Nonvested at beginning of year (in dollars per share) | $ / shares		$ 64.67
Granted (in dollars per share) | $ / shares		66.83
Vested (in dollars per share) | $ / shares		58.27
Forfeited (in dollars per share) | $ / shares		66.60
Nonvested at end of year (in dollars per share) | $ / shares	$ 64.67	$ 67.23	$ 64.67
Share-Based Liabilities
Share-based Compensation Arrangement by Share-based Payment Award
Total share-based liabilities | $	$ 175	$ 213	$ 175
Amounts paid out related to share-based liability awards | $		$ 32	$ 45	$ 62

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Numerator:
Net Earnings	$ 7,717	$ 9,676	$ 12,744	$ 3,274	$ (3,206)	$ 3,559	$ (2,591)	$ (3,957)	$ 33,412	$ (6,195)	$ 46,614
Basic - Weighted Average Shares Outstanding									17,940,438	17,695,390	17,523,267
Effect of dilutive securities									398,131	0	452,916
Diluted - Weighted Average Shares Outstanding									18,338,569	17,695,390	17,976,183
Basic Earnings per Share	$ 0.43	$ 0.54	$ 0.71	$ 0.18	$ (0.18)	$ 0.20	$ (0.15)	$ (0.22)	$ 1.86	$ (0.35)	$ 2.66
Diluted (in dollars per share)	$ 0.42	$ 0.52	$ 0.69	$ 0.18	$ (0.18)	$ 0.20	$ (0.15)	$ (0.22)	$ 1.82	$ (0.35)	$ 2.59
Anti-dilutive securities excluded from earnings per share calculation (in shares)									293,356	711,212	356,598

Segment Reporting (Details)

Segment Reporting (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018USD ($)	Sep. 30, 2018USD ($)	Jun. 30, 2018USD ($)	Mar. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Sep. 30, 2017USD ($)	Jun. 30, 2017USD ($)	Mar. 31, 2017USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Segment Reporting [Abstract]
Number of operating segments									4
Number of reportable segments									1
Number of customers exceeding ten percent of net sales									0
Concentration Risk, Percentage									10.00%
Revenues from External Customers and Long-Lived Assets
Net Sales	$ 285,212	$ 273,255	$ 292,197	$ 272,847	$ 279,295	$ 261,921	$ 270,791	$ 191,059	$ 1,123,511	$ 1,003,066	$ 808,572
Long-Lived Assets	508,413				559,728				508,413	559,728	158,677
Equipment
Revenues from External Customers and Long-Lived Assets
Net Sales									729,993	636,875	491,075
Parts and consumables
Revenues from External Customers and Long-Lived Assets
Net Sales									222,345	202,452	173,632
Service and other
Revenues from External Customers and Long-Lived Assets
Net Sales									141,346	132,332	114,719
Specialty surface coatings
Revenues from External Customers and Long-Lived Assets
Net Sales									29,827	31,407	29,146
Americas
Revenues from External Customers and Long-Lived Assets
Net Sales									690,996	640,274	607,026
Long-Lived Assets	118,609				132,659				118,609	132,659	134,737
Europe, Middle East, Africa
Revenues from External Customers and Long-Lived Assets
Net Sales									335,603	273,738	129,046
Long-Lived Assets	385,659				422,338				385,659	422,338	19,606
Asia Pacific
Revenues from External Customers and Long-Lived Assets
Net Sales									96,912	89,054	72,500
Long-Lived Assets	4,145				4,731				4,145	4,731	$ 4,334
ITALY
Revenues from External Customers and Long-Lived Assets
Long-Lived Assets	$ 355,460				$ 393,917				$ 355,460	$ 393,917

Consolidated Quarterly Data (De

Consolidated Quarterly Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Net Sales	$ 285,212	$ 273,255	$ 292,197	$ 272,847	$ 279,295	$ 261,921	$ 270,791	$ 191,059	$ 1,123,511	$ 1,003,066	$ 808,572
Gross Profit	112,172	106,509	117,225	109,116	113,866	103,081	103,130	79,736	445,033	399,813	351,595
Net Earnings	$ 7,717	$ 9,676	$ 12,744	$ 3,274	$ (3,206)	$ 3,559	$ (2,591)	$ (3,957)	$ 33,412	$ (6,195)	$ 46,614
Basic (in dollars per share)	$ 0.43	$ 0.54	$ 0.71	$ 0.18	$ (0.18)	$ 0.20	$ (0.15)	$ (0.22)	$ 1.86	$ (0.35)	$ 2.66
Diluted (in dollars per share)	0.42	0.52	0.69	0.18	(0.18)	0.20	(0.15)	(0.22)	1.82	(0.35)	2.59
Cash dividends declared per common share (in dollars per share)	$ 0.22	$ 0.21	$ 0.21	$ 0.21	$ 0.21	$ 0.21	$ 0.21	$ 0.21	$ 0.85	$ 0.84	$ 0.81

Separate Financial Informatio_3

Separate Financial Information of Guarantor Subsidiaries Statements of Earnings (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Net Sales	$ 285,212	$ 273,255	$ 292,197	$ 272,847	$ 279,295	$ 261,921	$ 270,791	$ 191,059	$ 1,123,511	$ 1,003,066	$ 808,572
Cost of Sales									678,478	603,253	456,977
Gross Profit	112,172	106,509	117,225	109,116	113,866	103,081	103,130	79,736	445,033	399,813	351,595
Operating Expense:
Research and Development Expense									30,739	32,013	34,738
Selling and Administrative Expense									356,316	334,782	248,592
Total Operating Expense									387,055	366,795	283,330
Profit from Operations									57,978	33,018	68,265
Other Income and Expenses [Abstract]
Equity in Earnings of Affiliates									0	0	0
Interest (Expense) Income, Net									(20,307)	(22,989)	(949)
Intercompany Interest Income (Expense)									0	0	0
Net Foreign Currency Transaction Losses									(1,100)	(3,387)	(392)
Other (Expense) Income, Net									(729)	(7,934)	(433)
Total Other Expense, Net									(22,136)	(34,310)	(1,774)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest									35,842	(1,292)	66,491
Income Tax Expense (Benefit)									2,304	4,913	19,877
Net Earnings (Loss) Including Noncontrolling Interest									33,538	(6,205)	46,614
Net Earnings Attributable to Noncontrolling Interest									126	(10)	0
Net Earnings (Loss) Attributable to Tennant Company	$ 7,717	$ 9,676	$ 12,744	$ 3,274	$ (3,206)	$ 3,559	$ (2,591)	$ (3,957)	33,412	(6,195)	46,614
Parent Company
Debt Instrument [Line Items]
Net Sales									494,341	454,703	455,375
Cost of Sales									336,398	311,897	299,459
Gross Profit									157,943	142,806	155,916
Operating Expense:
Research and Development Expense									24,455	27,219	32,378
Selling and Administrative Expense									116,528	110,414	95,340
Total Operating Expense									140,983	137,633	127,718
Profit from Operations									16,960	5,173	28,198
Other Income and Expenses [Abstract]
Equity in Earnings of Affiliates									27,409	12,754	34,068
Interest (Expense) Income, Net									(20,466)	(22,659)	(1,204)
Intercompany Interest Income (Expense)									14,597	12,519	7,157
Net Foreign Currency Transaction Losses									(370)	857	648
Other (Expense) Income, Net									(2,288)	(9,936)	(2,376)
Total Other Expense, Net									18,882	(6,465)	38,293
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest									35,842	(1,292)	66,491
Income Tax Expense (Benefit)									2,304	4,913	19,877
Net Earnings (Loss) Including Noncontrolling Interest									33,538	(6,205)	46,614
Net Earnings Attributable to Noncontrolling Interest									126	(10)
Net Earnings (Loss) Attributable to Tennant Company									33,412	(6,195)	46,614
Guarantor Subsidiaries
Debt Instrument [Line Items]
Net Sales									634,341	594,405	587,815
Cost of Sales									533,800	488,972	483,075
Gross Profit									100,541	105,433	104,740
Operating Expense:
Research and Development Expense									1,090	315	429
Selling and Administrative Expense									76,623	78,516	74,643
Total Operating Expense									77,713	78,831	75,072
Profit from Operations									22,828	26,602	29,668
Other Income and Expenses [Abstract]
Equity in Earnings of Affiliates									2,249	2,004	2,192
Interest (Expense) Income, Net									0	0	0
Intercompany Interest Income (Expense)									(5,760)	(5,776)	(5,570)
Net Foreign Currency Transaction Losses									(21)	0	(652)
Other (Expense) Income, Net									(2,434)	(736)	(573)
Total Other Expense, Net									(5,966)	(4,508)	(4,603)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest									16,862	22,094	25,065
Income Tax Expense (Benefit)									4,022	8,070	9,443
Net Earnings (Loss) Including Noncontrolling Interest									12,840	14,024	15,622
Net Earnings Attributable to Noncontrolling Interest									0	0
Net Earnings (Loss) Attributable to Tennant Company									12,840	14,024	15,622
Non-Guarantor Subsidiaries
Debt Instrument [Line Items]
Net Sales									570,627	471,559	290,349
Cost of Sales									383,010	321,759	199,336
Gross Profit									187,617	149,800	91,013
Operating Expense:
Research and Development Expense									5,194	4,479	1,931
Selling and Administrative Expense									161,911	145,852	78,609
Total Operating Expense									167,105	150,331	80,540
Profit from Operations									20,512	(531)	10,473
Other Income and Expenses [Abstract]
Equity in Earnings of Affiliates									5,374	28,855	0
Interest (Expense) Income, Net									196	(299)	255
Intercompany Interest Income (Expense)									(8,837)	(6,743)	(1,587)
Net Foreign Currency Transaction Losses									(709)	(4,244)	(388)
Other (Expense) Income, Net									2,862	2,841	2,516
Total Other Expense, Net									(1,114)	20,410	796
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest									19,398	19,879	11,269
Income Tax Expense (Benefit)									388	(98)	2,427
Net Earnings (Loss) Including Noncontrolling Interest									19,010	19,977	8,842
Net Earnings Attributable to Noncontrolling Interest									126	(10)
Net Earnings (Loss) Attributable to Tennant Company									18,884	19,987	8,842
Eliminations
Debt Instrument [Line Items]
Net Sales									(575,798)	(517,601)	(524,967)
Cost of Sales									(574,730)	(519,375)	(524,893)
Gross Profit									(1,068)	1,774	(74)
Operating Expense:
Research and Development Expense									0	0	0
Selling and Administrative Expense									1,254	0	0
Total Operating Expense									1,254	0	0
Profit from Operations									(2,322)	1,774	(74)
Other Income and Expenses [Abstract]
Equity in Earnings of Affiliates									(35,032)	(43,613)	(36,260)
Interest (Expense) Income, Net									(37)	(31)	0
Intercompany Interest Income (Expense)									0	0	0
Net Foreign Currency Transaction Losses									0	0	0
Other (Expense) Income, Net									1,131	(103)	0
Total Other Expense, Net									(33,938)	(43,747)	(36,260)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest									(36,260)	(41,973)	(36,334)
Income Tax Expense (Benefit)									(4,410)	(7,972)	(11,870)
Net Earnings (Loss) Including Noncontrolling Interest									(31,850)	(34,001)	(24,464)
Net Earnings Attributable to Noncontrolling Interest									(126)	10
Net Earnings (Loss) Attributable to Tennant Company									$ (31,724)	$ (34,011)	$ (24,464)

Separate Financial Informatio_4

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)

Separate Financial Informatio_5

Separate Financial Information of Guarantor Subsidiaries Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current Assets:
Cash and Cash Equivalents	$ 85,609	$ 58,398
Restricted Cash	525	653
Net Receivables	216,170	209,516
Intercompany Receivables	0	0
Inventories	135,133	127,694
Prepaid Expenses	22,141	19,351
Other Current Assets	9,066	7,503
Total Current Assets	468,644	423,115
Property, Plant and Equipment	386,641	382,768
Accumulated Depreciation	(223,194)	(202,750)
Property, Plant and Equipment, Net	163,447	180,018
Deferred Income Taxes	15,489	11,134
Investment in Affiliates	0	0
Intercompany Loans	0	0
Goodwill	182,671	186,044	$ 21,065
Intangible Assets, Net	146,546	172,347
Other Assets	15,747	21,319
Total Assets	992,544	993,977
Current Liabilities:
Current Portion of Long-Term Debt	27,005	30,883
Accounts Payable	98,398	96,082
Intercompany Payables	0	0
Employee Compensation and Benefits	49,453	37,257
Income Taxes Payable	2,123	2,838
Other Current Liabilities	71,895	69,447
Total Current Liabilities	248,874	236,507
Long-Term Liabilities:
Long-Term Debt	328,060	345,956
Intercompany Loans	0	0
Employee-Related Benefits	21,110	23,867
Deferred Income Taxes	46,018	53,225
Other Liabilities	32,130	35,948
Total Long-Term Liabilities	427,318	458,996
Total Liabilities	676,192	695,503
Common Stock	6,797	6,705
Additional Paid-In Capital	28,550	15,089
Retained Earnings	316,269	297,032
Accumulated Other Comprehensive Loss	(37,194)	(22,323)	(49,923)
Total Tennant Company Shareholders’ Equity	314,422	296,503
Noncontrolling Interest	1,930	1,971
Total Equity	316,352	298,474	$ 278,543	$ 252,207
Total Liabilities and Total Equity	992,544	993,977
Parent Company
Current Assets:
Cash and Cash Equivalents	24,779	18,469
Restricted Cash	0	0
Net Receivables	866	683
Intercompany Receivables	29,976	53,444
Inventories	37,154	29,450
Prepaid Expenses	12,565	8,774
Other Current Assets	4,935	4,030
Total Current Assets	110,275	114,850
Property, Plant and Equipment	229,826	225,064
Accumulated Depreciation	(159,344)	(146,320)
Property, Plant and Equipment, Net	70,482	78,744
Deferred Income Taxes	4,035	1,308
Investment in Affiliates	420,897	392,486
Intercompany Loans	301,555	304,822
Goodwill	12,870	12,869
Intangible Assets, Net	4,012	2,105
Other Assets	6,987	10,363
Total Assets	931,113	917,547
Current Liabilities:
Current Portion of Long-Term Debt	21,816	29,413
Accounts Payable	40,991	39,927
Intercompany Payables	149,460	133,778
Employee Compensation and Benefits	13,947	8,311
Income Taxes Payable	806	366
Other Current Liabilities	22,387	20,183
Total Current Liabilities	249,407	231,978
Long-Term Liabilities:
Long-Term Debt	326,460	344,147
Intercompany Loans	3,205	0
Employee-Related Benefits	11,041	11,160
Deferred Income Taxes	0	0
Other Liabilities	24,648	31,788
Total Long-Term Liabilities	365,354	387,095
Total Liabilities	614,761	619,073
Common Stock	6,797	6,705
Additional Paid-In Capital	28,550	15,089
Retained Earnings	316,269	297,032
Accumulated Other Comprehensive Loss	(37,194)	(22,323)
Total Tennant Company Shareholders’ Equity	314,422	296,503
Noncontrolling Interest	1,930	1,971
Total Equity	316,352	298,474
Total Liabilities and Total Equity	931,113	917,547
Guarantor Subsidiaries
Current Assets:
Cash and Cash Equivalents	1,610	507
Restricted Cash	0	0
Net Receivables	94,763	88,629
Intercompany Receivables	148,961	133,778
Inventories	13,381	12,695
Prepaid Expenses	782	1,172
Other Current Assets	396	0
Total Current Assets	259,893	236,781
Property, Plant and Equipment	12,677	12,155
Accumulated Depreciation	(6,913)	(6,333)
Property, Plant and Equipment, Net	5,764	5,822
Deferred Income Taxes	3,072	2,669
Investment in Affiliates	12,142	11,273
Intercompany Loans	0	0
Goodwill	1,726	1,739
Intangible Assets, Net	2,684	2,898
Other Assets	(2)	0
Total Assets	285,279	261,182
Current Liabilities:
Current Portion of Long-Term Debt	0	0
Accounts Payable	4,982	3,018
Intercompany Payables	0	1,963
Employee Compensation and Benefits	16,890	10,355
Income Taxes Payable	0	0
Other Current Liabilities	17,939	15,760
Total Current Liabilities	39,811	31,096
Long-Term Liabilities:
Long-Term Debt	0	0
Intercompany Loans	128,000	128,000
Employee-Related Benefits	2,015	3,992
Deferred Income Taxes	0	0
Other Liabilities	2,899	2,483
Total Long-Term Liabilities	132,914	134,475
Total Liabilities	172,725	165,571
Common Stock	0	0
Additional Paid-In Capital	77,551	72,483
Retained Earnings	36,633	23,797
Accumulated Other Comprehensive Loss	(1,630)	(669)
Total Tennant Company Shareholders’ Equity	112,554	95,611
Noncontrolling Interest	0	0
Total Equity	112,554	95,611
Total Liabilities and Total Equity	285,279	261,182
Non-Guarantor Subsidiaries
Current Assets:
Cash and Cash Equivalents	59,220	39,422
Restricted Cash	525	653
Net Receivables	120,541	120,204
Intercompany Receivables	0	0
Inventories	94,680	94,542
Prepaid Expenses	9,282	9,405
Other Current Assets	3,735	3,473
Total Current Assets	287,983	267,699
Property, Plant and Equipment	144,138	145,549
Accumulated Depreciation	(56,937)	(50,097)
Property, Plant and Equipment, Net	87,201	95,452
Deferred Income Taxes	8,382	7,157
Investment in Affiliates	20,768	20,811
Intercompany Loans	3,205	4,983
Goodwill	168,075	171,436
Intangible Assets, Net	139,850	167,344
Other Assets	8,762	10,956
Total Assets	724,226	745,838
Current Liabilities:
Current Portion of Long-Term Debt	5,189	1,470
Accounts Payable	52,425	53,137
Intercompany Payables	29,477	51,481
Employee Compensation and Benefits	18,616	18,591
Income Taxes Payable	1,984	2,472
Other Current Liabilities	31,390	33,504
Total Current Liabilities	139,081	160,655
Long-Term Liabilities:
Long-Term Debt	1,600	1,809
Intercompany Loans	173,555	181,805
Employee-Related Benefits	8,054	8,715
Deferred Income Taxes	46,018	53,225
Other Liabilities	4,583	1,677
Total Long-Term Liabilities	233,810	247,231
Total Liabilities	372,891	407,886
Common Stock	11,131	11,131
Additional Paid-In Capital	399,459	384,460
Retained Earnings	(2,532)	(21,219)
Accumulated Other Comprehensive Loss	(58,653)	(38,391)
Total Tennant Company Shareholders’ Equity	349,405	335,981
Noncontrolling Interest	1,930	1,971
Total Equity	351,335	337,952
Total Liabilities and Total Equity	724,226	745,838
Eliminations
Current Assets:
Cash and Cash Equivalents	0	0
Restricted Cash	0	0
Net Receivables	0	0
Intercompany Receivables	(178,937)	(187,222)
Inventories	(10,082)	(8,993)
Prepaid Expenses	(488)	0
Other Current Assets	0	0
Total Current Assets	(189,507)	(196,215)
Property, Plant and Equipment	0	0
Accumulated Depreciation	0	0
Property, Plant and Equipment, Net	0	0
Deferred Income Taxes	0	0
Investment in Affiliates	(453,807)	(424,570)
Intercompany Loans	(304,760)	(309,805)
Goodwill	0	0
Intangible Assets, Net	0	0
Other Assets	0	0
Total Assets	(948,074)	(930,590)
Current Liabilities:
Current Portion of Long-Term Debt	0	0
Accounts Payable	0	0
Intercompany Payables	(178,937)	(187,222)
Employee Compensation and Benefits	0	0
Income Taxes Payable	(667)	0
Other Current Liabilities	179	0
Total Current Liabilities	(179,425)	(187,222)
Long-Term Liabilities:
Long-Term Debt	0	0
Intercompany Loans	(304,760)	(309,805)
Employee-Related Benefits	0	0
Deferred Income Taxes	0	0
Other Liabilities	0	0
Total Long-Term Liabilities	(304,760)	(309,805)
Total Liabilities	(484,185)	(497,027)
Common Stock	(11,131)	(11,131)
Additional Paid-In Capital	(477,010)	(456,943)
Retained Earnings	(34,101)	(2,578)
Accumulated Other Comprehensive Loss	60,283	39,060
Total Tennant Company Shareholders’ Equity	(461,959)	(431,592)
Noncontrolling Interest	(1,930)	(1,971)
Total Equity	(463,889)	(433,563)
Total Liabilities and Total Equity	$ (948,074)	$ (930,590)

Separate Financial Informatio_6

Separate Financial Information of Guarantor Subsidiaries Statements of Cash Flows (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
OPERATING ACTIVITIES
Net Cash Provided by Operating Activities		$ 79,970	$ 54,174	$ 57,878
INVESTING ACTIVITIES
Purchases of Property, Plant and Equipment		(18,780)	(20,437)	(26,526)
Proceeds from Disposals of Property, Plant and Equipment		112	2,511	615
Proceeds from Principal Payments Received on Long-Term Note Receivable		1,416	667	0
Proceeds from Sale of Business	$ 4,000	4,000	0	285
Acquisitions of Businesses, Net of Cash Acquired		0	(354,073)	(12,933)
Issuance of Long-Term Note Receivable		0	(1,500)	(2,000)
Purchases of Intangible Asset		(2,775)	(2,500)	0
Change in Investments in Subsidiaries		0	0	0
Loan Proceeds Received by the Parent from Subsidiaries		0
Loan Proceeds Received by Subsidiaries from the Parent		0
Loan Borrowings (Payments) from Subsidiaries			0	0
Net Cash Used in Investing Activities		(16,027)	(375,332)	(40,559)
FINANCING ACTIVITIES
Proceeds from Short-Term Debt		3,926	303,000	0
Repayments of Debt from Subsidiaries to Parent		0
Repayments of Debt from the Parent to Subsidiaries		0
Repayments of Short-term Debt		0	(303,000)	0
Loan Borrowings (Payments) from Parent			0	0
Change in Subsidiary Equity		0	0	0
Proceeds from Issuance of Long-Term Debt		11,000	440,000	15,000
Payments of Long-Term Debt		(38,255)	(96,248)	(3,460)
Purchases of Common Stock		0	0	(12,762)
Payments of Debt Issuance Costs		0	(16,482)	0
Change in Capital Lease Obligations		14	311	0
Proceeds from Issuances of Common Stock		5,880	6,875	5,271
Payments to Noncontrolling Interests		0	(30)	0
Excess Tax Benefit on Stock Plans		0	0	686
Dividends Paid		(15,343)	(14,953)	(14,293)
Net Cash (Used in) Provided by Financing Activities		(32,778)	319,473	(9,558)
Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents		(4,082)	2,186	(1,150)
NET INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH		27,083	501	6,611
Cash, Cash Equivalents and Restricted Cash at Beginning of Year	59,051	59,051	58,550	51,939
CASH, CASH EQUIVALENTS, RESTRICTED CASH AND RESTRICTED CASH EQUIVALENTS AT END OF YEAR		86,134	59,051	58,550
Parent Company
OPERATING ACTIVITIES
Net Cash Provided by Operating Activities		68,082	26,992	44,147
INVESTING ACTIVITIES
Purchases of Property, Plant and Equipment		(6,832)	(9,558)	(21,507)
Proceeds from Disposals of Property, Plant and Equipment		21	23	377
Proceeds from Principal Payments Received on Long-Term Note Receivable		0	0
Proceeds from Sale of Business		0		0
Acquisitions of Businesses, Net of Cash Acquired			(304)	0
Issuance of Long-Term Note Receivable			0	0
Purchases of Intangible Asset		(2,500)	(2,500)
Change in Investments in Subsidiaries		(15,622)	(199,028)	(19,594)
Loan Proceeds Received by the Parent from Subsidiaries		1,218
Loan Proceeds Received by Subsidiaries from the Parent		0
Loan Borrowings (Payments) from Subsidiaries			(159,780)	8,690
Net Cash Used in Investing Activities		(23,715)	(371,147)	(32,034)
FINANCING ACTIVITIES
Proceeds from Short-Term Debt		0	303,000
Repayments of Debt from Subsidiaries to Parent		0
Repayments of Debt from the Parent to Subsidiaries		(1,778)
Repayments of Short-term Debt			(303,000)
Loan Borrowings (Payments) from Parent			4,983	0
Change in Subsidiary Equity		0	0
Proceeds from Issuance of Long-Term Debt		11,000	440,000	15,000
Payments of Long-Term Debt		(38,000)	(96,142)	(3,429)
Purchases of Common Stock				(12,762)
Payments of Debt Issuance Costs			(16,482)
Change in Capital Lease Obligations		0	0
Proceeds from Issuances of Common Stock		5,880	6,875	5,271
Payments to Noncontrolling Interests			0
Excess Tax Benefit on Stock Plans				686
Dividends Paid		(15,343)	(14,953)	(14,293)
Net Cash (Used in) Provided by Financing Activities		(38,241)	324,281	(9,527)
Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents		184	(141)	63
NET INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH		6,310	(20,015)	2,649
Cash, Cash Equivalents and Restricted Cash at Beginning of Year	18,469	18,469	38,484	35,835
CASH, CASH EQUIVALENTS, RESTRICTED CASH AND RESTRICTED CASH EQUIVALENTS AT END OF YEAR		24,779	18,469	38,484
Guarantor Subsidiaries
OPERATING ACTIVITIES
Net Cash Provided by Operating Activities		1,202	280	239
INVESTING ACTIVITIES
Purchases of Property, Plant and Equipment		(99)	0	(13)
Proceeds from Disposals of Property, Plant and Equipment		0	1	0
Proceeds from Principal Payments Received on Long-Term Note Receivable		0	0
Proceeds from Sale of Business		0		0
Acquisitions of Businesses, Net of Cash Acquired			0	(11,539)
Issuance of Long-Term Note Receivable			0	0
Purchases of Intangible Asset		0	0
Change in Investments in Subsidiaries		0	0	0
Loan Proceeds Received by the Parent from Subsidiaries		0
Loan Proceeds Received by Subsidiaries from the Parent		0
Loan Borrowings (Payments) from Subsidiaries			0	0
Net Cash Used in Investing Activities		(99)	1	(11,552)
FINANCING ACTIVITIES
Proceeds from Short-Term Debt		0	0
Repayments of Debt from Subsidiaries to Parent		0
Repayments of Debt from the Parent to Subsidiaries		0
Repayments of Short-term Debt			0
Loan Borrowings (Payments) from Parent			0	7,969
Change in Subsidiary Equity		0	0	3,570
Proceeds from Issuance of Long-Term Debt		0	0	0
Payments of Long-Term Debt		0	0	0
Purchases of Common Stock				0
Payments of Debt Issuance Costs			0
Change in Capital Lease Obligations		0	0
Proceeds from Issuances of Common Stock		0	0	0
Payments to Noncontrolling Interests			0
Excess Tax Benefit on Stock Plans				0
Dividends Paid		0	0	0
Net Cash (Used in) Provided by Financing Activities		0	0	11,539
Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents		0	0	0
NET INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH		1,103	281	226
Cash, Cash Equivalents and Restricted Cash at Beginning of Year	507	507	226	0
CASH, CASH EQUIVALENTS, RESTRICTED CASH AND RESTRICTED CASH EQUIVALENTS AT END OF YEAR		1,610	507	226
Non-Guarantor Subsidiaries
OPERATING ACTIVITIES
Net Cash Provided by Operating Activities		10,888	27,711	14,090
INVESTING ACTIVITIES
Purchases of Property, Plant and Equipment		(11,849)	(10,879)	(5,006)
Proceeds from Disposals of Property, Plant and Equipment		91	2,487	238
Proceeds from Principal Payments Received on Long-Term Note Receivable		1,416	667
Proceeds from Sale of Business		4,000		285
Acquisitions of Businesses, Net of Cash Acquired			(353,769)	(1,394)
Issuance of Long-Term Note Receivable			(1,500)	(2,000)
Purchases of Intangible Asset		(275)	0
Change in Investments in Subsidiaries		0	0	0
Loan Proceeds Received by the Parent from Subsidiaries		0
Loan Proceeds Received by Subsidiaries from the Parent		1,778
Loan Borrowings (Payments) from Subsidiaries			(4,983)	0
Net Cash Used in Investing Activities		(4,839)	(367,977)	(7,877)
FINANCING ACTIVITIES
Proceeds from Short-Term Debt		3,926	0
Repayments of Debt from Subsidiaries to Parent		(1,218)
Repayments of Debt from the Parent to Subsidiaries		0
Repayments of Short-term Debt			0
Loan Borrowings (Payments) from Parent			159,780	(16,659)
Change in Subsidiary Equity		15,622	199,028	16,024
Proceeds from Issuance of Long-Term Debt		0	0	0
Payments of Long-Term Debt		(255)	(106)	(31)
Purchases of Common Stock				0
Payments of Debt Issuance Costs			0
Change in Capital Lease Obligations		14	311
Proceeds from Issuances of Common Stock		0	0	0
Payments to Noncontrolling Interests			(30)
Excess Tax Benefit on Stock Plans				0
Dividends Paid		(202)	(809)	(598)
Net Cash (Used in) Provided by Financing Activities		17,887	358,174	(1,264)
Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents		(4,266)	2,327	(1,213)
NET INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH		19,670	20,235	3,736
Cash, Cash Equivalents and Restricted Cash at Beginning of Year	40,075	40,075	19,840	16,104
CASH, CASH EQUIVALENTS, RESTRICTED CASH AND RESTRICTED CASH EQUIVALENTS AT END OF YEAR		59,745	40,075	19,840
Eliminations
OPERATING ACTIVITIES
Net Cash Provided by Operating Activities		(202)	(809)	(598)
INVESTING ACTIVITIES
Purchases of Property, Plant and Equipment		0	0	0
Proceeds from Disposals of Property, Plant and Equipment		0	0	0
Proceeds from Principal Payments Received on Long-Term Note Receivable		0	0
Proceeds from Sale of Business		0		0
Acquisitions of Businesses, Net of Cash Acquired			0	0
Issuance of Long-Term Note Receivable			0	0
Purchases of Intangible Asset		0	0
Change in Investments in Subsidiaries		15,622	199,028	19,594
Loan Proceeds Received by the Parent from Subsidiaries		(1,218)
Loan Proceeds Received by Subsidiaries from the Parent		(1,778)
Loan Borrowings (Payments) from Subsidiaries			164,763	(8,690)
Net Cash Used in Investing Activities		12,626	363,791	10,904
FINANCING ACTIVITIES
Proceeds from Short-Term Debt		0	0
Repayments of Debt from Subsidiaries to Parent		1,218
Repayments of Debt from the Parent to Subsidiaries		1,778
Repayments of Short-term Debt			0
Loan Borrowings (Payments) from Parent			(164,763)	8,690
Change in Subsidiary Equity		(15,622)	(199,028)	(19,594)
Proceeds from Issuance of Long-Term Debt		0	0	0
Payments of Long-Term Debt		0	0	0
Purchases of Common Stock				0
Payments of Debt Issuance Costs			0
Change in Capital Lease Obligations		0	0
Proceeds from Issuances of Common Stock		0	0	0
Payments to Noncontrolling Interests			0
Excess Tax Benefit on Stock Plans				0
Dividends Paid		202	809	598
Net Cash (Used in) Provided by Financing Activities		(12,424)	(362,982)	(10,306)
Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents		0	0	0
NET INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH		0	0	0
Cash, Cash Equivalents and Restricted Cash at Beginning of Year	$ 0	0	0	0
CASH, CASH EQUIVALENTS, RESTRICTED CASH AND RESTRICTED CASH EQUIVALENTS AT END OF YEAR		$ 0	$ 0	$ 0

Separate Financial Informatio_7

Separate Financial Information of Guarantor Subsidiaries Narrative (Details) - Bonds - USD ($)	Dec. 31, 2018	Apr. 18, 2017
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Face amount		$ 300,000,000
Interest rate, Stated percentage	5.625%	5.625%

Subsequent Events (Details)

Subsequent Events (Details)	Sep. 04, 2018
Gaomei [Member]
Subsequent Event [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired	100.00%
Anhui [Member]
Subsequent Event [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired	99.00%

Schedule II Valuation and Qua_2

Schedule II Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Valuation and Qualifying Accounts Disclosure
Balance at beginning of year		$ 3,241
Balance at end of year		2,516	$ 3,241
Allowance for Doubtful Accounts and Returns
Valuation and Qualifying Accounts Disclosure
Balance at beginning of year		2,428	2,570	$ 2,929
Charged to costs and expenses		375	1,183	649
Reclassification	[1]	772	(526)	0
Charged to other accounts	[2]	(222)	80	(4)
Deductions	[3]	(837)	(879)	(1,004)
Balance at end of year		2,516	2,428	2,570
Sales Returns and Allowances
Valuation and Qualifying Accounts Disclosure
Balance at beginning of year		813	538	686
Charged to costs and expenses		688	419	(88)
Charged to other accounts	[2]	10	31	(15)
Deductions	[3]	(198)	(175)	(45)
Balance at end of year		1,313	813	538
Inventory Reserves
Valuation and Qualifying Accounts Disclosure
Balance at beginning of year		4,107	3,644	3,540
Charged to costs and expenses		1,916	1,698	1,455
Charged to other accounts	[2]	(139)	183	(50)
Deductions	[4]	(246)	(1,418)	(1,301)
Balance at end of year		5,638	4,107	3,644
Valuation Allowance for Deferred Tax Assets
Valuation and Qualifying Accounts Disclosure
Balance at beginning of year		9,691	6,865	5,884
Charged to costs and expenses		2,373	1,634	1,295
Charged to other accounts	[2]	(545)	1,192	(314)
Balance at end of year		$ 11,519	$ 9,691	$ 6,865
[1]	Includes amount reclassified between Allowance for Doubtful Accounts and Other Receivables related to a customer's open receivables balance which was resolved in 2018, as well as acquisition-related adjustments.
[2]	Primarily includes impact from foreign currency fluctuations
[3]	Includes accounts determined to be uncollectible and charged against reserves, net of collections on accounts previously charged against reserves.
[4]	Includes inventory identified as excess, slow moving or obsolete and charged against reserves.