RB Global (RBA) 10-K 28 Feb 19 2018 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2018	Feb. 27, 2019	Jun. 30, 2018
Document And Entity Information [Abstract]
Entity Registrant Name	Ritchie Bros Auctioneers Inc
Entity Central Index Key	1,046,102
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-K
Document Period End Date	Dec. 31, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 3,686,199,341
Entity Common Stock, Shares Outstanding		108,727,400
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Small Business	false

Consolidated Income Statements

Consolidated Income Statements - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues:
Total revenues	$ 1,170,026	$ 971,191	$ 1,126,977
Operating expenses:
Selling, general and administrative expenses	382,676	323,270	283,529
Acquisition-related costs	5,093	38,272	11,829
Depreciation and amortization expenses	66,614	52,694	40,861
Gain on disposition of property, plant and equipment	(2,731)	(1,656)	(1,282)
Impairment loss		8,911	28,243
Foreign exchange (gain) loss	(212)	2,559	1,431
Total operating expenses	984,837	863,737	991,255
Operating income	185,189	107,454	135,722
Interest expense	(44,527)	(38,291)	(5,564)
Debt extinguishment costs			(6,787)
Other income, net	11,850	8,231	7,123
Income before income taxes	152,512	77,394	130,494
Current income tax	24,767	19,356	40,341
Deferred income tax	6,239	(17,268)	(3,359)
Income tax expense (recovery)	31,006	2,088	36,982
Net income	121,506	75,306	93,512
Net income attributable to:
Stockholders	121,479	75,027	91,832
Non-controlling interests	27	279	1,680
Net income	$ 121,506	$ 75,306	$ 93,512
Earnings per share attributable to stockholders:
Basic	$ 1.12	$ 0.70	$ 0.86
Diluted	$ 1.11	$ 0.69	$ 0.85
Weighted average number of shares outstanding:
Basic	108,063,349	107,044,348	106,630,323
Diluted	109,388,236	108,113,151	107,457,794
Service Revenues [Member]
Revenues:
Total revenues	$ 749,515	$ 624,417	$ 555,843
Operating expenses:
Direct expenses	159,058	133,189	113,296
Revenue from Inventory Sales [Member]
Revenues:
Total revenues	420,511	346,774	571,134
Operating expenses:
Direct expenses	$ 374,339	$ 306,498	$ 513,348

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 121,506	$ 75,306	$ 93,512
Other comprehensive income (loss), net of income tax:
Foreign currency translation adjustment	(13,792)	24,670	(9,847)
Total comprehensive income	107,714	99,976	83,665
Total comprehensive income attributable to:
Stockholders	107,716	99,639	81,839
Non-controlling interests	(2)	337	1,826
Total comprehensive income	$ 107,714	$ 99,976	$ 83,665

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Assets
Cash and cash equivalents	$ 237,744	$ 267,910
Restricted cash	67,823	63,206
Trade and other receivables	129,257	92,105
Inventory	113,294	38,238
Other current assets	49,055	27,610
Income taxes receivable	6,365	19,418
Total current assets	603,538	508,487
Property, plant and equipment	486,599	526,581
Other non-current assets	29,395	31,554
Intangible assets	245,622	261,094
Goodwill	671,594	670,922
Deferred tax assets	15,648	18,674
Total assets	2,052,396	2,017,312
Liabilities and Equity
Auction proceeds payable	203,503	199,245
Trade and other payables	201,255	164,553
Income taxes payable	2,312	732
Short-term debt	19,896	7,018
Current portion of long-term debt	13,126	16,907
Total current liabilities	440,092	388,455
Long-term debt	698,172	795,985
Other non-current liabilities	41,980	46,773
Deferred tax liabilities	35,519	32,334
Total liabilities	1,215,763	1,263,547
Commitments
Contingencies
Contingently redeemable performance share units	923	9,014
Share capital:
Common stock; no par value, unlimited shares authorized, issued and outstanding shares: 108,682,030 (December 31, 2017: 107,269,783)	181,780	138,582
Additional paid-in capital	56,885	41,005
Retained earnings	648,255	602,609
Accumulated other comprehensive loss	(56,277)	(42,514)
Stockholders' equity	830,643	739,682
Non-controlling interest	5,067	5,069
Total stockholders' equity	835,710	744,751
Total liabilities and equity	$ 2,052,396	$ 2,017,312

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Consolidated Balance Sheets [Abstract]
Common stock, no par value
Common stock, Shares Authorized, Unlimited	Unlimited	Unlimited
Common stock, issued shares	108,682,030	107,269,783
Common stock, outstanding shares	108,682,030	107,269,783

Consolidated Statements of Chan

Consolidated Statements of Changes in Equity - USD ($) $ in Thousands	Common stock [Member]	Additional paid-in capital ("APIC") [Member]	Retained earnings [Member]	Accumulated other comprehensive loss [Member]	Non-controlling interest ("NCI") [Member]	Non-controlling interest [Member]	Contingently redeemable non-controlling interest [Member]Contingently Redeemable Performance Share Units [Member]	Total
Balance at Dec. 31, 2015	$ 131,530	$ 27,728	$ 601,051	$ (57,133)	$ 4,183	$ 24,785		$ 707,359
Balance, shares at Dec. 31, 2015	107,200,470
Net income			91,832		346	1,334		92,178
Other comprehensive income (loss)				(9,993)	(23)	169		(10,016)
Comprehensive income			91,832	(9,993)	323	1,503		82,162
Change in value of contingently redeemable NCI			(21,186)			21,186		(21,186)
Stock option exercises	$ 30,670	(6,332)						24,338
Stock option exercises, shares	1,081,531
Stock option tax adjustment		443						443
Stock option compensation expense		5,507						5,507
Modification of PSUs			(70)				$ 2,175	(70)
Equity-classified PSU expense		283					1,698	283
Equity-classified PSU dividend equivalents		9	(62)				42	(53)
Change in value of contingently redeemable PSUs			(35)				35	(35)
NCI acquired in a business combination					596			596
Acquisition of NCI					(226)	(44,141)		(226)
Shares repurchased	$ (36,726)							$ (36,726)
Shares repurchased, shares	(1,460,000)							(1,460,000)
Cash dividends paid			(70,459)		(103)	(3,333)		$ (70,562)
Balance at Dec. 31, 2016	$ 125,474	27,638	601,071	(67,126)	4,773		3,950	691,830
Balance, shares at Dec. 31, 2016	106,822,001
Net income			75,027		279			75,306
Other comprehensive income (loss)				24,612	58			24,670
Comprehensive income			75,027	24,612	337			99,976
Stock option exercises	$ 13,017	(3,081)						9,936
Stock option exercises, shares	444,571
Stock option compensation expense		13,700						13,700
Assumption of stock options on acquisition of IronPlanet		2,330						2,330
Settlement of equity-classified PSUs	$ 91						(172)	91
Settlement of equity-classified PSUs, shares	3,211
Modification of PSUs			(382)				1,803	(382)
Equity-classified PSU expense		340					3,189	340
Equity-classified PSU dividend equivalents		78	(227)				149	(149)
Change in value of contingently redeemable PSUs			(95)				95	(95)
NCI acquired in a business combination
Acquisition of NCI
Shares repurchased, shares								0
Cash dividends paid			(72,785)		(41)			$ (72,826)
Balance at Dec. 31, 2017	$ 138,582	41,005	602,609	(42,514)	5,069		9,014	744,751
Balance, shares at Dec. 31, 2017	107,269,783
Contingently redeemable Performance share units, Balance at Dec. 31, 2017								9,014
Net income			121,479		27			121,506
Other comprehensive income (loss)				(13,763)	(29)			(13,792)
Comprehensive income			121,479	(13,763)	(2)			107,714
Stock option exercises	$ 37,308	(8,784)						28,524
Stock option exercises, shares	1,235,154
Issuance of common stock related to vesting of share units	$ 5,890	(1,662)	(326)				(7,803)	3,902
Issuance of common stock related to vesting of share units, shares	177,093
Stock option compensation expense		8,252						8,252
Modification of PSUs		12,365	958				(6,622)	13,323
Equity-classified PSU expense		5,384					5,872	5,384
Equity-classified PSU dividend equivalents		325	(678)				353	(353)
Change in value of contingently redeemable PSUs			(109)				109	(109)
Cash dividends paid			(75,678)					(75,678)
Balance at Dec. 31, 2018	$ 181,780	$ 56,885	$ 648,255	$ (56,277)	$ 5,067		$ 923	$ 835,710
Balance, shares at Dec. 31, 2018	108,682,030

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating activities:
Net income	$ 121,506,000	$ 75,306,000	$ 93,512,000
Adjustments for items not affecting cash:
Depreciation and amortization expenses	66,614,000	52,694,000	40,861,000
Impairment loss		8,911,000	28,243,000
Stock option compensation expense	8,252,000	13,700,000	5,507,000
Equity-classified PSU expense	11,256,000	3,529,000	1,981,000
Deferred income tax expense (recovery)	6,239,000	(17,268,000)	(3,359,000)
Unrealized foreign exchange loss	951,000	254,000	1,947,000
Gain on disposition of property, plant and equipment	(2,731,000)	(1,656,000)	(1,282,000)
Amortization of debt issuance costs	4,995,000	3,056,000	359,000
Gain on disposition of equity investment	(4,935,000)
Other, net	(2,317,000)	(1,237,000)	(893,000)
Net changes in operating assets and liabilities	(65,550,000)	10,279,000	10,682,000
Net cash provided by operating activities	144,280,000	147,568,000	177,558,000
Investing activities:
Acquisition of contingently redeemable NCI			(41,092,000)
Acquisition of NCI			(226,000)
Property, plant and equipment additions	(16,860,000)	(10,812,000)	(18,918,000)
Intangible asset additions	(26,152,000)	(28,584,000)	(17,558,000)
Proceeds on disposition of property, plant and equipment	10,586,000	4,985,000	6,691,000
Proceeds on disposal of equity investment	6,147,000
Other, net	(4,674,000)	(692,000)	(248,000)
Net cash used in investing activities	(30,953,000)	(710,954,000)	(116,862,000)
Financing activities:
Dividends paid to stockholders	(75,678,000)	(72,785,000)	(70,459,000)
Dividends paid to NCI		(41,000)	(3,436,000)
Issuances of share capital	28,524,000	9,936,000	24,338,000
Share repurchase			(36,726,000)
Payment of withholding taxes on issuance of shares	(3,901,000)
Proceeds from short-term debt	19,715,000	6,971,000	67,584,000
Repayment of short-term debt	(6,628,000)	(24,479,000)	(57,516,000)
Proceeds from long-term debt		325,000,000	647,091,000
Repayment of long-term debt	(91,013,000)	(108,985,000)	(148,158,000)
Debt issue costs		(12,624,000)	(10,644,000)
Debt extinguishment costs			(6,787,000)
Repayment of finance lease obligations	(3,950,000)	(2,322,000)	(1,655,000)
Other, net	(1,176,000)	(1,408,000)	511,000
Net cash provided by (used in) financing activities	(134,107,000)	119,263,000	404,143,000
Effect of changes in foreign currency rates on cash, cash equivalents, and restricted cash	(4,769,000)	17,150,000	4,000
Increase (decrease)	(25,549,000)	(426,973,000)	464,843,000
Beginning of period	331,116,000	758,089,000	293,246,000
Cash, cash equivalents, and restricted cash, end of period	$ 305,567,000	331,116,000	758,089,000
Iron Planet Holdings Inc. [Member]
Investing activities:
Acquisition, net of cash acquired		$ (675,851,000)
Mascus International Holdings BV [Member]
Investing activities:
Acquisition, net of cash acquired			(28,123,000)
Petrowsky Auctioneers Inc. [Member]
Investing activities:
Acquisition of equity investments			(6,250,000)
Kramer Auctions Ltd. [Member]
Investing activities:
Acquisition of equity investments			$ (11,138,000)

General Information

General Information	12 Months Ended
	Dec. 31, 2018
General Information [Abstract]
General Information	1. General information Ritchie Bros. Auctioneers Incorporated and its subsidiaries (collectively referred to as the “Company”) provide global asset management and disposition services, offering customers end-to-end solutions for buying and selling used industrial equipment and other durable assets through its unreserved live on site auctions, online marketplaces, listing services, and private brokerage services. Ritchie Bros. Auctioneers Incorporated is a company incorporated in Canada under the Canada Business Corporations Act, whose shares are publicly traded on the Toronto Stock Exchange (“TSX”) and the New York Stock Exchange (“NYSE”). 

Significant Accounting Policies

Significant Accounting Policies	12 Months Ended
	Dec. 31, 2018
Significant Accounting Policies [Abstract]
Significant Accounting Policies	2. Significant accounting policies (a) Basis of preparation These financial statements have been prepared in accordance with United States generally accepted accounting principles (“US GAAP”) and the following accounting policies have been consistently applied in the preparation of the consolidated financial statements .  (b) Basis of consolidation The consolidated financial statements include the accounts of the Company and its wholly-owned and non-wholly owned subsidiaries in which the Company has a controlling financial interest either through voting rights or means other than voting rights. All inter-company transactions and balances have been eliminated on consolidation. Where the Company’s ownership interest in a consolidated subsidiary is less than 100%, the non-controlling interests’ share of these non-wholly owned subsidiaries is reported in the Company’s consolidated balance sheets as a separate component of equity or within temporary equity. The non-controlling interests’ share of the net income of these non-wholly owned subsidiaries is reported in the Company’s consolidated income statements as a deduction from the Company’s net earnings to arrive at net income attributable to stockholders of the Company.  The Company consolidates variable interest entities (“VIEs”) if the Company has (a) the power to direct matters that most significantly impact the VIEs economic performance and (b) the obligation to absorb losses or the right to receive benefits of the VIE that could potentially be significant to the VIE. For VIEs where the Company has shared power with unrelated parties, the Company uses the equity method of accounting to report their results. The determination of the primary beneficiary involves judgment.  (c) Revenue recognition Effective January 1, 2018, the Company adopted ASU 2014-09, Revenue from Contracts with Customers (Topic 606) using the full retrospective method, which included restating prior years for comparative amounts. This new accounting policy resulted in a change in the financial statement presentation only on the income statement, as described in Note 2 ( y ) New and amended accounting standards in this Annual Report on Form 10-K.  Revenues are comprised of: · Service revenues, including the following: i. Revenue from auction and marketplace (“A&M”) activities, including commissions earned at our live auctions, online marketplaces, and private brokerage services where we act as an agent for consignors of equipment and other assets, and various auction-related fees, including listing and buyer transaction fees; and 2. Significant accounting policies (c) Revenue recognition (continued) ii. Other services revenues, including revenues from listing services, refurbishment, logistical services, financing, appraisal fees and other ancillary service fees; and · Revenue from inventory sales as part of A&M activities The Company recognizes revenue when control of the promised goods or services is transferred to our customers, or upon completion of the performance obligation, in an amount that reflects the consideration we expect to be entitled to in exchange for those goods or services. A performance obligation is a promise in a contract to transfer a distinct good or service to the customer. A contract’s transaction price is allocated to each distinct performance obligation and recognized as revenue when, or as, the performance obligation is satisfied. For live event-based auctions or online auctions, revenue is recognized when the auction sale is complete and the Company has determined that the sale proceeds are collectible. Revenue is measured at the fair value of the consideration received or receivable and is shown net of value-added tax and duties.  Service revenues Commissions from sales at the Company’s auctions represent the percentage earned by the Company on the gross proceeds from equipment and other assets sold at auction. The majority of the Company’s commissions are earned as a pre-negotiated fixed rate of the gross selling price. Other commissions from sales at the Company’s auctions are earned from underwritten commission contracts, when the Company guarantees a certain level of proceeds to a consignor.  The Company accepts equipment and other assets on consignment stimulating buyer interest through professional marketing techniques, and matches sellers (also known as consignors) to buyers through the auction or private sale process. Prior to offering an item for sale on its online marketplaces, the Company also performs inspections.  Following the sale of the item, the Company invoices the buyer for the purchase price of the asset, taxes, and, if applicable, the buyer transaction fee, collects payment from the buyer, and remits the proceeds to the seller, net of the seller commissions, applicable taxes, and applicable fees. Commissions are calculated as a percentage of the hammer price of the property sold at auction. Fees are also charged to sellers for listing and inspecting equipment. Other revenues earned in the process of conducting the Company’s auctions include administrative, documentation, and advertising fees.  On the fall of the auctioneer’s hammer, the highest bidder becomes legally obligated to pay the full purchase price, which is the hammer price of the property purchased and the seller is legally obligated to relinquish the property in exchange for the hammer price less any seller’s commissions. Commission and fee revenues are recognized on the date of the auction sale upon the fall of the auctioneer’s hammer.  Under the standard terms and conditions of its auction sales, the Company is not obligated to pay a consignor for property that has not been paid for by the buyer, provided the property has not been released to the buyer. If the buyer defaults on its payment obligation, also referred to as a collapsed sale, the sale is cancelled in the period in which the determination is made, and the property is returned to the consignor or placed in a later event-based or online auction. Historically cancelled sales have not been material.  Online marketplace commission revenue is reduced by a provision for disputes, which is an estimate of disputed items that are expected to be settled at a cost to the Company, related to settlements of discrepancies under the Company’s equipment condition certification program. The equipment condition certification refers to a written inspection report provided to potential buyers that reflects the condition of a specific piece of equipment offered for sale, and includes ratings, comments, and photographs of the equipment following inspection by one of the Company’s equipment inspectors.  2. Significant accounting policies (c) Revenue recognition (continued) Service revenues (continued) The equipment condition certification provides that a buyer may file a written dispute claim during an eligible dispute period for consideration and resolution at the sole determination of the Company if the purchased equipment is not substantially in the condition represented in the inspection report. Typically disputes under the equipment condition certification program are settled with minor repairs or additional services, such as washing or detailing the item; the estimated costs of such items or services are included in the provision for disputes.  Commission revenues are recorded net of commissions owed to third parties, which are principally the result of situations when the commission is shared with a consignor or with the counterparty in an auction guarantee risk and reward sharing arrangement. Additionally, in certain situations, commissions are shared with third parties who introduce the Company to consignors who sell property at auction.  Underwritten commission contracts can take the form of guarantee contracts. Guarantee contracts typically include a pre-negotiated percentage of the guaranteed gross proceeds plus a percentage of proceeds in excess of the guaranteed amount. If actual auction proceeds are less than the guaranteed amount, commission is reduced; if proceeds are sufficiently lower, the Company can incur a loss on the sale. Losses, if any, resulting from guarantee contracts are recorded in the period in which the relevant auction is completed. If a loss relating to a guarantee contract held at the period end to be sold after the period end is known or is probable and estimable at the financial statement reporting date, the loss is accrued in the financial statements for that period. The Company’s exposure from these guarantee contracts fluctuates over time.  Other services revenue also includes fees for refurbishment, logistical services, financing, appraisal fees and other ancillary service fees. Fees are recognized in the period in which the service is provided to the customer.  Revenue on inventory sales Underwritten commission contracts can take the form of inventory contracts. Revenues related to inventory contracts are recognized in the period in which the sale is completed, title to the property passes to the purchaser and the Company has fulfilled any other obligations that may be relevant to the transaction. In its role as auctioneer, the Company auctions its inventory to equipment buyers through the auction process. Following the sale of the item, the Company invoices the buyer for the purchase price of the asset, taxes, and, if applicable, the buyer transaction fee, and collects payment from the buyer. On the fall of the auctioneer’s hammer, the highest bidder becomes legally obligated to pay the full purchase price, which is the hammer price of the property purchased. Title to the property is transferred in exchange for the hammer price, and if applicable, the buyer transaction fee plus applicable taxes.  (d) Costs of services Costs of services are comprised of expenses incurred in direct relation to conducting auctions (“direct expenses”), earning online marketplace revenues, and earning other fee revenues. Direct expenses include direct labour, buildings and facilities charges, and travel, advertising and promotion costs.  Costs of services incurred to earn online marketplace revenues in addition to the costs listed above also include inspection costs. Inspections are generally performed at the seller’s physical location. The cost of inspections includes payroll costs and related benefits for the Company’s employees that perform and manage field inspection services, the related inspection report preparation and quality assurance costs, fees paid to contractors who perform field inspections, related travel and incidental costs for the Company’s inspection service organization, and office and occupancy costs for its inspection services personnel. Costs of earning online marketplace revenues also include costs for the Company’s customer support, online marketplace operations, logistics, title and lien investigation functions.  2. Significant accounting policies (continued) (d) Costs of services (continued) Costs of services incurred in earning other fee revenues include ancillary and logistical service expenses, direct labour (including commissions on sales), software maintenance fees, and materials. Costs of services exclude depreciation and amortization expenses.  (e) Cost of inventory sold Cost of inventory sold includes the purchase price of assets sold for the Company’s own account and is determined using a specific identification basis.  (f) Share-based payments The Company classifies a share-based payment award as an equity or liability payment based on the substantive terms of the award and any related arrangement.  Equity-classified share-based payments Share unit plans The Company has a senior executive performance share unit (“PSU”) plan and an employee PSU plan that provides for the award of PSUs to certain senior executives and employees, respectively, of the Company. The Company has the option to settle certain share unit awards in cash or shares and expects to settle them in shares. The cost of PSUs granted is measured at the fair value of the underlying PSUs at the grant date using a Monte-Carlo simulation model. PSUs vest based on the passage of time and achievement of performance criteria.  The Company also has a senior executive restricted share unit (“RSU”) plan and an employee RSU plan that provides for the award of RSUs to certain senior executives and employees, respectively, of the Company. The Company has the option to settle certain share unit awards in cash or shares and expects to settle all grants on and after 2017 in shares. The cost of RSUs granted is measured using the volume weighted average price of the Company’s common shares for the twenty days prior to the grant date. RSUs vest based on the passage of time and include restrictions related to employment.  This fair value of awards expected to vest under these plans is expensed over the respective remaining service period of the individual awards, on an accelerated recognition basis, with the corresponding increase to APIC recorded in equity. At the end of each reporting period, the Company revises its estimate of the number of equity instruments expected to vest. The impact of the revision of the original estimates, if any, is recognized in earnings, such that the consolidated expense reflects the revised estimate, with a corresponding adjustment to equity. Dividend equivalents on the equity-classified PSUs and RSUs are recognized as a reduction to retained earnings over the service period.  At its August 2018 meeting, the Board of Directors resolved that, with respect to each of the RSU and PSU plans, there will no longer be a default in favour of cash settlement and, pursuant to the discretion granted under each plan, the Compensation Committee of the Board will determine whether to settle the awards in cash or in shares in the event of death of the participant. The Company intends to settle in shares. Prior to such resolution, the RSUs and PSUs awarded under the senior executive and employee PSU plans were intended to be settled in cash in the event of death of the participant, and as such, the contingently redeemable portion representing the amount that would be redeemable based on the conditions at the date of grant, to the extent attributable to prior service, was recognized as temporary equity. As a result of the resolution, that portion has been reclassified to additional paid in capital during the year. 2. Significant accounting policies (continued) (f) Share-based payments (continued) Stock option plans The Company has three stock option compensation plans that provide for the award of stock options to selected employees, directors and officers of the Company. The cost of options granted is measured at the fair value of the underlying option at the grant date using the Black-Scholes option pricing model. The fair value of options expected to vest under these plans is expensed over the respective remaining service period of the individual awards, on an accelerated recognition basis, with the corresponding increase to APIC recorded in equity. Upon exercise, any consideration paid on exercise of the stock options and amounts fully amortized in APIC are credited to the common shares.  Liability-classified share-based payments The Company maintains other share unit compensation plans that vest over a period of up to three years after grant. Under those plans, the Company is either required or expects to settle vested awards on a cash basis or by providing cash to acquire shares on the open market on the employee’s behalf, where the settlement amount is determined using the volume weighted average price of the Company’s common shares for the twenty days prior to the vesting date or, in the case of deferred share unit (“DSU”) recipients, following cessation of service on the Board of Directors.  These awards are classified as liability awards, measured at fair value at the date of grant and re-measured at fair value at each reporting date up to and including the settlement date. The determination of the fair value of the share units under these plans is described in note 25. The fair value of the awards is expensed over the respective vesting period of the individual awards with recognition of a corresponding liability. Changes in fair value after vesting are recognized through compensation expense. Compensation expense reflects estimates of the number of instruments expected to vest.  The impact of forfeitures and fair value revisions, if any, are recognized in earnings such that the cumulative expense reflects the revisions, with a corresponding adjustment to the settlement liability. Liability-classified share unit liabilities due within 12 months of the reporting date are presented in trade and other payables while settlements due beyond 12 months of the reporting date are presented in other non-current liabilities.  (g) Fair value measurement Fair value is the exit price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. The Company measures financial instruments or discloses select non-financial assets at fair value at each balance sheet date. Also, fair values of financial instruments measured at amortized cost are disclosed in note 13.  The Company uses valuation techniques that are appropriate in the circumstances and for which sufficient data is available to measure fair value, maximizing the use of relevant observable inputs and minimizing the use of unobservable inputs.  All assets and liabilities for which fair value is measured or disclosed in the financial statements at fair value are categorized within a fair value hierarchy, as disclosed in note 13, based on the lowest level input that is significant to the fair value measurement or disclosure. This fair value hierarchy gives the highest priority to quoted prices in active markets for identical assets or liabilities (Level 1) and the lowest priority to unobservable inputs (Level 3).  For assets and liabilities that are recognized in the financial statements at fair value on a recurring basis, the Company determines whether transfers have occurred between levels in the hierarchy by re-assessing categorization at the end of each reporting period.    2. Significant accounting policies (continued) (g) Fair value measurement (continued) For the purposes of fair value disclosures, the Company has determined classes of assets and liabilities on the basis of the nature, characteristics and risks of the assets or liability and the level of the fair value hierarchy as explained above.  (h) Foreign currency translation The parent entity‘s presentation and functional currency is the United States dollar. The functional currency for each of the parent entity‘s subsidiaries is the currency of the primary economic environment in which the entity operates, which is usually the currency of the country of residency.  Accordingly, the financial statements of the Company‘s subsidiaries that are not denominated in United States dollars have been translated into United States dollars using the exchange rate at the end of each reporting period for asset and liability amounts and the monthly average exchange rate for amounts included in the determination of earnings. Any gains or losses from the translation of asset and liability amounts are included in foreign currency translation adjustment in accumulated other comprehensive income.  In preparing the financial statements of the individual subsidiaries, transactions in currencies other than the entity‘s functional currency are recognized at the rates of exchange prevailing at the dates of the transaction. At the end of each reporting period, monetary assets and liabilities denominated in foreign currencies are retranslated at the rates prevailing at that date. Foreign currency differences arising on retranslation of monetary items are recognized in earnings. Foreign currency translation adjustment includes intra-entity foreign currency transactions that are of a long-term investment nature of $9,602,000 for 2018 (2017: $18,129,000 ; 2016: $1,967,000 ).  (i) Cash and cash equivalents Cash and cash equivalents is comprised of cash on hand, deposits with financial institutions, and other short-term, highly liquid investments with original maturity of three months or less when acquired, that are readily convertible to known amounts of cash.  (j) Restricted cash In certain jurisdictions, local laws require the Company to hold cash in segregated bank accounts, which are used to settle auction proceeds payable resulting from live on site auctions and online marketplace sales conducted in those regions. In addition, the Company also holds cash generated from its online marketplace sales in separate escrow accounts, for settlement of the respective online marketplace transactions as a part of its secured escrow service. Restricted cash balances also include funds held in accounts owned by the Company in support of short-term stand-by letters of credit to provide seller security.  During the period from December 21, 2016 through May 31, 2017, non-current restricted cash consisted of funds held in escrow pursuant to the offering of senior unsecured notes (note 22), which were only available when the Company received approval to acquire IronPlanet Holdings, Inc. (“IronPlanet”) and whose use was restricted to the funding of the IronPlanet acquisition (note 29).  (k) Trade and other receivables Trade receivables principally include amounts due from customers as a result of live on site auction and online marketplace transactions. The recorded amount reflects the purchase price of the item sold, including the Company’s commission. The allowance for doubtful accounts is the Company’s best estimate of the amount of probable credit losses in existing accounts receivable. The Company determines the allowance based on historical write-off experience and customer economic data. The Company reviews the allowance for doubtful accounts regularly and past due balances are reviewed for collectability. Account balances are charged against the allowance when the Company believes that the receivable will not be recovered. 2. Significant accounting policies (continued) (l) Inventories Inventory consists of equipment and other assets purchased for resale in an upcoming live on site auction or online marketplace event. The Company typically purchases inventory for resale through a competitive process where the consignor or vendor has determined this to be the preferred method of disposition through the auction process. In addition, certain jurisdictions require auctioneers to hold title to assets and facilitate title transfer on sale. Inventory is valued at the lower of cost and net realizable value where net realizable value represents the expected sale price upon disposition less make-ready costs and the costs of disposal and transportation. As part of its government business, the Company purchases inventory for resale as part of its commitment to purchase certain surplus government property (note 26). The significant elements of cost include the acquisition price of the inventory and make-ready costs to prepare the inventory for sale that are not selling expenses and in-bound transportation costs. Write-downs to the carrying value of inventory are recorded in cost of inventory sold on the consolidated income statement. (m) Equity-accounted investments Investments in entities that the Company has the ability to exercise significant influence over, but not control, are accounted for using the equity method of accounting. Under the equity method of accounting, investments are stated at initial costs and are adjusted for subsequent additional investments and the Company’s share of earnings or losses and distributions. The Company evaluates its equity-accounted investments for impairment when events or circumstances indicate that the carrying value of such investments may have experienced an other-than-temporary decline in value below their carrying value. If the estimated fair value is less than the carrying value and is considered an other than temporary decline, the carrying value is written down to its estimated fair value and the resulting impairment is recorded in the consolidated income statement.  (n) Property, plant and equipment All property, plant and equipment are stated at cost less accumulated depreciation. Cost includes all expenditures that are directly attributable to the acquisition or development of the asset, net of any amounts received in relation to those assets, including scientific research and experimental development tax credits.  The cost of self-constructed assets includes the cost of materials and direct labour, any other costs directly attributable to bringing the assets to working condition for their intended use, the costs of dismantling and removing items and restoring the site on which they are located (if applicable), and capitalized interest on qualifying assets. Subsequent costs are included in the asset’s carrying amount or recognized as a separate asset, as appropriate, only when it is probable that future economic benefits associated with the item will flow to the Company and the cost of the item can be measured reliably.  All repairs and maintenance costs are charged to earnings during the financial period in which they are incurred. Gains and losses on disposal of an item of property, plant and equipment are determined by comparing the proceeds from disposal with the carrying amount of the item, and are recognized net within operating income on the income statement.  Depreciation is provided to charge the cost of the assets to operations over their estimated useful lives based on their usage as follows:   Asset Rate / term  Land improvements 10% Buildings 15 - 30 years Yard equipment 20 - 30%  Automotive equipment 30% Computer software and equipment 3 - 5 years  Office equipment 20% Leasehold improvements Lease term 2. Significant accounting policies (continued) (n) Property, plant and equipment (continued) No depreciation is provided on freehold land or on assets in the course of construction or development. Depreciation of property, plant and equipment under capital leases is recorded in depreciation expense.  Legal obligations to retire and to restore property, plant and equipment and assets under operating leases are recorded at management‘s best estimate in the period in which they are incurred, if a reasonable estimate can be made, with a corresponding increase in asset carrying value. The liability is accreted to face value over the remaining estimated useful life of the asset. The Company does not have any significant asset retirement obligations.  (o) Long-lived assets held for sale Long-lived assets, or disposal groups comprising assets and liabilities, that are expected to be recovered primarily through sale rather than through continuing use are classified as assets held for sale. Immediately before classification as held for sale, the assets, or components of a disposal group, are measured at carrying amount in accordance with the Company’s accounting policies. Thereafter, the assets, or disposal group, are measured at the lower of their carrying amount and fair value less cost to sell and are not depreciated. Impairment losses on initial classification as held for sale and subsequent gains or losses on re-measurement are recognized in operating income on the income statement.  (p) Intangible assets Intangible assets are measured at cost less accumulated amortization and accumulated impairment losses. Cost includes all expenditures that are directly attributable to the acquisition or development of the asset, net of any amounts received in relation to those assets, including scientific research and experimental development tax credits. Costs of internally developed software are amortized on a straight-line basis over the remaining estimated economic life of the software product. Costs related to software incurred prior to establishing technological feasibility or the beginning of the application development stage of software are charged to operations as such costs are incurred. Once technological feasibility is established or the application development stage has begun, directly attributable costs are capitalized until the software is available for use.  Amortization is recognized in net earnings on a straight-line basis over the estimated useful lives of intangible assets from the date that they are available for use. The estimated useful lives are:    Asset Basis Rate / term  Trade names and trademarks Straight-line 3 - 15 years or indefinite-lived  Customer relationships Straight-line 6 - 20 years  Software assets Straight-line 3 - 7 years  Customer relationships includes relationships with buyers and sellers.  (q) Impairment of long-lived and indefinite-lived assets Long-lived assets, comprised of property, plant and equipment and intangible assets subject to amortization, are assessed for impairment whenever events or circumstances indicate that their carrying value may not be recoverable. For the purpose of impairment testing, long-lived assets are grouped and tested for recoverability at the lowest level that generates independent cash flows. An impairment loss is recognized when the carrying value of the assets or asset groups is greater than the future projected undiscounted cash flows. The impairment loss is calculated as the excess of the carrying value over the fair value of the asset or asset group. Fair value is based on valuation techniques or third party appraisals. Significant estimates and judgments are applied in determining these cash flows and fair values. 2. Significant accounting policies (continued) (q) Impairment of long-lived and indefinite-lived assets (continued) Indefinite-lived intangible assets are tested annually for impairment as of December 31, and between annual tests if indicators of potential impairment exist. The Company has the option of performing a qualitative assessment to first determine whether the quantitative impairment test is necessary. This involves an assessment of qualitative factors to determine the existence of events or circumstances that would indicate whether it is more likely than not that the carrying amount of the indefinite-lived intangible asset is less than its fair value. If the qualitative assessment indicates it is not more likely than not that the carrying amount is less than its fair value, a quantitative impairment test is not required. Where a quantitative impairment test is required, the procedure is to compare the indefinite-lived intangible asset’s fair value with its carrying amount. An impairment loss is recognized as the difference between the indefinite-lived intangible asset’s carrying amount and its fair value. (r) Goodwill Goodwill represents the excess of the purchase price of an acquired enterprise over the fair value assigned to the assets acquired and liabilities assumed in a business combination.  Goodwill is not amortized, but it is tested annually for impairment at the reporting unit level as of December 31, and between annual tests if indicators of potential impairment exist. The Company has the option of performing a qualitative assessment of a reporting unit to first determine whether the quantitative impairment test is necessary. This involves an assessment of qualitative factors to determine the existence of events or circumstances that would indicate whether it is more likely than not that the carrying amount of the reporting unit to which goodwill belongs is less than its fair value. If the qualitative assessment indicates it is not more likely than not that the reporting unit’s carrying amount is less than its fair value, a quantitative impairment test is not required. If a quantitative impairment test is required, the procedure is to identify potential impairment by comparing the reporting unit’s fair value with its carrying amount, including goodwill. The reporting unit’s fair value is determined using various valuation approaches and techniques that involve assumptions based on what the Company believes a hypothetical marketplace participant would use in estimating fair value on the measurement date. An impairment loss is recognized as the difference between the reporting unit’s carrying amount and its fair value. If the difference between the reporting unit’s carrying amount and fair value is greater than the amount of goodwill allocated to the reporting unit, the i

Significant Judgments, Estimate

Significant Judgments, Estimates and Assumptions	12 Months Ended
	Dec. 31, 2018
Significant Judgments, Estimates and Assumptions [Abstract]
Significant Judgments, Estimates and Assumptions	3. Significant judgments, estimates and assumptions The preparation of financial statements in conformity with US GAAP requires management to make judgments, estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period.  Future differences arising between actual results and the judgments, estimates and assumptions made by the Company at the reporting date, or future changes to estimates and assumptions, could necessitate adjustments to the underlying reported amounts of assets, liabilities, revenues and expenses in future reporting periods.  Judgments, estimates and underlying assumptions are evaluated on an ongoing basis by management, and are based on historical experience and other factors including expectations of future events that are believed to be reasonable under the circumstances. However, existing circumstances and assumptions about future developments may change due to market changes or circumstance and such changes are reflected in the assumptions when they occur. Significant items subject to estimates include purchase price allocations, the carrying amounts of goodwill, the useful lives of long-lived assets, share based compensation, deferred income taxes, reserves for tax uncertainties, and other contingencies.

Segmented Information

Segmented Information	12 Months Ended
	Dec. 31, 2018
Segmented Information [Abstract]
Segmented Information	4. Segmented information The Company’s principal business activity is the management and disposition of used industrial equipment and other durable assets. The Company’s operations are comprised of one reportable segment and other business activities that are not reportable as follows: · Auctions and Marketplaces – This is the Company’s only reportable segment, which consists of the Company’s live on site auctions, its online auctions and marketplaces, and its brokerage service; · Other includes the results of Ritchie Bros. Financial Services (“RBFS”), Mascus online services, and the results from various value-added services and make-ready activities, including the Company’s equipment refurbishment services, Asset Appraisal Services, and Ritchie Bros. Logistical Services. 4. Segmented information (continued)    Year ended December 31, 2018  A&M Other Consolidated  Service revenues $ 626,007 $ 123,508 $ 749,515  Revenue from inventory sales 420,511 - 420,511  Total revenues $ 1,046,518 $ 123,508 $ 1,170,026  Costs of services 87,430 71,628 159,058  Cost of inventory sold 374,339 - 374,339  Selling, general and administrative  expenses ("SG&A") 363,549 19,127 382,676  Segment profit $ 221,200 $ 32,753 $ 253,953  Acquisition-related costs 5,093  Depreciation and amortization  expenses ("D&A") 66,614  Gain on disposition of property, plant  and equipment ("PPE") (2,731)  Foreign exchange gain (212)  Operating income $ $ $ 185,189  Interest expense (44,527)  Other income, net 11,850  Income tax expense (31,006)  Net income $ $ $ 121,506 4. Segmented information (continued)    Year ended December 31, 2017  A&M Other Consolidated  Service revenues $ 524,023 $ 100,394 $ 624,417  Revenue from inventory sales 346,774 - 346,774  Total revenues $ 870,797 $ 100,394 971,191  Costs of services 75,685 57,504 133,189  Cost of inventory sold 306,498 - 306,498  SG&A expenses 308,873 14,397 323,270  Impairment loss 8,911 - 8,911  Segment profit $ 170,830 $ 28,493 $ 199,323  Acquisition-related costs 38,272  D&A expenses 52,694  Gain on disposition of PPE (1,656)  Foreign exchange loss 2,559  Operating income $ 107,454  Interest expense (38,291)  Other income, net 8,231  Income tax expense (2,088)  Net income $ 75,306 4. Segmented information (continued)    Year ended December 31, 2016  A&M Other Consolidated  Service revenues $ 474,040 81,803 $ 555,843  Revenue from inventory sales 571,134 - 571,134  Total revenues $ 1,045,174 $ 81,803 1,126,977  Costs of services 65,248 48,048 113,296  Cost of inventory sold 513,348 - 513,348  SG&A expenses 272,317 11,212 283,529  Impairment loss 28,243 - 28,243  Segment profit $ 166,018 $ 22,543 $ 188,561  Acquisition-related costs 11,829  D&A expenses 40,861  Gain on disposition of PPE (1,282)  Foreign exchange loss 1,431  Operating income $ 135,722  Interest expense (5,564)  Debt extinguishment costs (6,787)  Other income, net 7,123  Income tax expense (36,982)  Net income $ 93,512              4. Segmented information (continued) The carrying value of goodwill of $651,359,000 has been allocated to A&M and $20,235,000 has been allocated to other. As in prior periods, the CODM does not evaluate the performance of its operating segments based on segment assets and liabilities, nor does the Company classify liabilities on a segmented basis.     As at December 31, 2018 2017  A&M $ 651,359 $ 649,770  Other 20,235 21,152  $ 671,594 $ 670,922  The Company‘s geographic information as determined by the revenue and location of assets, which represents property, plant and equipment is as follows:     United States Canada Europe Other Consolidated  Total revenues for the year ended:  December 31, 2018 $ 548,695 $ 284,989 $ 180,817 $ 155,525 $ 1,170,026  December 31, 2017 452,599 245,106 127,706 145,780 971,191  December 31, 2016 555,837 293,956 109,024 168,160 1,126,977     United States Canada Europe Other Consolidated  Long-lived assets:  December 31, 2018 $ 260,489 $ 100,983 $ 77,496 $ 47,631 $ 486,599  December 31, 2017 275,628 116,833 82,795 51,325 526,581     

Revenues

Revenues	12 Months Ended
	Dec. 31, 2018
Revenues [Abstract]
Revenues	5. Revenues The Company’s revenue from the rendering of services is as follows:    Year ended December 31, 2018 2017 2016  Service revenues:  Commissions $ 420,160 $ 394,397 $ 366,342  Fees 329,355 230,020 189,501  749,515 624,417 555,843  Revenue from inventory sales 420,511 346,774 571,134  $ 1,170,026 $ 971,191 $ 1,126,977

Operating Expenses

Operating Expenses	12 Months Ended
	Dec. 31, 2018
Operating Expenses [Abstract]
Operating Expenses	6. Operating expenses Costs of services    Year ended December 31, 2018 2017 2016  Ancillary and logistical service expenses $ 66,576 $ 54,176 $ 47,234  Employee compensation expenses 41,391 35,440 27,856  Buildings, facilities and technology expenses 9,477 8,359 7,966  Travel, advertising and promotion expenses 27,606 23,994 23,688  Other costs of services 14,008 11,220 6,552  $ 159,058 $ 133,189 $ 113,296  SG&A expenses    Year ended December 31, 2018 2017 2016  Employee compensation expenses $ 249,115 $ 208,370 $ 180,929  Buildings, facilities and technology expenses 60,930 53,151 49,219  Travel, advertising and promotion expenses 36,728 30,440 24,384  Professional fees 16,768 13,522 13,344  Other SG&A expenses 19,135 17,787 15,653  $ 382,676 $ 323,270 $ 283,529  Acquisition-related costs Acquisition-related costs consist of operating expenses directly incurred as part of a business combination, due diligence and integration planning related to the IronPlanet acquisition (note 29), and continuing employment costs that are recognized separately from our business combinations.    Year ended December 31, 2018 2017 2016  IronPlanet:  Other acquisition-related costs $ 2,944 $ 34,653 $ 8,202  Other acquisitions:  Continuing employment costs 2,091 3,418 2,491  Other acquisition-related costs 58 201 1,136  $ 5,093 $ 38,272 $ 11,829  Depreciation and amortization expenses    Year ended December 31, 2018 2017 2016  Depreciation expense $ 29,021 $ 28,337 $ 30,983  Amortization expense 37,593 24,357 9,878  $ 66,614 $ 52,694 $ 40,861  During the year ended December 31, 2018, depreciation expense of $494,000 (2017 : $ 1,207,000 ; 2016: $2,880,000 ) and amortization expense of $18,996,000 (2017 : $11,662,000 ; 2016: $7,218,000 ) were recorded relating to software. 

Impairment Loss

Impairment Loss	12 Months Ended
	Dec. 31, 2018
Impairment Loss [Abstract]
Impairment Loss	 7. Impairment Loss Goodwill impairment The Company performs impairment tests on goodwill on an annual basis in accordance with US GAAP, or more frequently if events or changes in circumstances indicate that those assets might be impaired. Goodwill is tested for impairment at a reporting unit level, which is at the same level or one level below an operating segment. A goodwill impairment loss is recognized when the carrying amount of the reporting unit is greater than its fair value. The goodwill impairment loss is calculated as the excess of the carrying amount of the goodwill over its implied fair value. During the years ended December 31, 2018 and 2017 , there was no goodwill impairment identified.  Goodwill arising from the acquisition of AssetNation, the provider of an online marketplace, was part of the former EquipmentOne reporting unit. During the year ended December 31, 2016, an indicator of impairment was identified with respect to the EquipmentOne reporting unit. The indicator consisted of a decline in actual and forecasted revenue and operating income compared with previously projected results, which was primarily due to the recent performance of the EquipmentOne reporting unit.  Based on the results of the goodwill impairment test, the Company recorded an impairment loss on the EquipmentOne reporting unit goodwill of $23,574,000 in the year ended December 31, 2016.  Long-lived asset impairment Long-lived assets, which are comprised of property, plant and equipment and definite-lived intangible assets, are assessed for impairment whenever events or circumstances indicate that their carrying amounts may not be recoverable. For the purpose of impairment testing, long-lived assets are grouped and tested for recoverability at the lowest level that generates independent cash flows from another asset group. The carrying amount of the long-lived asset group is not recoverable if it exceeds the sum of the future undiscounted cash flows expected to result from the long-lived asset group’s use and eventual disposition. Where the carrying amount of the long-lived asset group is not recoverable, its fair value is determined in order to calculate any impairment loss. An impairment loss is measured as the excess of the long-lived asset group’s carrying amount over its fair value.  During the year ended December 31, 2017, management identified indicators of impairment on certain software and software under development intangible assets (the “technology assets”). The indicators consisted of decisions made after the acquisition of IronPlanet that adversely impacted the extent or manner in which certain technology assets would be utilized. As part of its integration activities the Company determined that it was more likely than not that certain technology assets would not be utilized or developed as originally intended and no longer had value. As a result, management performed an impairment test that resulted in the recognition of an impairment loss of $8,911,000 on the technology assets.  At September 30, 2016, for the same reason noted above under the EquipmentOne goodwill impairment test, management determined that there was an indicator that the carrying amount of the long-lived assets arising from our acquisition of AssetNation (the “EquipmentOne long-lived assets”) might not have been recoverable. As such, the Company performed the recoverability test, for which purpose management determined that the asset group to which the EquipmentOne long-lived assets belonged was the EquipmentOne reporting unit.  Based on the results of the long-lived asset impairment test, the Company recorded an impairment loss on the EquipmentOne reporting unit customer relationships of $4,669,000 in the year ended December 31, 2016. In connection with this impairment loss, the Company recorded a deferred tax benefit of $1,798,000 to the income tax provision. The result of this impairment test was reflected in the carrying value of the former EquipmentOne reporting unit prior to the completion of the goodwill impairment test described above. 

Other Income

Other Income	12 Months Ended
	Dec. 31, 2018
Other Income [Abstract]
Other Income	8. Other income Included in other income is a gain of $4,935,000 recognized on the disposition of one of the Company’s equity accounted for investments. The Company received net proceeds of $6,147,000 on closing and is entitled to receive up to $1,020,000 upon the satisfaction of certain escrow release conditions over a period of five years. Additionally, the Company is entitled to receive up to $1,700,000 of contingent consideration upon the achievement of certain financial targets for the period from January 1, 2019 to December 31, 2019. The Company has not recognized any contingent consideration. 

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2018
Income Taxes [Abstract]
Income Taxes	9. Income taxes The expense for the year can be reconciled to income before income taxes as follows:    Year ended December 31, 2018 2017 2016  Income before income taxes $ 152,512 $ 77,394 $ 130,494  Statutory federal and provincial tax  rate in Canada 27.00% 26.00% 26.00%   Expected income tax expense $ 41,178 $ 20,122 $ 33,928   Non-deductible expenses 4,810 5,668 3,891  Adjustment to prior year provision to statutory  tax returns 1,323 (528) (824)  Changes in the valuation of deferred tax assets (771) (1,089) (259)  Different tax rates of subsidiaries  operating in foreign jurisdictions (17,145) (12,269) (3,786)  U.S. tax reform impacts 4,899 (9,734) -  Impairment of goodwill - - 6,129  Change in estimate of deductibility  of stock options - (1,557) -  Unrecognized tax benefits (1,800) 3,291 799  Benefits of deductible stock options vested  and exercised (2,434) (1,359) (1,042)  Deductions for tax purposes in excess of  accounting expenses (383) (380) (490)  Other 1,329 (77) (1,364)  $ 31,006 $ 2,088 $ 36,982  9. Income taxes (continued) The income tax expense (recovery) consists of:    Year ended December 31, 2018 2017 2016  Canadian:  Current tax expense $ 13,209 30,525 $ 14,245 $ 30,525  Deferred tax expense (recovery) 3,958 (10,192) (2,068)   Foreign:  Current tax expense before application  of operating loss carryforwards 19,851 8,987 12,126  Tax benefit of operating loss carryforwards (8,293) (3,876) (2,310)  Total foreign current tax expense 11,558 5,111 9,816   Deferred tax expense before adjustment  to opening valuation allowance 2,386 (6,317) (1,291)  Adjustment to opening valuation allowance (105) (759) -  Total foreign deferred tax expense (recovery) 2,281 (7,076) (1,291)  $ 31,006 $ 2,088 $ 36,982  The foreign provision for income taxes is based on foreign pre-tax earnings of $102,824,000, $64,252,000 , and $25,139,000 in 2018, 2017, and 2016, respectively. The Company’s consolidated financial statements provide for any related tax liability on undistributed earnings. As of December 31, 2018, income taxes have not been provided on a cumulative total of $484,510,000 of such earnings. The amount of unrecognized deferred tax liability related to these temporary differences is estimated to be approximately $8,799,000 . Earnings retained by subsidiaries and equity-accounted investments amount to approximately $484,510,000 in 2018 (2017: $469,000,000 ; 2016: $450,000,000 ). The Company accrues withholding and other taxes that would become payable on the distribution of earnings only to the extent that either the Company does not control the relevant entity or it is expected that these earnings will be remitted in the foreseeable future.  Recent Tax Legislation On December 22, 2017, the T ax Cuts and Jobs Act (the “ TCJA ”) was enacted into law, which significantly changed existing U.S. tax law and included numerous provisions that affected our business, such as imposing a one-time transition tax on deemed repatriation of deferred foreign income, reducing the U.S. federal statutory tax rate limiting the deductibility of interest and executive compensation, creating new minimum taxes such as the Base Erosion Anti-Abuse Tax (“BEAT”) and Global Low Taxed Income (“GILTI”) tax , and adopting a territorial tax system.  In 2017, we recorded provisional amounts for certain enactment-date effects of the TCJA by applying the guidance in SAB 118 which was issued to address the application of U.S. GAAP in situations when a registrant did not have the necessary information available, prepared, or analyzed (including computations) in reasonable detail to complete the accounting for certain income tax effects of the TCJA . In accordance with the TCJA , we recorded $9,734,000 as additional income tax benefit in the fourth quarter of 2017, the period in which the legislation was enacted. The total benefit included $10,070,000 related to the remeasurement of certain deferred tax assets and liabilities and $336,000 expense related to the transition tax.  December 22, 2018 marked the end of the measurement period for purposes of SAB 118. As such, we have completed our analysis based on legislative updates relating to the TCJA currently available which resulted in tax expense of $203,000 in the fourth quarter of 2018. The computations which have now been determined to be complete, resulted in a $10,017,000 total benefit related to the remeasurement of certain deferred tax assets and liabilities and a total t ransition t ax obligation of $486,000 . We elected to account for GILTI as a current-period expense when incurred. 9. Income taxes (continued) The tax effects of temporary differences that give rise to significant deferred tax assets and deferred tax liabilities were as follows:    As at December 31, 2018 2017  Deferred tax assets:  Working capital $ 4,703 $ 9,583  Property, plant and equipment 6,385 6,495  Goodwill - 1,016  Share-based compensation 4,923 5,733  Tax losses and tax credit carryforwards 48,881 52,251  Other 14,844 7,635  79,736 82,713  Deferred tax liabilities:  Property, plant and equipment $ (10,918) $ (9,779)  Goodwill (8,390) (9,202)  Intangible assets (54,810) (54,401)  Other (12,051) (8,628)  (86,169) (82,010)  Net deferred tax assets (liabilities) $ (6,433) $ 703   Valuation allowance (13,438) (14,363)  $ (19,871) $ (13,660)  At December 31, 2018, the Company had non-capital loss carryforwards that are available to reduce taxable income in the future years. These non-capital loss carryforwards expire as follows:     2019 $ 106  2020 4,232  2021 5,017  2022 3,543  2023 and thereafter 154,593  $ 167,491  The Company has capital loss carryforwards of approximately $9,292,000 in 2018 (2017: $11,343,000 ) available to reduce future capital gains and interest deduction carryforwards of $22,111,000 (2017: $4,602,000 ), both of which carryforward indefinitely. Tax losses are denominated in the currency of the countries in which the respective subsidiaries are located and operate. Fluctuations in currency exchange rates could reduce the U.S. dollar equivalent value of these tax loss and tax credit carryforwards in future years.  In assessing the realizability of our deferred tax assets, management considers whether it is more likely than not that some portion or all of the deferred tax assets will not be realized. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during periods in which temporary differences become deductible and the loss carryforwards or tax credits can be utilized. Management considers projected future taxable income and tax planning strategies in making our assessment.   9. Income taxes (continued) Uncertain tax positions Tax positions are evaluated in a two-step process. The Company first determines whether it is more likely than not that a tax position will be sustained upon examination. If a tax position meets the more-likely-than-not recognition threshold it is then measured to determine the amount of the benefit to recognize in the financial statements. The tax position is measured as the largest amount of the benefit that is greater than 50% likely of being realized upon ultimate settlement. The Company classifies unrecognized tax benefits that are not expected to result in the payment or receipt of cash within one year as non-current liabilities in the consolidated balance sheets.  At December 31, 2018, the Company had gross unrecognized tax benefits of $22,584,000 ( 2017: $25,910,000 ). Of this total, $10,556,000 (2017: $13,737,000 ) represents the amount of unrecognized tax benefits that, if recognized, would favorably impact the effective tax rate.  Reconciliation of unrecognized tax benefits:     As at December 31, 2018 2017  Unrecognized tax benefits, beginning of year $ 25,910 $ 19,262  Increases - tax positions taken in prior period 725 4,426  Decreases - tax positions taken in prior period (107) (124)  Increases - tax positions taken in current period 2,644 2,346  Settlement and lapse of statute of limitations (4,944) -  Currency translation adjustment (1,644) -  Unrecognized tax benefits, end of year $ 22,584 $ 25,910  Interest expense and penalties related to unrecognized tax benefits are recorded within the provision for income tax expense on the consolidated income statement. At December 31, 2018, the Company had accrued $4,170,000 (2 017: $3,677,000 ) for interest and penalties.  In the normal course of business, the Company is subject to audit by the Canadian federal and provincial taxing authorities, by the U.S. federal and various state taxing authorities and by the taxing authorities in various foreign jurisdictions. Tax years ranging from 2013 to 2018 remain subject to examination in Canada, the United States, Luxembourg, and the Netherlands.

Contingently Redeemable Non-con

Contingently Redeemable Non-controlling Interest in Ritchie Bros. Financial Services	12 Months Ended
	Dec. 31, 2018
Contingently Redeemable Non-controlling Interest in Ritchie Bros. Financial Services [Abstract]
Contingently Redeemable Non-controlling Interest in Ritchie Bros. Financial Services	10. Contingently redeemable non-controlling interest in Ritchie Bros. Financial Services Until July 12, 2016, the Company held a 51% interest in RBFS, an entity that provides loan origination services to enable the Company’s auction customers to obtain financing from third party lenders.  Until July 12, 2016, the Company and the non-controlling interest (“NCI”) holders each held options pursuant to which the Company could acquire, or be required to acquire, the NCI holders’ 49% interest in RBFS. These call and put options became exercisable on April 6, 2016, and the Company had the option to elect to pay the purchase price in either cash or shares of the Company, subject to the Company obtaining all relevant security exchange and regulatory consents and approvals. As a result of the existence of the put option, the NCI was accounted for as a contingently redeemable equity instrument (the “contingently redeemable NCI”). The NCI could be redeemed at a purchase price to be determined through an independent appraisal process conducted in accordance with the terms of the agreement, or at a negotiated price (the “redemption value”). 10. Contingently redeemable non-controlling interest in Ritchie Bros. Financial Services (continued) On July 12, 2016, the Company completed its acquisition of the NCI. On that date, the Company acquired the NCI holders’ 49% interest in RBFS for total consideration of 57,900,000 Canadian dollars ( $44,141,000 ). The purchase price consisted of cash consideration of 53,900,000 Canadian dollars ( $41,092,000 ) and 4,000,000 Canadian dollars ( $3,049,000 ) representing the acquisition date fair value of contingent consideration payable to the former shareholders of RBFS. The contingent payment is payable if RBFS achieves a specified annual revenue growth rate over a three -year post-acquisition period, and is calculated as a specified percentage of the accumulated earnings of RBFS after the three-year post-acquisition period. The maximum amount payable under the contingent payment arrangement is 10,000,000 Canadian dollars. The Company may pay an additional amount not exceeding 1,500,000 Canadian dollars over a three-year period based on the former NCI holders providing continued management services to RBFS. 

Earnings Per Share Attributable

Earnings Per Share Attributable to Stockholders	12 Months Ended
	Dec. 31, 2018
Earnings Per Share Attributable to Stockholders [Abstract]
Earnings Per Share Attributable to Stockholders	11. Earnings per shar e attributable to stockholders Basic earnings per share (“EPS”) attributable to stockholders was calculated by dividing the net income attributable to stockholders by the weighted average (“WA”) number of common shares outstanding during the period. Diluted EPS attributable to stockholders was calculated by dividing the net income attributable to stockholders by the WA number of shares of common stock outstanding if the potentially dilutive securities had been issued. Potentially dilutive securities include unvested PSUs, RSUs, and outstanding stock options. The dilutive effect of potentially dilutive securities is reflected in diluted earnings per share by application of the treasury stock method. Under the treasury stock method, an increase in the fair market value of the Company’s common stock can result in a greater dilutive effect from potentially dilutive securities.      Net income WA  attributable to number Per share  Year ended December 31, 2018 stockholders of shares amount  Basic $ 121,479 108,063,349 $ 1.12  Effect of dilutive securities:  Share units - 459,503 -  Stock options - 865,384 (0.01)  Diluted $ 121,479 109,388,236 $ 1.11      Net income WA  attributable to number Per share  Year ended December 31, 2017 stockholders of shares amount  Basic $ 75,027 107,044,348 $ 0.70  Effect of dilutive securities:  Share units (152) 353,880 -  Stock options - 714,923 (0.01)  Diluted $ 74,875 108,113,151 $ 0.69     Net income WA  attributable to number Per share  Year ended December 31, 2016 stockholders of shares amount  Basic $ 91,832 106,630,323 $ 0.86  Effect of dilutive securities:  Share units 91,997 -  Stock options - 735,474 (0.01)  Diluted $ 91,832 107,457,794 $ 0.85 

Supplemental Cash Flow Informat

Supplemental Cash Flow Information	12 Months Ended
	Dec. 31, 2018
Supplemental Cash Flow Information [Abstract]
Supplemental Cash Flow Information	12. Supplemental cash flow information    Year ended December 31, 2018 2017 2016  Trade and other receivables $ (43,341) $ (19,161) $ 6,419  Inventory (77,292) (8,557) 26,557  Advances against auction contracts (8,266) 3,246 (1,012)  Prepaid expenses and deposits 646 1,178 (7,443)  Income taxes receivable 13,053 (6,067) (10,686)  Auction proceeds payable 8,768 25,783 550  Trade and other payables 39,531 21,854 5,627  Income taxes payable 1,954 (3,986) (8,657)  Share unit liabilities 1,070 (5,421) 4,503  Other (1,673) 1,410 (5,176)  Net changes in operating  assets and liabilities $ (65,550) $ 10,279 $ 10,682  Net capital spending, which consists of property, plant and equipment and intangible asset additions, net of proceeds on disposition of property, plant and equipment, was $32,426,000 for the year ended December 31, 2018 (2017: $34,436,000 , 2016: $29,785,000 ).     Year ended December 31, 2018 2017 2016  Interest paid, net of interest capitalized $ 39,429 $ 23,360 $ 5,792  Interest received 2,888 3,196 1,861  Net income taxes paid 10,352 28,281 54,037   Non-cash purchase of property, plant  and equipment under capital lease $ 8,968 $ 8,820 $ 3,376     2018 2017 2016  Cash and cash equivalents $ 237,744 $ 267,910 $ 207,867  Restricted cash 67,823 63,206 550,222  Cash, cash equivalents, and restricted cash $ 305,567 $ 331,116 $ 758,089  On December 21, 2016, the Company completed the offering of $500,000,000 aggregate principal amount of 5.375% senior unsecured notes due January 15, 2025 (note 22). Upon the closing of the offering, the gross proceeds from the offering were deposited in to an escrow account. The funds were released from escrow upon the closing of the acquisition of IronPlanet (note 29). 

Fair Value Measurement

Fair Value Measurement	12 Months Ended
	Dec. 31, 2018
Fair Value Measurement [Abstract]
Fair Value Measurement	13. Fair value measurement All assets and liabilities for which fair value is measured or disclosed in the consolidated financial statements are categorized within the fair value hierarchy, described as follows, based on the lowest level input that is significant to the fair value measurement or disclosure: ● Level 1: Unadjusted quoted prices in active markets for identical assets or liabilities that the entity can access at measurement date; ● Level 2: Inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly; and ● Level 3: Unobservable inputs for the asset or liability.    December 31, 2018 December 31, 2017  Category Carrying amount Fair value Carrying amount Fair value  Fair values disclosed:  Cash and cash equivalents Level 1 $ 237,744 $ 237,744 $ 267,910 $ 267,910  Restricted cash Level 1 67,823 67,823 63,206 63,206  Short-term debt Level 2 19,896 19,896 7,018 7,018  Long-term debt  Senior unsecured notes Level 1 489,136 487,813 487,339 520,000  Term loans Level 2 222,162 224,582 325,553 329,687  The carrying value of the Company‘s cash and cash equivalents, restricted cash, trade and other receivables, advances against auction contracts, auction proceeds payable, trade and other payables, and short term debt approximate their fair values due to their short terms to maturity. The carrying value of the term loans, before deduction of deferred debt issue costs, approximates its fair value as the interest rates on the loans were short-term in nature. The fair value of the senior unsecured notes is determined by reference to a quoted market price .

Trade and Other Receivables

Trade and Other Receivables	12 Months Ended
	Dec. 31, 2018
Trade and Other Receivables [Abstract]
Trade and Other Receivables	14. Trade and other receivables     As at December 31, 2018 2017  Trade receivables $ 112,680 $ 77,870  Consumption taxes receivable 16,099 13,592  Other receivables 478 643  $ 129,257 $ 92,105  Trade receivables are generally secured by the equipment that they relate to as it is Company policy that equipment is not released until payment has been collected. Trade receivables are due for settlement within three to seven days of the date of sale, after which they are interest bearing. Other receivables are unsecured and non-interest bearing.  As at December 31, 2018, there were $5,942,000 of impaired receivables that have been provided for (December 31, 2017: $5,443,000 ).  Consumption taxes receivable are deemed fully recoverable unless disputed by the relevant tax authority. The other classes within trade and other receivables do not contain impaired assets.

Inventory

Inventory	12 Months Ended
	Dec. 31, 2018
Inventory [Abstract]
Inventory	15. Inventory At each period end, inventory is reviewed to ensure that it is recorded at the lower of cost and net realizable value. During the year ended December 31, 2018, the Company recorded an inventory write-down of $1,011,000 ( 2017 : $834,000 ; 2016: $3,084,000 ).

Other Current Assets

Other Current Assets	12 Months Ended
	Dec. 31, 2018
Other Current Assets [Abstract]
Other Current Assets	16. Other current assets    As at December 31, 2018 2017  Advances against auction contracts $ 15,558 $ 7,336  Assets held for sale 15,051 584  Prepaid expenses and deposits 18,446 19,690  $ 49,055 $ 27,610  Advances against auction contracts Advances against auction contracts arise when the Company pays owners, in advance, a portion of the expected gross auction proceeds from the sale of the related assets at future auctions. The Company‘s policy is to limit the amount of advances to a percentage of the estimated gross auction proceeds from the sale of the related assets, and before advancing funds, require proof of owner‘s title to and equity in the assets, as well as receive delivery of the assets and title documents at a specified auction site, by a specified date and in a specified condition of repair.  Advances against auction contracts are generally secured by the assets to which they relate, as the Company requires owners to provide promissory notes and security instruments registering the Company as a charge against the asset. Advances against auction contracts are usually settled within two weeks of the date of sale, as they are netted against the associated auction proceeds payable to the owner.     Assets held for sale    Balance, December 31, 2016 $ 632  Site preparation costs 25  Reclassified from property, plant and equipment 411  Disposal (484)  Balance, December 31, 2017 584  Reclassified from property, plant and equipment 20,610  Disposal (6,143)  Balance, December 31, 2018 $ 15,051  As at December 31, 2018, the Company’s assets held for sale consisted of two excess auc tion sites located in the United States. Management made the strategic decision to sell these properties to maximize the Company’s return on invested capital. The estimated sales proceeds are expected to be in excess of the current book value. The properties have been actively marketed for sale, and management expects the sales to be completed within 12 months of December 31, 2018. This property belongs to the A&M reportable segment .  As at December 31, 2017 , the Company’s assets held for sale consisted of excess auction sites located in the United States. Management made the strategic decision to sell this excess acreage to maximize the Company’s return on invested capital.      16. Other current assets (continued) Assets held for sale (continued) During the year ended December 31, 2018, the Company sold excess auction site acreage in Prince George, Canada and Albuquerque, United States for net proceeds of $7,071,000 resulting in gains of $1,439,000 (2017: $602,000 gain related to the sale of property locate in Orlando, United States, and Truro, Canada; 2016: $493,000 gain related to the sale of property located in Denver, United States) 

Property, Plant and Equipment

Property, Plant and Equipment	12 Months Ended
	Dec. 31, 2018
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	17. Property, plant and equipment    As at December 31, 2018 Cost Accumulated depreciation Net book value  Land and improvements $ 362,781 $ (72,547) $ 290,234  Buildings 252,182 (106,959) 145,223  Yard and automotive equipment 57,983 (36,640) 21,343  Computer software and equipment 70,623 (60,258) 10,365  Office equipment 28,490 (19,582) 8,908  Leasehold improvements 19,735 (16,240) 3,495  Assets under development 7,031 - 7,031  $ 798,825 $ (312,226) $ 486,599     As at December 31, 2017 Cost Accumulated depreciation Net book value  Land and improvements $ 379,546 $ (68,706) $ 310,840  Buildings 267,334 (103,544) 163,790  Yard and automotive equipment 58,209 (38,126) 20,083  Computer software and equipment 69,718 (60,451) 9,267  Office equipment 25,430 (18,745) 6,685  Leasehold improvements 21,467 (15,090) 6,377  Assets under development 9,539 - 9,539  $ 831,243 $ (304,662) $ 526,581  During the year ended December 31, 2018, interest of $110,000 (2017: $110,000 ; 2016: $95,000 ) was capitalized to the cost of assets under development. These interest costs relating to qualifying assets are capitalized at a weighted average rate of 4.06% (2017 : 2.97% ; 2016: 3.99% ).  Additions during the year include $8,968,000 (2017: $8,820,000 ; 2016: $3,376,000 ) of property, plant and equipment under capital leases.

Other Non-current Assets

Other Non-current Assets	12 Months Ended
	Dec. 31, 2018
Other Non-current Assets [Abstract]
Other Non-current Assets	18. Other non-current assets    As at December 31, 2018 2017  Tax receivable $ 12,705 $ 12,851  Deferred debt issue costs 2,017 3,768  Equity-accounted investments 4,010 7,408  Other 10,663 7,527  $ 29,395 $ 31,554  Equity-accounted investments The Company holds a 48% share interest in a group of companies detailed below (together, the “Cura Classis entities”), which have common ownership. The Cura Classis entities provide dedicated fleet management services in three jurisdictions to a common customer unrelated to the Company. The Company has determined the Cura Classis entities are variable interest entities and the Company is not the primary beneficiary, as it does not have the power to make any decisions that significantly affect the economic results of the Cura Classis entities. Accordingly, the Company accounts for its investments in the Cura Classis entities following the equity method.  A condensed summary of the Company's investments in and advances to equity-accounted investees are as follows (in thousands of United States dollars, except percentages):    Ownership December 31, December 31,  percentage 2018 2017  Cura Classis entities 48% $ 4,010 $ 4,720  Other equity investments 32% - 2,688  4,010 7,408 As a result of the Company’s investments, the Company is exposed to risks associated with the results of operations of the Cura Classis entities. The Company has no other business relationships with the Cura Classis entities. The Company’s maximum risk of loss associated with these entities is the investment carrying amount.

Intangible Assets

Intangible Assets	12 Months Ended
	Dec. 31, 2018
Goodwill and Intangible Assests [Abstract]
Intangible Assets	19. Intangible assets    As at December 31, 2018 Cost Accumulated amortization Net book value  Trade names and trademarks $ 53,409 $ (1,201) $ 52,208  Customer relationships 124,986 (22,010) 102,976  Software 127,320 (48,522) 78,798  Software under development 11,640 - 11,640  $ 317,355 $ (71,733) $ 245,622        19. Intangible assets (continued)     As at December 31, 2017 Cost Accumulated amortization Net book value  Trade names and trademarks $ 53,566 $ (461) $ 53,105  Customer relationships 125,234 (9,487) 115,747  Software 110,201 (26,898) 83,303  Software under development 8,939 - 8,939  $ 297,940 $ (36,846) $ 261,094  During the year ended December 31, 2018, the Company recognized an impairment loss of n il (2017: the Company recorded an impairment loss relating to certain software and software under development $8,911,000 ; 2016: the Company recorded an impairment loss on the Equipment One customer relationships of $4,669,000 ) (note 7).  At December 31, 2018, a net carrying amount of $61,883,000 (December 31, 2017: $59,380,000 ) included in intangible assets was not subject to amortization. During the year ended December 31, 2018 , the cost of additions was reduced by $1,606,000 for recognition of tax credits (2017: $888,000 ; 2016: $1,094,000 )  During the year ended December 31, 2018, interest of $460,000 (2017 : $281,000 ; 2016: $356,000 ) was capitalized to the cost of software under development. These interest costs relating to qualifying assets are capitalized at a weighted average rate of 4.09% (2017 : 3.18% ; 2016: 4.91% ).  During the year ended December 31 , 2018, the weighted average amortization period for all classes of intangible assets was 8.2 years (2017: 7.9 years; 2016: 8.2 years ).  As at December 31, 2018, estimated annual amortization expense for the next five years ended December 31 are as follows:     2019 $ 35,651  2020 28,801  2021 23,303  2022 20,727  2023 16,567  $ 125,049 

Goodwill

Goodwill	12 Months Ended
	Dec. 31, 2018
Goodwill and Intangible Assests [Abstract]
Goodwill	20. Goodwill    Balance, December 31, 2016 $ 97,537  Additions 568,936  Foreign exchange movement 4,449  Balance, December 31, 2017 $ 670,922  Additions 3,671  Foreign exchange movement (2,999)  Balance, December 31, 2018 $ 671,594 

Trade And Other Payables

Trade And Other Payables	12 Months Ended
	Dec. 31, 2018
Trade And Other Payables [Abstract]
Trade And Other Payables	21. Trade and other payables    As at December 31, 2018 2017  Trade payables $ 93,482 $ 77,575  Accrued liabilities 63,666 55,332  Social security and sales taxes payable 19,390 14,693  Net consumption taxes payable 13,456 10,559  Share unit liabilities 3,714 5,407  Other payables 7,547 987  $ 201,255 $ 164,553 

Debt

Debt	12 Months Ended
	Dec. 31, 2018
Debt [Abstract]
Debt	22. Debt    Carrying amount  As at December 31, 2018 2017  Short-term debt $ 19,896 $ 7,018   Long-term debt:   Term loans (previously referred to as Delayed draw term loans):  Denominated in Canadian dollars, secured, bearing interest at a weighted  average rate of 4.339% , due in monthly installments of interest only and  quarterly installments of principal, maturing in October 2021 161,891 185,143  Denominated in United States dollars, secured, bearing interest at a weighted  average rate of 4.497% , due in weekly installments of interest only and  quarterly installments of principal, maturing in October 2021 62,690 144,544  Less: unamortized debt issue costs (2,419) (4,134)  Senior unsecured notes:  Bearing interest at 5.375% due in semi-annual installments, with the full  amount of principal due in January 2025 500,000 500,000  Less: unamortized debt issue costs (10,864) (12,661)  Total long-term debt 711,298 812,892   Total debt $ 731,194 $ 819,910   Long-term debt:  Current portion $ 13,126 $ 16,907  Non-current portion 698,172 795,985  Total long-term debt $ 711,298 $ 812,892  On October 27, 2016, the Company entered into a credit agreement (the “Credit Agreement”) with a syndicate of lenders, and Bank of America, N.A. (“BofA”), as administrative agent. At that time, the Credit Agreement provided the Company with: · Multicurrency revolving facilities of up to $675,000,000 (the “Revolving facilities”); · A delayed draw term loan facility of up to $325,000,000 (the “Term loans”); · At the Company’s election and subject to certain conditions, including receipt of related commitments, incremental term loan facilities and/or increases to the Revolving facilities in an aggregate amount of up to $50,000,000 . 22. Debt (continued) The Company may use the proceeds from the Revolving facilities for general corporate purposes. The amount available pursuant to the Terms loans was only available to finance the acquisition of IronPlanet and is not be available for other corporate purposes upon repayment of amounts borrowed under that facility. On May 31, 2017, the Company borrowed $325,000,000 under the Term loans to finance the acquisition of IronPlanet (note 29). The Term loans amortize in equal quarterly installments in an annual amount of 5% for the first two years and 10% in the third through fifth years, with the balance payable at maturity. Upon the closing of the acquisition the Credit Agreement became secured by the assets of the Company and certain of its subsidiaries in Canada and the United States. The Credit Agreement may become unsecured again, subject to the Company meeting specified credit rating or leverage ratio conditions.  On June 21, 2018, the Company reduced the amount available on the Company’s Revolving facilities by $185,000,000 . At December 31, 2018, the Company’s Credit Agreement provides the Company with: · Revolving facilities of up to $490,000,000 · Terms loan s used to finance the acquisition of IronPlanet and · At the Company’s election and subject to certain conditions, including receipt of related commitments, incremental T erm loan facilities and/or increases to the R evolving facilities in an aggregate amount of up to $50,000,000 . For the year ended December 31, 2018, the Company made scheduled debt repayments of $11,013,000 on the term loans (2017: $8,410,000 ). For the year ended December 31 , 2018, the Company made voluntary prepayments totalling $80,000,000 (2017: $ nil) on the term loan denominated in United States dollars. Prepayments are applied against future scheduled mandatory payments.  On December 21, 2016, the Company completed the offering of $500,000,000 aggregate principal amount of 5.375% senior unsecured notes due January 15, 2025 (the “Notes”). Interest on the Notes is payable semi-annually. The proceeds from the offering were held in escrow until completion of the acquisition of IronPlanet. On May 31, 2017, the funds were released from escrow to finance the acquisition of IronPlanet. The Notes are jointly and severally guaranteed on an unsecured basis, subject to certain exceptions, by each of the Company’s subsidiaries that is a borrower or guarantees indebtedness under the Credit Agreement. IronPlanet and certain of its subsidiaries were added as additional guarantors in connection with the acquisition of IronPlanet.  Short-term debt is comprised of drawings in different currencies on the Company’s committed revolving credit facilities and have a weighted average interest rate of 2.3% (December 31, 2017: 2.7% ).  As at December 31, 2018, principal repayments for the remaining period to the contractual maturity dates are as follows:    Face value  2019 13,126  2020 17,502  2021 193,953  2022 -  2023 -  Thereafter 500,000  $ 724,581  As at December 31, 2018, the Company had unused committed revolving credit facilities aggregating $467,801,000 of which $463,673,000 is available until October 27, 2021.

Other Non-current Liabilities

Other Non-current Liabilities	12 Months Ended
	Dec. 31, 2018
Other Non-current Liabilities [Abstract]
Other Non-current Liabilities	23 . Other non-current liabilities    As at December 31, 2018 2017  Tax payable $ 22,583 $ 25,958  Finance lease obligation 10,146 7,875  Share unit liabilities - 2,865  Other 9,251 10,075  $ 41,980 $ 46,773 

Equity and Dividends

Equity and Dividends	12 Months Ended
	Dec. 31, 2018
Equity and Dividends [Abstract]
Equity and Dividends	24 . Equity and dividends Share capital Preferred stock Unlimited number of senior preferred shares, without par value, issuable in series. Unlimited number of junior preferred shares, without par value, issuable in series. All issued shares are fully paid. No preferred shares have been issued.  Share repurchase In the years ended December 31, 2018 and December 31, 2017, there were no common shares repurchased. In 2016 1,460,000 common shares were repurchased at a weighted average (“WA”) share price of $25.16 per common share. The repurchased shares were cancelled on March 15, 2016.  Dividends Declared and paid The Company declared and paid the following dividends during the years ended December 31, 2018, 2017, and 2016:    Declaration date Dividend per share Record date Total dividends Payment date  Year ended December 31, 2018:  Fourth quarter 2017 January 26, 2018 $ 0.1700 February 16, 2018 $ 18,246 March 9, 2018  First quarter 2018 May 9, 2018 0.1700 May 30, 2018 18,342 June 20, 2018  Second quarter 2018 August 7, 2018 0.1800 August 29, 2018 19,528 September 19, 2018  Third quarter 2018 November 8, 2018 0.1800 November 28, 2018 19,562 December 19, 2018   Year ended December 31, 2017:  Fourth quarter 2016 January 23, 2017 $ 0.1700 February 10, 2017 $ 18,160 March 3, 2017  First quarter 2017 May 4, 2017 0.1700 May 23, 2017 18,188 June 13, 2017  Second quarter 2017 August 4, 2017 0.1700 August 25, 2017 18,210 September 15, 2017  Third quarter 2017 November 8, 2017 0.1700 November 29, 2017 18,227 December 20, 2017   Year ended December 31, 2016:  Fourth quarter 2015 January 15, 2016 $ 0.1600 February 12, 2016 $ 17,154 March 4, 2016  First quarter 2016 May 9, 2016 0.1600 May 24, 2016 17,022 June 14, 2016  Second quarter 2016 August 5, 2016 0.1700 September 2, 2016 18,127 September 23, 2016  Third quarter 2016 November 8, 2016 0.1700 November 28, 2016 18,156 December 19, 2016    24 . Equity and dividends (continued) Declared and undistributed In addition to the above dividends, since the end of the year the Directors have recommended the payment of a final dividend of $0.18 cents per common share, accumulating to a total dividend of $19,569,000 . The aggregate amount of the proposed final dividend is expected to be paid out of retained earnings on March 9, 2019 to stockholders of record on February 15, 2019 . This dividend payable has not been recognized as a liability in the financial statements. The payment of this dividend will not have any tax consequence for the Company. 

Share-Based Payments

Share-Based Payments	12 Months Ended
	Dec. 31, 2018
Share-Based Payments [Abstract]
Share-Based Payments	25. Share-based payments Share-based payments consist of the following compensation costs:    Year ended December 31, 2018 2017 2016  Stock option compensation expense:  SG&A expenses $ 7,895 $ 8,948 $ 5,507  Acquisition-related costs 357 4,752 -  Share unit expense:  Equity-classified share units 11,256 3,529 1,981  Liability-classified share units 1,764 670 10,512  Employee share purchase plan -  employer contributions 2,174 1,813 1,597  $ 23,446 $ 19,712 $ 19,597  Share unit expense and employer contributions to the employee share purchase plan are recognized in SG&A expenses.  Stock option plans The Company has three stock option plans that provide for the award of stock options to selected employees, directors, and officers of the Company: a) Amended and Restated Stock Option Plan, b) IronPlanet 1999 Stock Plan, and c) IronPlanet 2015 Stock Plan. The IronPlanet 1999 Stock Plan and IronPlanet 2015 Stock Plan were assumed by the Company as part of the acquisition of IronPlanet (note 29).  Stock options are granted with an exercise price equal to the fair market value of the Company‘s common shares at the grant date, with vesting periods ranging from immediate to five years and terms not exceeding 10 years. At December 31, 2018, there were 2,478,321 (December 31, 2017: 3,402,481 ) shares authorized and available for grants of options under the stock option plans. 25. Share-based payments (continued) Stock option plans (continued)  Stock option activity for the years ended December 31, 2018, 2017, and 2016 is presented below:    WA  Common WA remaining Aggregate  shares under exercise contractual intrinsic  option price life (in years) value  Outstanding, December 31, 2015 3,276,078 23.40  Granted 1,268,101 24.34  Exercised (1,081,531) 22.50 $ 9,380  Forfeited (95,934) 24.32  Outstanding, December 31, 2016 3,366,714 $ 24.02 7.5 $ 33,601  Granted 970,947 31.07  Assumed in acquisition 737,358 14.26  Exercised (444,571) 22.35 $ 3,762  Forfeited (170,704) 19.38  Outstanding, December 31, 2017 4,459,744 $ 24.29 7.5 $ 17,649  Granted 923,199 32.14  Exercised (1,235,154) 23.10 $ 14,808  Forfeited (132,624) 25.91  Expired (1,302) 25.76  Outstanding, December 31, 2018 4,013,863 $ 26.41 7.2 $ 25,374  Exercisable, December 31, 2018 2,074,873 $ 24.06 6.2 $ 17,963  The options outstanding at December 31, 2018 expire on dates ranging to November 15, 2028. The WA grant date fair value of options granted during the year ended December 31, 2018 was $7.69 per option (2017: $ 7.22 ; 2016: $ 4.72 ). The WA share price of options exercised during the year ended December 31, 2018 was $35.08 (2017: $ 30.81 ; 2016: $ 31.18 ).  The fair value of the stock option grants was estimated on the date of the grant using the Black-Scholes option pricing model. The significant assumptions used to estimate the fair value of stock options granted during the years ended December 31, 2018, 2017, and 2016 are presented in the following table on a weighted average basis:    Year ended December 31, 2018 2017 2016  Risk free interest rate 2.7% 2.0% 1.2%  Expected dividend yield 2.11% 2.15% 2.66%  Expected lives of the stock options 5 years 5 years 5 years  Expected volatility 28.1% 27.8% 26.5%  25. Share-based payments (continued) Stock option plans (continued) The fair value of the assumed stock options is estimated on the IronPlanet acquisition date using the Black-Scholes option pricing model. The weighted average fair value of the assumed options was $16.93 . The significant assumptions used to estimate the fair value of these assumed stock options are presented in the following table on a weighted average basis:     Year ended December 31, 2017  Risk free interest rate 0.8%  Expected dividend yield 2.19%  Expected lives of the stock options 0.4 years  Expected volatility 32.1%  The compensation expense arising from option grants is amortized over the relevant vesting periods of the underlying options. As at December 31, 2018, the unrecognized stock-based compensation cost related to the non-vested stock options was $4,702,000 , which is expected to be recognized over a weighted average period of 1.9 years. Cash received from stock-based award exercises for the year ended December 31, 2018 was $28,524,000 (2017: $9,936,000 ; 2016: $24,338,000 ). The actual tax benefit realized for the tax deductions from option exercise of the share based payment arrangements totaled $2,793,000 for the year ended December 31, 2018 (2017: $ 1,017,000 ; 2016: $ 1,464,000 ).  25. Share-based payments (continued) Share unit plans Share unit activity for the years ended December 31, 2018, 2017, and 2016 is presented below:    Equity-classified awards Liability-classified awards  PSUs RSUs PSUs RSUs DSUs  WA grant WA grant WA grant WA grant WA grant  date fair date fair date fair date fair date fair  Number value Number value Number value Number value Number value   Outstanding, December 31, 2015 - $ - - $ - 421,585 $ 24.03 332,954 $ 22.70 57,996 $ 24.21  Granted 7,714 31.40 - - 257,117 23.32 4,543 29.33 17,371 29.41  Transferred to (from) equity  awards on modification 257,934 27.34 - - (257,934) 23.86 - - - -  Vested and settled - - - - (68,683) 23.08 (162,306) 22.23 (1,847) 25.28  Forfeited (21,680) 27.43 - - (40,756) 22.75 (15,182) 22.68 - -   Outstanding, December 31, 2016 243,968 $ 27.48 - $ - 311,329 $ 23.96 160,009 $ 23.37 73,520 $ 25.41  Granted 136,073 30.28 125,152 26.93 98,775 31.21 878 32.30 19,967 29.67  Transferred to (from) equity  awards on modification 81,533 24.47 - - (81,533) 24.66 - - - -  Vested and settled (27,326) 26.82 - - (49,873) 23.64 (156,221) 23.33 - -  Forfeited - - - - (19,457) 26.39 - - - -  Outstanding, December 31, 2017 434,248 $ 27.83 125,152 $ 26.93 259,241 $ 26.38 4,666 $ 26.42 93,487 $ 26.32  Granted 240,803 35.63 91,251 32.10 - - 66 34.70 26,553 33.42  Transferred to equity  awards on modification 257,659 31.30 - - (257,659) 26.38 - - - -  Vested and settled (212,263) 33.78 - - - - (4,732) 26.54 (6,605) 23.16  Forfeited (50,159) 31.41 (8,417) 32.00 (1,582) 26.45 - - - -  Outstanding, December 31, 2018 670,288 $ 31.46 207,986 $ 28.99 - $ - - $ - 113,435 $ 28.16 (1) Liability-classified PSUs include PSUs awarded under the employee PSU plan and the previous 2013 PSU plan, in place prior to 2015, that are cash-settled and not subject to market vesting conditions.  The total market value of liability-classified share units vested and released during the year ended December 31, 2018 was $410,000 (2017: $6, 521,000; 2016: $4,463,000 ). The Company modified the employee PSU plans from liability-classified to equity-classified share units prior to the 2018 vesting.  Senior executive and employee PSU plans The Company grants PSUs under a senior executive PSU plan and an employee PSU plan (the “PSU Plans”). Under the PSU Plans, the number of PSUs that vest is conditional upon specified market, service, and performance vesting conditions being met. The PSU Plans allow the Company to choose whether to settle the awards in cash or in shares. With respect to settling in shares, the Company has the option to either (i) arrange for the purchase shares on the open market on the employee’s behalf based on the cash value that otherwise would be delivered, or (ii) to issue a number of shares equal to the number of units that vest.  25. Share-based payments (continued) Share unit plans (continued) Senior executive and employee PSU plans (continued) Prior to May 2, 2016, the Company was only able to settle the PSU awards under the PSU Plans in cash, and as such, both the PSU Plans were classified as liability awards. The significant assumptions used to estimate the fair value of the liability-classified PSUs awarded under the employee PSU plan during 2017 and 2016 are presented in the following table on a weighted average basis:    Year ended December 31, 2017 2016  Risk free interest rate 1.5% 1.2%  Expected dividend yield 2.01% 2.40%  Expected lives of the PSUs 3 years 3 years  Expected volatility 28.9% 29.7%  Average expected volatility of comparable companies 33.4% 37.0%  Risk free interest rate is estimated using Bloomberg’s United States dollar Swap Rate as of the valuation date. Expected dividend yield assumes a continuation of the most recent quarterly dividend payments. Given the limited historical information available for the PSUs, the Company estimated the expected life of PSUs with reference to the expected life of stock options. Stock options have five -year expected lives, whereas PSUs vest after three years. As such, the Company estimates the expected life of the PSUs to equal the three-year vesting period. Expected volatility is estimated from Bloomberg’s volatility surface of the common shares as of the valuation date. 2016 Modification On May 2, 2016, the shareholders approved amendments to the PSU Plans, allowing the Company to choose whether to settle the awards in cash or in shares.  On May 2, 2016, the employee PSU plan remained classified as a liability and the senior executive PSU plan awards were reclassified to equity awards, based on the Company’s settlement intentions for each plan which remain unchanged at December 31, 2017. No incremental compensation was recognized as a result of the modification. Unrecognized compensation expense based on the fair value of the senior executive PSU awards on the modification date will be amortized over the remaining service period .  2018 Modification On March 1, 2018, the Company modified the market and performance vesting conditions for the PSUs. Concurrently, the PSUs under the employee PSU plan were reclassified to equity awards based on the Company’s settlement intentions. The weighted average fair value of the PSU awards outstanding on the modification date was $31.35 . The incremental compensation recognized as a result of the vesting condition modification was $1,400,000 . The share unit liability related to the employee PSUs, representing the portion of the fair value attributable to past service, was $6,701,000 , which was reclassified to equity on that date. No incremental compensation was recognized as a result of the employee PSU settlement modification.  25. Share-based payments (continued) Share unit plans (continued) Senior executive and employee PSU plans (continued) The fair value of the equity-classified PSUs awarded is estimated on modification date and on the date of grant using a Monte-Carlo simulation model. The significant assumptions used to estimate the fair value of the equity-classified PSUs awarded during 2018 , 2017 and 201 6 are presented in the following table on a weighted average basis:     Year ended December 31, 2018 2017 2016  Risk free interest rate 1.92% 1.4% 1.2%  Expected dividend yield 2.09% 1.92% 2.50%  Expected lives of the PSUs 3 years 3 years 3 years  Expected volatility 31.1% 28.2% 29.9%  Average expected volatility of comparable companies 34.1% 37.0% 37.0% As at December 31, 2018, the unrecognized share unit expense related to equity-classified PSUs was $7,874,000 , which is expected to be recognized over a weighted average period of 1.7 years.  Sign-on grant PSUs On August 11, 2014, the Company awarded 102,375 one-time sign-on grant PSUs (the “SOG PSUs”) that are subject to market vesting conditions related to the Company’s share performance over rolling two , three , four , and five -year periods. The SOG PSUs were modified in the current and comparative years, as detailed below in chronological order.  2017 modification Prior to May 1, 2017, the Company was only able to settle the SOG PSU award in cash, and as such, the plan was classified as a liability award. On May 1, 2017 (the “2017 SOG modification date”), the shareholders approved amendments to the SOG PSU grant, allowing the Company to choose whether to settle the award in cash or in shares. The Company chose to settle in shares and, accordingly: · The shareholders authorized 150,000 shares to be issued for settlement of the SOG PSUs; and · The share unit liability, representing the portion of the fair value attributable to past service, of $1,421,000 was reclassified to equity.  The weighted average fair value of the SOG PSUs outstanding on the modification date was $24.47 . No incremental compensation was recognized as a result of the modification. At the time of this modification, the SOG PSUs were contingently redeemable in cash in the event of death of the participant. Consequently, the Company reclassified $1,803,000 to temporary equity, representing the portion of the contingent redemption amount of the SOG PSUs as if redeemable on May 1, 2017, to the extent attributable to prior service.  2018 modification On September 11, 2018, the Company modified the performance vesting conditions of the SOG PSUs. The modification impacted the third and fourth tranches of PSUs to vest. As a result of the modification, the actual number of units to vest will be determined by the Board of Directors of the Company based on absolute Total Shareholder Return (“TSR”) performance over the period commencing on July 1, 2017, and ending on the fourth and fifth anniversaries of the grant date. Prior to this modification, the absolute TSR performance period commenced on August 11, 2014. 25. Share-based payments (continued) Share unit plans (continued) Senior executive and employee PSU plans (continued) Sign-on grant PSUs The weighted average fair value of the PSU awards outstanding on the modification date was $43.34 . The incremental compensation recognized as a result of the vesting condition modification was $838,000 . It was determined based on the change in fair value of the equity-classified SOG PSUs immediately before and after modification. Significant assumptions used to estimate the fair value of the equity-classified SOG PSUs to determine the incremental compensation cost were as follows:    September 11, 2018 2018  Risk free interest rate 2.7%  Expected dividend yield 1.53%  Expected lives of the PSU 1 year  Expected volatility 29.2%  Unrecognized compensation expense based on the fair value of the SOG PSU award on the modification date will be amortized over the remaining service period.  RSUs The Company has RSU plans that are equity-settled and not subject to market vesting conditions.  Prior to November 8, 2017, the Company was only able to settle the RSU awards in cash, and as such, the RSUs were classified as liability awards, which are fair valued on grant date and at each reporting date using the 20-day volume weighted average price of the Company’s common shares listed on the New York Stock Exchange. On November 8, 2017 (the “RSU modification date”), the Board of Directors approved amendments to the RSU plans, allowing the Company to choose whether to settle the awards in cash or in shares for new RSUs granted after the RSU modification date. With respect to settling in shares, the Company has the option to either (i) arrange for the purchase shares on the open market on the employee’s behalf based on the cash value that otherwise would be delivered, or (ii) to issue a number of shares equal to the number of units that vest, net of any applicable withholding, if any.  As at December 31, 2018, the unrecognized share unit expense related to equity-classified RSUs was $3,994,000 , which is expected to be recognized over a weighted average period of 2.0 years .  DSUs The Company has DSU plans that are cash-settled and not subject to market vesting conditions.  Fair values of DSUs are estimated on grant date and at each reporting date using the 20-day volume weighted average price of the Company’s common shares listed on the New York Stock Exchange. DSUs are granted under the DSU plan to members of the Board of Directors. There is no unrecognized share unit expense related to liability-classified DSUs as they vest immediately and are expensed upon grant.  As at December 31, 2018, the Company had a total share unit liability of $3,714,000 (2017: $2,645,000 ) in respect of share units under the DSU plans. 25. Share-based payments (continued) Employee share purchase plan The Company has an employee share purchase plan that allows all employees that have completed two months of service to contribute funds to purchase common shares at the current market value at the time of share purchase. Employees may contribute up to 4% of their salary. The Company will match between 50% and 100% of the employee‘s contributions, depending on the employee‘s length of service with the Company.

Commitments

Commitments	12 Months Ended
	Dec. 31, 2018
Commitments [Abstract]
Commitments	26. Commitments Commitments for expenditures As at December 31, 2018, the Company had committed to, but not yet incurred, $1,151,000 in capital expenditures for property, plant and equipment and intangible assets (December 31, 2017: $1,612,000 ).  Commitment for inventory purchase The Company entered into a two-year non-rolling stock surplus contract with the U.S. Government Defense Logistics Agency (the “DLA”) in December 2017 with the option to extend for up to four-years. Pursuant to the contract the performance period commenced in April 2018 and concludes in March 2020.  The Company has committed to purchase between 150,000 and 245,900 units of property with an expected minimum value of $11,104,000 and up to $51,028,000 annually to the extent that goods are available from the DLA over the initial 12 month period relating to the purchase of inventory. At December 31, 2018, the Company has purchased $35,900,000 pursuant to the initial 12 month period of this contract which commenced in April 2018.  Operating lease commitments – the Company as lessee The Company has entered into commercial leases for various auction sites and offices located in North America, Central America, Europe, the Middle East and Asia. The majority of these leases are non-cancellable. The Company also has further operating leases for computer equipment, certain motor vehicles and small office equipment where it is not in the best interest of the Company to purchase these assets.  The majority of the Company‘s operating leases have a fixed term with a remaining life between one month and 20 years with renewal options included in the contracts. The leases have varying contract terms, escalation clauses and renewal rights. There are no restrictions placed upon the lessee by entering into these leases, other than restrictions on use of property, sub-letting and alterations. In certain leases there are options to purchase; if the intention to take this option changes subsequent to the commencement of the lease, the Company re-assesses the classification of the lease as operating.  The future aggregate minimum lease payments under non-cancellable operating leases, excluding reimbursed costs to the lessor, are as follows:    2019 $ 15,988  2020 13,276  2021 10,554  2022 8,317  2023 6,560  Thereafter 42,333  $ 97,028 As at December 31, 2018, the total future minimum sublease payments expected to be received under non-cancellable subleases is $1,187,000 (2017: $1,936,000 ; 2016 $577,000 ). The lease expenditure charged to earnings during the year ended December 31, 2018 was $27,734,000 (2017: $21,956,000 ; 2016: $20,075,000 ). 26. Commitments (continued) Capital lease commitments – the Company as lessee The Company has entered into capital lease arrangements for computer and yard equipment. The majority of the leases have a fixed term with a remaining life of one month to four years with renewal options included in the contracts. In certain of these leases, the Company has the option to purchase the leased asset at fair market value or a stated residual value at the end of the lease term.  As at December 31, 2018, the net carrying amount of computer and yard equipment under capital leases is $14,976,000 (December 31, 2017: $10,692,000 ), and is included in the total property, plant and equipment as disclosed on the consolidated balance sheets.  The future aggregate minimum lease payments under non-cancellable finance leases are as follows:    2019 $ 5,480  2020 4,564  2021 3,327  2022 2,023  2023 814  Thereafter -  $ 16,208  Assets recorded under capital leases are as follows:    As at December 31, 2018 Cost Accumulated depreciation Net book value  Computer equipment $ 9,428 $ (3,992) $ 5,436  Yard and others 12,125 (2,585) 9,540  $ 21,553 $ (6,577) $ 14,976     As at December 31, 2017 Cost Accumulated depreciation Net book value  Computer equipment $ 8,699 $ (3,604) $ 5,095  Yard and auto equipment 6,493 (896) 5,597  $ 15,192 $ (4,500) $ 10,692 

Contingencies

Contingencies	12 Months Ended
	Dec. 31, 2018
Contingencies [Abstract]
Contingencies	27. Contingencies Legal and other claims The Company is subject to legal and other claims that arise in the ordinary course of its business. Management does not believe that the results of these claims will have a material effect on the Company’s consolidated balance sheet or consolidated income statement.  27. Contingencies (continued) Guarantee contracts In the normal course of business, the Company will in certain situations guarantee to a consignor a minimum level of proceeds in connection with the sale at auction of that consignor’s equipment.  At December 31, 2018, there were $41,461,000 of assets guaranteed under contract, of which 51% is expected to be sold prior to March 31, 2019 with the remainder to be sold by May 31, 2020 (December 31, 2017: $30,948,000 of which 27% is expected to be sold prior to the end of March 31, 2018 with the remainder to be sold by December 31, 2018). The outstanding guarantee amounts are undiscounted and before estimated proceeds from sale at auction.

Selected Quarterly Financial Da

Selected Quarterly Financial Data	12 Months Ended
	Dec. 31, 2018
Selected Quarterly Financial Data [Abstract]
Selected Quarterly Financial Data	28. Selected quarterly financial data (unaudited) Certain comparative figures have been restated to conform to current presentation (Note 2(y)). The following is a summary of selected quarterly financial information (unaudited):    Attributable to stockholders  Operating Net Net Earnings per share  2018 Revenues income income income Basic Diluted  First quarter $ 260,178 $ 32,873 $ 17,207 $ 17,138 $ 0.16 $ 0.16  Second quarter 308,530 64,795 45,727 45,717 0.42 0.42  Third quarter 245,346 31,194 23,112 23,138 0.21 0.21  Fourth quarter 355,972 56,327 35,460 35,486 0.33 0.32     Net Attributable to stockholders  Operating income Net income Earnings (loss) per share  2017 Revenues income (loss) (loss) Basic Diluted  First quarter $ 199,427 $ 23,597 $ 10,433 $ 10,377 $ 0.10 $ 0.10  Second quarter 252,613 26,888 17,713 17,635 0.16 0.16  Third quarter 227,401 16,931 10,323 10,261 0.10 0.09  Fourth quarter 291,750 40,038 36,837 36,754 0.34 0.34     Attributable to stockholders  Operating Net Net Earnings per share  2016 Revenues income income income Basic Diluted  First quarter $ 255,504 $ 39,174 $ 29,994 $ 29,406 $ 0.28 $ 0.27  Second quarter 275,667 53,635 40,591 39,710 0.37 0.37  Third quarter 300,976 2,285 (5,000) (5,137) (0.05) (0.05)  Fourth quarter 294,830 40,628 27,927 27,853 0.26 0.26   

Business Combinations

Business Combinations	12 Months Ended
	Dec. 31, 2018
Business Combinations [Abstract]
Business Combinations	29. Business combinations IronPlanet acquisition On May 31, 2017 (the “IronPlanet Acquisition Date”), the Company acquired 100% of the issued and outstanding shares of IronPlanet for a total fair value consideration of $776,474,000 . As at the acquisition date, cash consideration of $772,706,000 , of which approximately $35,000,000 was placed in escrow, was paid to the former shareholders, vested option holders and warrant holders of IronPlanet. In addition to the cash consideration, non-cash consideration of $2,330,000 was issued attributable to the assumption of outstanding IronPlanet options, $1,771,000 was paid in cash and placed in escrow, related to customary closing adjustments, and $333,000 was related to settlement of intercompany payable transactions. Funds placed in escrow of $36,771,000 were released in March 2018. A summary of the net cash flows and purchase price are detailed below     May 31, 2017  Cash consideration paid to former equity holders $ 723,810  Settlement of IronPlanet's debt 36,313  Settlement of IronPlanet's transaction costs 12,583  Cash consideration paid on closing 772,706  Cash consideration paid related to closing adjustments 1,771  Less: cash and cash equivalents acquired (95,626)  Less: restricted cash acquired (3,000)  Acquisition of IronPlanet, net of cash acquired $ 675,851   Cash consideration paid on closing $ 772,706  Replacement stock option awards attributable to pre-  combination services 4,926  Stock option compensation expense from accelerated vesting  of awards attributable to post-combination services (2,596)  Cash consideration paid relating to closing adjustments 1,771  Settlement of pre-existing intercompany balances (333)  Purchase price $ 776,474  IronPlanet is a leading online marketplace for selling and buying used equipment and other durable assets and an innovative participant in the multi–billion dollar used equipment market. The acquisition expands the breadth and depth of equipment disposition and management solutions the Company can offer its customers. The acquisition was accounted for in accordance with ASC 805, Business Combinations . The assets acquired and liabilities assumed were recorded at their estimated fair values at the IronPlanet Acquisition Date. Goodwill of $568,566,000 was calculated as the fair value of consideration over the estimated fair value of the net assets acquired. 29. Business combinations (continued) IronPlanet acquisition (continued) IronPlanet purchase price allocation    May 31, 2017  Purchase price $ 776,474   Assets acquired:  Cash and cash equivalents $ 95,626  Restricted cash 3,000  Trade and other receivables 13,021  Inventory 600  Advances against auction contracts 4,623  Prepaid expenses and deposits 1,645  Income taxes receivable 55  Property, plant and equipment 2,381  Other non-current assets 2,551  Deferred tax assets 1,497  Intangible assets ~ 188,000   Liabilities assumed:  Auction proceeds payable 63,616  Trade and other payables 15,540  Deferred tax liabilities 25,935  Fair value of identifiable net assets acquired 207,908  Goodwill acquired on acquisition $ 568,566  ~ Intangible assets consist of indefinite-lived trade names and trademarks, customer relationships with estimated useful lives of ranging from six to 13 years, and a technology platform with an estimated useful life of 7 years. Goodwill The main drivers generating goodwill are the anticipated synergies from (1) the Company's auction expertise and transactional capabilities to IronPlanet's existing customer base, (2) IronPlanet providing existing technology to the Company's current customer base, and (3) future growth from international expansion and new Caterpillar dealers. Other factors generating goodwill include the acquisition of IronPlanet's assembled work force and their associated technical expertise .

Significant Accounting Polici_2

Significant Accounting Policies (Policy)	12 Months Ended
	Dec. 31, 2018
Significant Accounting Policies [Abstract]
Basis of Preparation	(a) Basis of preparation These financial statements have been prepared in accordance with United States generally accepted accounting principles (“US GAAP”) and the following accounting policies have been consistently applied in the preparation of the consolidated financial statements
Basis of Consolidation	(b) Basis of consolidation The consolidated financial statements include the accounts of the Company and its wholly-owned and non-wholly owned subsidiaries in which the Company has a controlling financial interest either through voting rights or means other than voting rights. All inter-company transactions and balances have been eliminated on consolidation. Where the Company’s ownership interest in a consolidated subsidiary is less than 100%, the non-controlling interests’ share of these non-wholly owned subsidiaries is reported in the Company’s consolidated balance sheets as a separate component of equity or within temporary equity. The non-controlling interests’ share of the net income of these non-wholly owned subsidiaries is reported in the Company’s consolidated income statements as a deduction from the Company’s net earnings to arrive at net income attributable to stockholders of the Company.  The Company consolidates variable interest entities (“VIEs”) if the Company has (a) the power to direct matters that most significantly impact the VIEs economic performance and (b) the obligation to absorb losses or the right to receive benefits of the VIE that could potentially be significant to the VIE. For VIEs where the Company has shared power with unrelated parties, the Company uses the equity method of accounting to report their results. The determination of the primary beneficiary involves judgment.
Revenue Recognition	(c) Revenue recognition Effective January 1, 2018, the Company adopted ASU 2014-09, Revenue from Contracts with Customers (Topic 606) using the full retrospective method, which included restating prior years for comparative amounts. This new accounting policy resulted in a change in the financial statement presentation only on the income statement, as described in Note 2 ( y ) New and amended accounting standards in this Annual Report on Form 10-K.  Revenues are comprised of: · Service revenues, including the following: i. Revenue from auction and marketplace (“A&M”) activities, including commissions earned at our live auctions, online marketplaces, and private brokerage services where we act as an agent for consignors of equipment and other assets, and various auction-related fees, including listing and buyer transaction fees; and 2. Significant accounting policies (c) Revenue recognition (continued) ii. Other services revenues, including revenues from listing services, refurbishment, logistical services, financing, appraisal fees and other ancillary service fees; and · Revenue from inventory sales as part of A&M activities The Company recognizes revenue when control of the promised goods or services is transferred to our customers, or upon completion of the performance obligation, in an amount that reflects the consideration we expect to be entitled to in exchange for those goods or services. A performance obligation is a promise in a contract to transfer a distinct good or service to the customer. A contract’s transaction price is allocated to each distinct performance obligation and recognized as revenue when, or as, the performance obligation is satisfied. For live event-based auctions or online auctions, revenue is recognized when the auction sale is complete and the Company has determined that the sale proceeds are collectible. Revenue is measured at the fair value of the consideration received or receivable and is shown net of value-added tax and duties.  Service revenues Commissions from sales at the Company’s auctions represent the percentage earned by the Company on the gross proceeds from equipment and other assets sold at auction. The majority of the Company’s commissions are earned as a pre-negotiated fixed rate of the gross selling price. Other commissions from sales at the Company’s auctions are earned from underwritten commission contracts, when the Company guarantees a certain level of proceeds to a consignor.  The Company accepts equipment and other assets on consignment stimulating buyer interest through professional marketing techniques, and matches sellers (also known as consignors) to buyers through the auction or private sale process. Prior to offering an item for sale on its online marketplaces, the Company also performs inspections.  Following the sale of the item, the Company invoices the buyer for the purchase price of the asset, taxes, and, if applicable, the buyer transaction fee, collects payment from the buyer, and remits the proceeds to the seller, net of the seller commissions, applicable taxes, and applicable fees. Commissions are calculated as a percentage of the hammer price of the property sold at auction. Fees are also charged to sellers for listing and inspecting equipment. Other revenues earned in the process of conducting the Company’s auctions include administrative, documentation, and advertising fees.  On the fall of the auctioneer’s hammer, the highest bidder becomes legally obligated to pay the full purchase price, which is the hammer price of the property purchased and the seller is legally obligated to relinquish the property in exchange for the hammer price less any seller’s commissions. Commission and fee revenues are recognized on the date of the auction sale upon the fall of the auctioneer’s hammer.  Under the standard terms and conditions of its auction sales, the Company is not obligated to pay a consignor for property that has not been paid for by the buyer, provided the property has not been released to the buyer. If the buyer defaults on its payment obligation, also referred to as a collapsed sale, the sale is cancelled in the period in which the determination is made, and the property is returned to the consignor or placed in a later event-based or online auction. Historically cancelled sales have not been material.  Online marketplace commission revenue is reduced by a provision for disputes, which is an estimate of disputed items that are expected to be settled at a cost to the Company, related to settlements of discrepancies under the Company’s equipment condition certification program. The equipment condition certification refers to a written inspection report provided to potential buyers that reflects the condition of a specific piece of equipment offered for sale, and includes ratings, comments, and photographs of the equipment following inspection by one of the Company’s equipment inspectors.  2. Significant accounting policies (c) Revenue recognition (continued) Service revenues (continued) The equipment condition certification provides that a buyer may file a written dispute claim during an eligible dispute period for consideration and resolution at the sole determination of the Company if the purchased equipment is not substantially in the condition represented in the inspection report. Typically disputes under the equipment condition certification program are settled with minor repairs or additional services, such as washing or detailing the item; the estimated costs of such items or services are included in the provision for disputes.  Commission revenues are recorded net of commissions owed to third parties, which are principally the result of situations when the commission is shared with a consignor or with the counterparty in an auction guarantee risk and reward sharing arrangement. Additionally, in certain situations, commissions are shared with third parties who introduce the Company to consignors who sell property at auction.  Underwritten commission contracts can take the form of guarantee contracts. Guarantee contracts typically include a pre-negotiated percentage of the guaranteed gross proceeds plus a percentage of proceeds in excess of the guaranteed amount. If actual auction proceeds are less than the guaranteed amount, commission is reduced; if proceeds are sufficiently lower, the Company can incur a loss on the sale. Losses, if any, resulting from guarantee contracts are recorded in the period in which the relevant auction is completed. If a loss relating to a guarantee contract held at the period end to be sold after the period end is known or is probable and estimable at the financial statement reporting date, the loss is accrued in the financial statements for that period. The Company’s exposure from these guarantee contracts fluctuates over time.  Other services revenue also includes fees for refurbishment, logistical services, financing, appraisal fees and other ancillary service fees. Fees are recognized in the period in which the service is provided to the customer.  Revenue on inventory sales Underwritten commission contracts can take the form of inventory contracts. Revenues related to inventory contracts are recognized in the period in which the sale is completed, title to the property passes to the purchaser and the Company has fulfilled any other obligations that may be relevant to the transaction. In its role as auctioneer, the Company auctions its inventory to equipment buyers through the auction process. Following the sale of the item, the Company invoices the buyer for the purchase price of the asset, taxes, and, if applicable, the buyer transaction fee, and collects payment from the buyer. On the fall of the auctioneer’s hammer, the highest bidder becomes legally obligated to pay the full purchase price, which is the hammer price of the property purchased. Title to the property is transferred in exchange for the hammer price, and if applicable, the buyer transaction fee plus applicable taxes.
Costs of Services	(d) Costs of services Costs of services are comprised of expenses incurred in direct relation to conducting auctions (“direct expenses”), earning online marketplace revenues, and earning other fee revenues. Direct expenses include direct labour, buildings and facilities charges, and travel, advertising and promotion costs.  Costs of services incurred to earn online marketplace revenues in addition to the costs listed above also include inspection costs. Inspections are generally performed at the seller’s physical location. The cost of inspections includes payroll costs and related benefits for the Company’s employees that perform and manage field inspection services, the related inspection report preparation and quality assurance costs, fees paid to contractors who perform field inspections, related travel and incidental costs for the Company’s inspection service organization, and office and occupancy costs for its inspection services personnel. Costs of earning online marketplace revenues also include costs for the Company’s customer support, online marketplace operations, logistics, title and lien investigation functions.  2. Significant accounting policies (continued) (d) Costs of services (continued) Costs of services incurred in earning other fee revenues include ancillary and logistical service expenses, direct labour (including commissions on sales), software maintenance fees, and materials. Costs of services exclude depreciation and amortization expenses.
Cost of Inventory Sold	(e) Cost of inventory sold Cost of inventory sold includes the purchase price of assets sold for the Company’s own account and is determined using a specific identification basis.
Share-Based Payments	(f) Share-based payments The Company classifies a share-based payment award as an equity or liability payment based on the substantive terms of the award and any related arrangement.  Equity-classified share-based payments Share unit plans The Company has a senior executive performance share unit (“PSU”) plan and an employee PSU plan that provides for the award of PSUs to certain senior executives and employees, respectively, of the Company. The Company has the option to settle certain share unit awards in cash or shares and expects to settle them in shares. The cost of PSUs granted is measured at the fair value of the underlying PSUs at the grant date using a Monte-Carlo simulation model. PSUs vest based on the passage of time and achievement of performance criteria.  The Company also has a senior executive restricted share unit (“RSU”) plan and an employee RSU plan that provides for the award of RSUs to certain senior executives and employees, respectively, of the Company. The Company has the option to settle certain share unit awards in cash or shares and expects to settle all grants on and after 2017 in shares. The cost of RSUs granted is measured using the volume weighted average price of the Company’s common shares for the twenty days prior to the grant date. RSUs vest based on the passage of time and include restrictions related to employment.  This fair value of awards expected to vest under these plans is expensed over the respective remaining service period of the individual awards, on an accelerated recognition basis, with the corresponding increase to APIC recorded in equity. At the end of each reporting period, the Company revises its estimate of the number of equity instruments expected to vest. The impact of the revision of the original estimates, if any, is recognized in earnings, such that the consolidated expense reflects the revised estimate, with a corresponding adjustment to equity. Dividend equivalents on the equity-classified PSUs and RSUs are recognized as a reduction to retained earnings over the service period.  At its August 2018 meeting, the Board of Directors resolved that, with respect to each of the RSU and PSU plans, there will no longer be a default in favour of cash settlement and, pursuant to the discretion granted under each plan, the Compensation Committee of the Board will determine whether to settle the awards in cash or in shares in the event of death of the participant. The Company intends to settle in shares. Prior to such resolution, the RSUs and PSUs awarded under the senior executive and employee PSU plans were intended to be settled in cash in the event of death of the participant, and as such, the contingently redeemable portion representing the amount that would be redeemable based on the conditions at the date of grant, to the extent attributable to prior service, was recognized as temporary equity. As a result of the resolution, that portion has been reclassified to additional paid in capital during the year. 2. Significant accounting policies (continued) (f) Share-based payments (continued) Stock option plans The Company has three stock option compensation plans that provide for the award of stock options to selected employees, directors and officers of the Company. The cost of options granted is measured at the fair value of the underlying option at the grant date using the Black-Scholes option pricing model. The fair value of options expected to vest under these plans is expensed over the respective remaining service period of the individual awards, on an accelerated recognition basis, with the corresponding increase to APIC recorded in equity. Upon exercise, any consideration paid on exercise of the stock options and amounts fully amortized in APIC are credited to the common shares.  Liability-classified share-based payments The Company maintains other share unit compensation plans that vest over a period of up to three years after grant. Under those plans, the Company is either required or expects to settle vested awards on a cash basis or by providing cash to acquire shares on the open market on the employee’s behalf, where the settlement amount is determined using the volume weighted average price of the Company’s common shares for the twenty days prior to the vesting date or, in the case of deferred share unit (“DSU”) recipients, following cessation of service on the Board of Directors.  These awards are classified as liability awards, measured at fair value at the date of grant and re-measured at fair value at each reporting date up to and including the settlement date. The determination of the fair value of the share units under these plans is described in note 25. The fair value of the awards is expensed over the respective vesting period of the individual awards with recognition of a corresponding liability. Changes in fair value after vesting are recognized through compensation expense. Compensation expense reflects estimates of the number of instruments expected to vest.  The impact of forfeitures and fair value revisions, if any, are recognized in earnings such that the cumulative expense reflects the revisions, with a corresponding adjustment to the settlement liability. Liability-classified share unit liabilities due within 12 months of the reporting date are presented in trade and other payables while settlements due beyond 12 months of the reporting date are presented in other non-current liabilities.
Fair Value Measurement	(g) Fair value measurement Fair value is the exit price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. The Company measures financial instruments or discloses select non-financial assets at fair value at each balance sheet date. Also, fair values of financial instruments measured at amortized cost are disclosed in note 13.  The Company uses valuation techniques that are appropriate in the circumstances and for which sufficient data is available to measure fair value, maximizing the use of relevant observable inputs and minimizing the use of unobservable inputs.  All assets and liabilities for which fair value is measured or disclosed in the financial statements at fair value are categorized within a fair value hierarchy, as disclosed in note 13, based on the lowest level input that is significant to the fair value measurement or disclosure. This fair value hierarchy gives the highest priority to quoted prices in active markets for identical assets or liabilities (Level 1) and the lowest priority to unobservable inputs (Level 3).  For assets and liabilities that are recognized in the financial statements at fair value on a recurring basis, the Company determines whether transfers have occurred between levels in the hierarchy by re-assessing categorization at the end of each reporting period.    2. Significant accounting policies (continued) (g) Fair value measurement (continued) For the purposes of fair value disclosures, the Company has determined classes of assets and liabilities on the basis of the nature, characteristics and risks of the assets or liability and the level of the fair value hierarchy as explained above.
Foreign Currency Translation	  (h) Foreign currency translation The parent entity‘s presentation and functional currency is the United States dollar. The functional currency for each of the parent entity‘s subsidiaries is the currency of the primary economic environment in which the entity operates, which is usually the currency of the country of residency.  Accordingly, the financial statements of the Company‘s subsidiaries that are not denominated in United States dollars have been translated into United States dollars using the exchange rate at the end of each reporting period for asset and liability amounts and the monthly average exchange rate for amounts included in the determination of earnings. Any gains or losses from the translation of asset and liability amounts are included in foreign currency translation adjustment in accumulated other comprehensive income.  In preparing the financial statements of the individual subsidiaries, transactions in currencies other than the entity‘s functional currency are recognized at the rates of exchange prevailing at the dates of the transaction. At the end of each reporting period, monetary assets and liabilities denominated in foreign currencies are retranslated at the rates prevailing at that date. Foreign currency differences arising on retranslation of monetary items are recognized in earnings. Foreign currency translation adjustment includes intra-entity foreign currency transactions that are of a long-term investment nature of $9,602,000 for 2018 (2017: $18,129,000 ; 2016: $1,967,000 ).
Cash and Cash Equivalents	(i) Cash and cash equivalents Cash and cash equivalents is comprised of cash on hand, deposits with financial institutions, and other short-term, highly liquid investments with original maturity of three months or less when acquired, that are readily convertible to known amounts of cash.
Restricted Cash	(j) Restricted cash In certain jurisdictions, local laws require the Company to hold cash in segregated bank accounts, which are used to settle auction proceeds payable resulting from live on site auctions and online marketplace sales conducted in those regions. In addition, the Company also holds cash generated from its online marketplace sales in separate escrow accounts, for settlement of the respective online marketplace transactions as a part of its secured escrow service. Restricted cash balances also include funds held in accounts owned by the Company in support of short-term stand-by letters of credit to provide seller security.  During the period from December 21, 2016 through May 31, 2017, non-current restricted cash consisted of funds held in escrow pursuant to the offering of senior unsecured notes (note 22), which were only available when the Company received approval to acquire IronPlanet Holdings, Inc. (“IronPlanet”) and whose use was restricted to the funding of the IronPlanet acquisition (note 29).
Trade and Other Receivables	(k) Trade and other receivables Trade receivables principally include amounts due from customers as a result of live on site auction and online marketplace transactions. The recorded amount reflects the purchase price of the item sold, including the Company’s commission. The allowance for doubtful accounts is the Company’s best estimate of the amount of probable credit losses in existing accounts receivable. The Company determines the allowance based on historical write-off experience and customer economic data. The Company reviews the allowance for doubtful accounts regularly and past due balances are reviewed for collectability. Account balances are charged against the allowance when the Company believes that the receivable will not be recovered.
Inventories	(l) Inventories Inventory consists of equipment and other assets purchased for resale in an upcoming live on site auction or online marketplace event. The Company typically purchases inventory for resale through a competitive process where the consignor or vendor has determined this to be the preferred method of disposition through the auction process. In addition, certain jurisdictions require auctioneers to hold title to assets and facilitate title transfer on sale. Inventory is valued at the lower of cost and net realizable value where net realizable value represents the expected sale price upon disposition less make-ready costs and the costs of disposal and transportation. As part of its government business, the Company purchases inventory for resale as part of its commitment to purchase certain surplus government property (note 26). The significant elements of cost include the acquisition price of the inventory and make-ready costs to prepare the inventory for sale that are not selling expenses and in-bound transportation costs. Write-downs to the carrying value of inventory are recorded in cost of inventory sold on the consolidated income statement.
Equity-Accounted Investments	(m) Equity-accounted investments Investments in entities that the Company has the ability to exercise significant influence over, but not control, are accounted for using the equity method of accounting. Under the equity method of accounting, investments are stated at initial costs and are adjusted for subsequent additional investments and the Company’s share of earnings or losses and distributions. The Company evaluates its equity-accounted investments for impairment when events or circumstances indicate that the carrying value of such investments may have experienced an other-than-temporary decline in value below their carrying value. If the estimated fair value is less than the carrying value and is considered an other than temporary decline, the carrying value is written down to its estimated fair value and the resulting impairment is recorded in the consolidated income statement.
Property, Plant and Equipment	(n) Property, plant and equipment All property, plant and equipment are stated at cost less accumulated depreciation. Cost includes all expenditures that are directly attributable to the acquisition or development of the asset, net of any amounts received in relation to those assets, including scientific research and experimental development tax credits.  The cost of self-constructed assets includes the cost of materials and direct labour, any other costs directly attributable to bringing the assets to working condition for their intended use, the costs of dismantling and removing items and restoring the site on which they are located (if applicable), and capitalized interest on qualifying assets. Subsequent costs are included in the asset’s carrying amount or recognized as a separate asset, as appropriate, only when it is probable that future economic benefits associated with the item will flow to the Company and the cost of the item can be measured reliably.  All repairs and maintenance costs are charged to earnings during the financial period in which they are incurred. Gains and losses on disposal of an item of property, plant and equipment are determined by comparing the proceeds from disposal with the carrying amount of the item, and are recognized net within operating income on the income statement.  Depreciation is provided to charge the cost of the assets to operations over their estimated useful lives based on their usage as follows:   Asset Rate / term  Land improvements 10% Buildings 15 - 30 years Yard equipment 20 - 30%  Automotive equipment 30% Computer software and equipment 3 - 5 years  Office equipment 20% Leasehold improvements Lease term 2. Significant accounting policies (continued) (n) Property, plant and equipment (continued) No depreciation is provided on freehold land or on assets in the course of construction or development. Depreciation of property, plant and equipment under capital leases is recorded in depreciation expense.  Legal obligations to retire and to restore property, plant and equipment and assets under operating leases are recorded at management‘s best estimate in the period in which they are incurred, if a reasonable estimate can be made, with a corresponding increase in asset carrying value. The liability is accreted to face value over the remaining estimated useful life of the asset. The Company does not have any significant asset retirement obligations.
Long-lived Assets Held for Sale	(o) Long-lived assets held for sale Long-lived assets, or disposal groups comprising assets and liabilities, that are expected to be recovered primarily through sale rather than through continuing use are classified as assets held for sale. Immediately before classification as held for sale, the assets, or components of a disposal group, are measured at carrying amount in accordance with the Company’s accounting policies. Thereafter, the assets, or disposal group, are measured at the lower of their carrying amount and fair value less cost to sell and are not depreciated. Impairment losses on initial classification as held for sale and subsequent gains or losses on re-measurement are recognized in operating income on the income statement.
Intangible Assets	(p) Intangible assets Intangible assets are measured at cost less accumulated amortization and accumulated impairment losses. Cost includes all expenditures that are directly attributable to the acquisition or development of the asset, net of any amounts received in relation to those assets, including scientific research and experimental development tax credits. Costs of internally developed software are amortized on a straight-line basis over the remaining estimated economic life of the software product. Costs related to software incurred prior to establishing technological feasibility or the beginning of the application development stage of software are charged to operations as such costs are incurred. Once technological feasibility is established or the application development stage has begun, directly attributable costs are capitalized until the software is available for use.  Amortization is recognized in net earnings on a straight-line basis over the estimated useful lives of intangible assets from the date that they are available for use. The estimated useful lives are:    Asset Basis Rate / term  Trade names and trademarks Straight-line 3 - 15 years or indefinite-lived  Customer relationships Straight-line 6 - 20 years  Software assets Straight-line 3 - 7 years  Customer relationships includes relationships with buyers and sellers.
Impairment of Long-lived and Indefinite-lived Assets	(q) Impairment of long-lived and indefinite-lived assets Long-lived assets, comprised of property, plant and equipment and intangible assets subject to amortization, are assessed for impairment whenever events or circumstances indicate that their carrying value may not be recoverable. For the purpose of impairment testing, long-lived assets are grouped and tested for recoverability at the lowest level that generates independent cash flows. An impairment loss is recognized when the carrying value of the assets or asset groups is greater than the future projected undiscounted cash flows. The impairment loss is calculated as the excess of the carrying value over the fair value of the asset or asset group. Fair value is based on valuation techniques or third party appraisals. Significant estimates and judgments are applied in determining these cash flows and fair values. 2. Significant accounting policies (continued) (q) Impairment of long-lived and indefinite-lived assets (continued) Indefinite-lived intangible assets are tested annually for impairment as of December 31, and between annual tests if indicators of potential impairment exist. The Company has the option of performing a qualitative assessment to first determine whether the quantitative impairment test is necessary. This involves an assessment of qualitative factors to determine the existence of events or circumstances that would indicate whether it is more likely than not that the carrying amount of the indefinite-lived intangible asset is less than its fair value. If the qualitative assessment indicates it is not more likely than not that the carrying amount is less than its fair value, a quantitative impairment test is not required. Where a quantitative impairment test is required, the procedure is to compare the indefinite-lived intangible asset’s fair value with its carrying amount. An impairment loss is recognized as the difference between the indefinite-lived intangible asset’s carrying amount and its fair value.
Goodwill	(r) Goodwill Goodwill represents the excess of the purchase price of an acquired enterprise over the fair value assigned to the assets acquired and liabilities assumed in a business combination.  Goodwill is not amortized, but it is tested annually for impairment at the reporting unit level as of December 31, and between annual tests if indicators of potential impairment exist. The Company has the option of performing a qualitative assessment of a reporting unit to first determine whether the quantitative impairment test is necessary. This involves an assessment of qualitative factors to determine the existence of events or circumstances that would indicate whether it is more likely than not that the carrying amount of the reporting unit to which goodwill belongs is less than its fair value. If the qualitative assessment indicates it is not more likely than not that the reporting unit’s carrying amount is less than its fair value, a quantitative impairment test is not required. If a quantitative impairment test is required, the procedure is to identify potential impairment by comparing the reporting unit’s fair value with its carrying amount, including goodwill. The reporting unit’s fair value is determined using various valuation approaches and techniques that involve assumptions based on what the Company believes a hypothetical marketplace participant would use in estimating fair value on the measurement date. An impairment loss is recognized as the difference between the reporting unit’s carrying amount and its fair value. If the difference between the reporting unit’s carrying amount and fair value is greater than the amount of goodwill allocated to the reporting unit, the impairment loss is restricted by the amount of the goodwill allocated to the reporting unit.
Deferred Financing Costs	(s) Deferred financing costs Deferred financing costs represent the unamortized costs incurred on the issuance of the Company’s long-term debt. Amortization of deferred financing costs is provided on the effective interest rate method over the term of the facility. Deferred financing costs relating to the Company’s term debt are presented in the consolidated balance sheet as a direct reduction of the carrying amount of the long-term debt. Deferred financing costs relating to the Company’s revolving loans are presented on the balance sheet as a deferred charge.
Taxes	(t) Taxes Income tax expense represents the sum of current tax expense and deferred tax expense.  Current tax The current tax expense is based on taxable profit for the period and includes any adjustments to tax payable in respect of previous years. Taxable profit differs from income before income taxes as reported in the consolidated income statement because it excludes (i) items of income or expense that are taxable or deductible in other years and (ii) items that are never taxable or deductible. The Company‘s liability for current tax is calculated using tax rates that have been enacted by the balance sheet date.  2. Significant accounting policies (continued) (t) Taxes (continued) Deferred tax Income taxes are accounted for using the asset and liability method. Deferred income tax assets and liabilities are based on temporary differences, which are differences between the accounting basis and the tax basis of the assets and liabilities and non-capital loss, capital loss, and tax credits carryforwards are measured using the enacted tax rates and laws expected to apply when these differences reverse. Deferred tax benefits, including non-capital loss, capital loss, and tax credits carryforwards, are recognized to the extent that realization of such benefits is considered more likely than not. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in earnings in the period that enactment occurs. When realization of deferred income tax assets does not meet the more-likely-than-not criterion for recognition, a valuation allowance is provided. Interest and penalties related to income taxes, including unrecognized tax benefits, are recorded in income tax expense in the income statement.  Liabilities for uncertain tax positions are recorded based on a two-step process. The first step is to evaluate the tax position for recognition by determining if the weight of available evidence indicates that it is more likely than not that the position will be sustained on audit, including resolution of related appeals or litigation processes, if any. The second step is to measure the tax benefit as the largest amount that is more than 50% likely of being realized upon settlement. The Company regularly assesses the potential outcomes of examinations by tax authorities in determining the adequacy of its provision for income taxes. The Company continually assesses the likelihood and amount of potential adjustments and adjusts the income tax provision, income taxes payable, and deferred taxes in the period in which the facts that give rise to a revision become known.
Contingently Redeemable Non-controlling Interest	(u) Contingently redeemable non-controlling interest Contingently redeemable equity instruments are initially recorded at their fair value on the date of issue within temporary equity on the balance sheet. When the equity instruments become redeemable or redemption is probable, the Company recognizes changes in the estimated redemption value immediately as they occur, and adjusts the carrying amount of the redeemable equity instrument to equal the estimated redemption value at the end of each reporting period. Changes to the carrying value are charged or credited to retained earnings attributable to stockholders on the balance sheet.  Redemption value determinations require high levels of judgment (“Level 3” on the fair value hierarchy) and are based on various valuation techniques, including market comparables and discounted cash flow projections.
Earnings Per Share	(v) Earnings per share Basic earnings per share has been calculated by dividing net income attributable to stockholders by the weighted average number of common shares outstanding. Diluted earnings per share has been calculated after giving effect to outstanding dilutive stock options calculated by adjusting the net income attributable to stockholders and the weighted average number of shares outstanding for all dilutive shares.
Defined Contribution Plans	(w) Defined contribution plans The employees of the Company are members of retirement benefit plans to which the Company matches up to a specified percentage of employee contributions or, in certain jurisdictions, contributes a specified percentage of payroll costs as mandated by the local authorities. The only obligation of the Company with respect to the retirement benefit plans is to make the specified contributions.
Advertising Costs	(x) Advertising costs Advertising costs are expensed as incurred. Advertising expense is included in costs of services and selling, general and administrative (“SG&A”) expenses on the accompanying consolidated income statements.
New and Amended Accounting Standards & Recent Accounting Standards Not Yet Adopted	(y) New and amended accounting standards (i) Effective January 1, 2018, the Company adopted ASU 2014-09, Revenue from Contracts with Customers (Topic 606). The Company implemented the new standard using a full retrospective method, in order to provide more useful comparative information to financial statement users.  The primary impact of the adoption of ASU 2014-09 is the change in the presentation of revenue from inventory, ancillary service, and logistical services contracts on a gross basis as a principal versus net as an agent. This is due to the new standard requiring an entity to determine whether the entity controls the specified good or service before transfer to the customer, with the entity being principal in these transactions. Prior to adopting ASU 2014-09, an entity evaluated indicators to determine if it was a principal or agent. As the Company determined that it controls the inventory and provision of ancillary and logistical services before transfer to its customers, the Company concluded that it was acting as a principal rather than an agent. As a result of adoption of the new accounting standard t here was no impact on the timing of recognition of revenue, operating income, net income, or on the consolidated balance sheet or consolidated statement of cash flows.  Presenting revenue from inventory sales on a gross basis and presenting ancillary and logistical services revenues on a gross basis significantly changes the face of the Company’s consolidated income statement in two primary ways: 1) Prior to the adoption of ASU 2014-09, all revenue from inventory sales were presented net of costs within service revenues on the income statement. With the adoption of ASU 2014-09, the Company has presented separately revenue from inventory sales and service revenue and accordingly service revenues exclude revenue from inventory sales and cost of inventory sold. Those amounts are now presented gross as separate line items on the face of the consolidated income statement; and 2) Ancillary and logistical service revenues are presented within service revenues, now on a gross basis, with the related costs of services presented separately within costs of services. 2. Significant accounting policies (continued) (y) New and amended accounting standards (continued) Impact to reported results The new presentation based on ASU 2014-09 results in an increase the amount of revenue reported but there is no change in the operating income compared to the prior presentation:    Year ended December 31, 2017  Consolidated income statement line item As reported New Revenue Standard Adjustment Consolidated income statement line item As Adjusted  Revenues $ 610,517 $ 13,900 Service revenues $ 624,417  346,774 Revenue from inventory sales 346,774  360,674 Total revenues 971,191  Costs of services (79,013) (54,176) Costs of services (133,189)  (306,498) Cost of inventory sold (306,498)  $ 531,504 $ - $ 531,504     Year ended December 31, 2016  Consolidated income statement line item As reported New Revenue Standard Adjustment Consolidated income statement line item As Adjusted  Revenues $ 566,395 $ (10,552) Service revenues $ 555,843  571,134 Revenue from inventory sales 571,134  560,582 Total revenues 1,126,977  Costs of services (66,062) (47,234) Costs of services (113,296)  (513,348) Cost of inventory sold (513,348)  $ 500,333 $ - Gross profit $ 500,333  (ii) Effective January 1, 2018 , the Company adopted ASU 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments . ASU 2016-15 identifies how certain cash receipts and cash payments are presented and classified in the statement of cash flows. The amendments are applied retrospectively on the amendment date. The adoption of ASU 2016-15 resulted in the $1,302,000 Mascus contingent consideration paid in the second quarter of 2017 to be reclassified from operating to financing cash flows.  (z) Recent accounting standards not yet adopted In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842) , which requires lessees to recognize almost all leases, including operating leases, on the balance sheet through a right-of-use asset and a corresponding lease liability. For short-term leases, defined as those with a term of 12 months or less, the lessee is permitted to make an accounting policy election not to recognize the lease assets and liabilities, and instead recognize the lease expense generally on a straight-line basis over the lease term. The accounting treatment under this election is consistent with current operating lease accounting. No extensive amendments were made to lessor accounting, but amendments of note include changes to the definition of initial direct costs and accounting for collectability uncertainties in a lease.  2. Significant accounting policies (continued) (z) Recent accounting standards not yet adopted (continued) ASU 2016-02 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018, with early adoption permitted. The Company plans to adopt the standard effective January 1, 2019. In July 2018, the FASB issued ASU 2018-11, Leases (Topic 842): Targeted Improvements , which provides an “optional transition method”. The Company can transition to the new standard by using a “modified retrospective transition”, which reflects the new guidance from the beginning of the earliest period presented in the financial statements or the “optional transition method”, which permits the Company to apply the new lease standard at the adoption date and recognize a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. If the optional transition method is utilized, the Company’s reporting for the comparative periods presented in the financial statements in which it adopts Topic 842 will continue to be reported pursuant to Topic 840. The Company has determined that it will utilize the optional transition method on adoption .  The Company will utilize the package of practical expedients permitted within the new standard, which among other things, allows the Company to carryforward the historical lease classification. In addition, the Company will elect the hindsight practical expedient to determine the reasonably certain lease term for existing leases. While lease classification will remain unchanged, hindsight will result in generally longer accounting lease terms and useful lives of the corresponding leasehold improvements. The Company will elect not to recognize the lease assets and liabilities for leases with an initial term of 12 months or less and will recognize those lease payments on a straight-line basis over the lease term.  The Company is currently completing the implementation of its lease accounting system. We continue to assess the accuracy and completeness of lease data and validate internal controls. We are finalizing our assessment of the potential impact of the standard and we expect a significant increase in total liabilities with an offsetting increase to the right-of-use asset relating to operating leases. The Company does not believe the standard will materially affect our consolidated net earnings. We do not expect the standard to impact our debt-covenant compliance under our current agreements.

Significant Accounting Polici_3

Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2018
Significant Accounting Policies [Abstract]
Depreciation of Assets Based on Usage	  Asset Rate / term  Land improvements 10% Buildings 15 - 30 years Yard equipment 20 - 30%  Automotive equipment 30% Computer software and equipment 3 - 5 years  Office equipment 20% Leasehold improvements Lease term 
Amortization of Intangible Assets	   Asset Basis Rate / term  Trade names and trademarks Straight-line 3 - 15 years or indefinite-lived  Customer relationships Straight-line 6 - 20 years  Software assets Straight-line 3 - 7 years 
Schedule of Adoption of New Accounting Pronouncements	    Year ended December 31, 2017  Consolidated income statement line item As reported New Revenue Standard Adjustment Consolidated income statement line item As Adjusted  Revenues $ 610,517 $ 13,900 Service revenues $ 624,417  346,774 Revenue from inventory sales 346,774  360,674 Total revenues 971,191  Costs of services (79,013) (54,176) Costs of services (133,189)  (306,498) Cost of inventory sold (306,498)  $ 531,504 $ - $ 531,504     Year ended December 31, 2016  Consolidated income statement line item As reported New Revenue Standard Adjustment Consolidated income statement line item As Adjusted  Revenues $ 566,395 $ (10,552) Service revenues $ 555,843  571,134 Revenue from inventory sales 571,134  560,582 Total revenues 1,126,977  Costs of services (66,062) (47,234) Costs of services (113,296)  (513,348) Cost of inventory sold (513,348)  $ 500,333 $ - Gross profit $ 500,333  (ii) Effective January 1, 2018 , the Company adopted ASU 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments . ASU 2016-15 identifies how certain cash receipts and cash payments are presented and classified in the statement of cash flows. The amendments are applied retrospectively on the amendment date. The adoption of ASU 2016-15 resulted in the $1,302,000 Mascus contingent consideration paid in the second quarter of 2017 to be reclassified from operating to financing cash flows.

Segmented Information (Tables)

Segmented Information (Tables)	12 Months Ended
	Dec. 31, 2018
Segmented Information [Abstract]
Schedule of Revenue and (Loss) Income Before Taxes by Segment	   Year ended December 31, 2018  A&M Other Consolidated  Service revenues $ 626,007 $ 123,508 $ 749,515  Revenue from inventory sales 420,511 - 420,511  Total revenues $ 1,046,518 $ 123,508 $ 1,170,026  Costs of services 87,430 71,628 159,058  Cost of inventory sold 374,339 - 374,339  Selling, general and administrative  expenses ("SG&A") 363,549 19,127 382,676  Segment profit $ 221,200 $ 32,753 $ 253,953  Acquisition-related costs 5,093  Depreciation and amortization  expenses ("D&A") 66,614  Gain on disposition of property, plant  and equipment ("PPE") (2,731)  Foreign exchange gain (212)  Operating income $ $ $ 185,189  Interest expense (44,527)  Other income, net 11,850  Income tax expense (31,006)  Net income $ $ $ 121,506 4. Segmented information (continued)    Year ended December 31, 2017  A&M Other Consolidated  Service revenues $ 524,023 $ 100,394 $ 624,417  Revenue from inventory sales 346,774 - 346,774  Total revenues $ 870,797 $ 100,394 971,191  Costs of services 75,685 57,504 133,189  Cost of inventory sold 306,498 - 306,498  SG&A expenses 308,873 14,397 323,270  Impairment loss 8,911 - 8,911  Segment profit $ 170,830 $ 28,493 $ 199,323  Acquisition-related costs 38,272  D&A expenses 52,694  Gain on disposition of PPE (1,656)  Foreign exchange loss 2,559  Operating income $ 107,454  Interest expense (38,291)  Other income, net 8,231  Income tax expense (2,088)  Net income $ 75,306 4. Segmented information (continued)    Year ended December 31, 2016  A&M Other Consolidated  Service revenues $ 474,040 81,803 $ 555,843  Revenue from inventory sales 571,134 - 571,134  Total revenues $ 1,045,174 $ 81,803 1,126,977  Costs of services 65,248 48,048 113,296  Cost of inventory sold 513,348 - 513,348  SG&A expenses 272,317 11,212 283,529  Impairment loss 28,243 - 28,243  Segment profit $ 166,018 $ 22,543 $ 188,561  Acquisition-related costs 11,829  D&A expenses 40,861  Gain on disposition of PPE (1,282)  Foreign exchange loss 1,431  Operating income $ 135,722  Interest expense (5,564)  Debt extinguishment costs (6,787)  Other income, net 7,123  Income tax expense (36,982)  Net income $ 93,512 
Schedule of Carrying Value Goodwill	   As at December 31, 2018 2017  A&M $ 651,359 $ 649,770  Other 20,235 21,152  $ 671,594 $ 670,922 
Geographic Information of Revenue	   United States Canada Europe Other Consolidated  Total revenues for the year ended:  December 31, 2018 $ 548,695 $ 284,989 $ 180,817 $ 155,525 $ 1,170,026  December 31, 2017 452,599 245,106 127,706 145,780 971,191  December 31, 2016 555,837 293,956 109,024 168,160 1,126,977 
Geographic Information of Long-lived Assets	   United States Canada Europe Other Consolidated  Long-lived assets:  December 31, 2018 $ 260,489 $ 100,983 $ 77,496 $ 47,631 $ 486,599  December 31, 2017 275,628 116,833 82,795 51,325 526,581  

Revenues (Tables)

Revenues (Tables)	12 Months Ended
	Dec. 31, 2018
Revenues [Abstract]
Revenue from the Rendering of Services	   Year ended December 31, 2018 2017 2016  Service revenues:  Commissions $ 420,160 $ 394,397 $ 366,342  Fees 329,355 230,020 189,501  749,515 624,417 555,843  Revenue from inventory sales 420,511 346,774 571,134  $ 1,170,026 $ 971,191 $ 1,126,977 

Operating Expenses (Tables)

Operating Expenses (Tables)	12 Months Ended
	Dec. 31, 2018
Operating Expenses [Abstract]
Schedule of Direct Operating Expenses	   Year ended December 31, 2018 2017 2016  Ancillary and logistical service expenses $ 66,576 $ 54,176 $ 47,234  Employee compensation expenses 41,391 35,440 27,856  Buildings, facilities and technology expenses 9,477 8,359 7,966  Travel, advertising and promotion expenses 27,606 23,994 23,688  Other costs of services 14,008 11,220 6,552  $ 159,058 $ 133,189 $ 113,296 
Schedule of Selling, General and Administrative Expenses	   Year ended December 31, 2018 2017 2016  Employee compensation expenses $ 249,115 $ 208,370 $ 180,929  Buildings, facilities and technology expenses 60,930 53,151 49,219  Travel, advertising and promotion expenses 36,728 30,440 24,384  Professional fees 16,768 13,522 13,344  Other SG&A expenses 19,135 17,787 15,653  $ 382,676 $ 323,270 $ 283,529 
Schedule of Acquisition Related Costs	   Year ended December 31, 2018 2017 2016  IronPlanet:  Other acquisition-related costs $ 2,944 $ 34,653 $ 8,202  Other acquisitions:  Continuing employment costs 2,091 3,418 2,491  Other acquisition-related costs 58 201 1,136  $ 5,093 $ 38,272 $ 11,829  
Schedule of Depreciation and Amortization Expenses	   Year ended December 31, 2018 2017 2016  Depreciation expense $ 29,021 $ 28,337 $ 30,983  Amortization expense 37,593 24,357 9,878  $ 66,614 $ 52,694 $ 40,861 

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2018
Income Taxes [Abstract]
Schedule of Effective Income Tax Rate Reconciliation	   Year ended December 31, 2018 2017 2016  Income before income taxes $ 152,512 $ 77,394 $ 130,494  Statutory federal and provincial tax  rate in Canada 27.00% 26.00% 26.00%   Expected income tax expense $ 41,178 $ 20,122 $ 33,928   Non-deductible expenses 4,810 5,668 3,891  Adjustment to prior year provision to statutory  tax returns 1,323 (528) (824)  Changes in the valuation of deferred tax assets (771) (1,089) (259)  Different tax rates of subsidiaries  operating in foreign jurisdictions (17,145) (12,269) (3,786)  U.S. tax reform impacts 4,899 (9,734) -  Impairment of goodwill - - 6,129  Change in estimate of deductibility  of stock options - (1,557) -  Unrecognized tax benefits (1,800) 3,291 799  Benefits of deductible stock options vested  and exercised (2,434) (1,359) (1,042)  Deductions for tax purposes in excess of  accounting expenses (383) (380) (490)  Other 1,329 (77) (1,364)  $ 31,006 $ 2,088 $ 36,982 
Summary of Income Tax Expense (Recovery)	   Year ended December 31, 2018 2017 2016  Canadian:  Current tax expense $ 13,209 30,525 $ 14,245 $ 30,525  Deferred tax expense (recovery) 3,958 (10,192) (2,068)   Foreign:  Current tax expense before application  of operating loss carryforwards 19,851 8,987 12,126  Tax benefit of operating loss carryforwards (8,293) (3,876) (2,310)  Total foreign current tax expense 11,558 5,111 9,816   Deferred tax expense before adjustment  to opening valuation allowance 2,386 (6,317) (1,291)  Adjustment to opening valuation allowance (105) (759) -  Total foreign deferred tax expense (recovery) 2,281 (7,076) (1,291)  $ 31,006 $ 2,088 $ 36,982 
Schedule of Deferred Tax Assets and Liabilities	   As at December 31, 2018 2017  Deferred tax assets:  Working capital $ 4,703 $ 9,583  Property, plant and equipment 6,385 6,495  Goodwill - 1,016  Share-based compensation 4,923 5,733  Tax losses and tax credit carryforwards 48,881 52,251  Other 14,844 7,635  79,736 82,713  Deferred tax liabilities:  Property, plant and equipment $ (10,918) $ (9,779)  Goodwill (8,390) (9,202)  Intangible assets (54,810) (54,401)  Other (12,051) (8,628)  (86,169) (82,010)  Net deferred tax assets (liabilities) $ (6,433) $ 703   Valuation allowance (13,438) (14,363)  $ (19,871) $ (13,660) 
Schedule of Non-capital Loss Carryforwards	   2019 $ 106  2020 4,232  2021 5,017  2022 3,543  2023 and thereafter 154,593  $ 167,491 
Schedule of Unrecognized Tax Benefits	   As at December 31, 2018 2017  Unrecognized tax benefits, beginning of year $ 25,910 $ 19,262  Increases - tax positions taken in prior period 725 4,426  Decreases - tax positions taken in prior period (107) (124)  Increases - tax positions taken in current period 2,644 2,346  Settlement and lapse of statute of limitations (4,944) -  Currency translation adjustment (1,644) -  Unrecognized tax benefits, end of year $ 22,584 $ 25,910 

Earnings Per Share Attributab_2

Earnings Per Share Attributable to Stockholders (Tables)	12 Months Ended
	Dec. 31, 2018
Earnings Per Share Attributable to Stockholders [Abstract]
Computation of Basic and Diluted Earnings Per Share	    Net income WA  attributable to number Per share  Year ended December 31, 2018 stockholders of shares amount  Basic $ 121,479 108,063,349 $ 1.12  Effect of dilutive securities:  Share units - 459,503 -  Stock options - 865,384 (0.01)  Diluted $ 121,479 109,388,236 $ 1.11      Net income WA  attributable to number Per share  Year ended December 31, 2017 stockholders of shares amount  Basic $ 75,027 107,044,348 $ 0.70  Effect of dilutive securities:  Share units (152) 353,880 -  Stock options - 714,923 (0.01)  Diluted $ 74,875 108,113,151 $ 0.69     Net income WA  attributable to number Per share  Year ended December 31, 2016 stockholders of shares amount  Basic $ 91,832 106,630,323 $ 0.86  Effect of dilutive securities:  Share units 91,997 -  Stock options - 735,474 (0.01)  Diluted $ 91,832 107,457,794 $ 0.85 

Supplemental Cash Flow Inform_2

Supplemental Cash Flow Information (Tables)	12 Months Ended
	Dec. 31, 2018
Supplemental Cash Flow Information [Abstract]
Schedule of Net Changes in Operating Assets and Liabilities	   Year ended December 31, 2018 2017 2016  Trade and other receivables $ (43,341) $ (19,161) $ 6,419  Inventory (77,292) (8,557) 26,557  Advances against auction contracts (8,266) 3,246 (1,012)  Prepaid expenses and deposits 646 1,178 (7,443)  Income taxes receivable 13,053 (6,067) (10,686)  Auction proceeds payable 8,768 25,783 550  Trade and other payables 39,531 21,854 5,627  Income taxes payable 1,954 (3,986) (8,657)  Share unit liabilities 1,070 (5,421) 4,503  Other (1,673) 1,410 (5,176)  Net changes in operating  assets and liabilities $ (65,550) $ 10,279 $ 10,682 
Schedule of Supplemental Cash Flow	   Year ended December 31, 2018 2017 2016  Interest paid, net of interest capitalized $ 39,429 $ 23,360 $ 5,792  Interest received 2,888 3,196 1,861  Net income taxes paid 10,352 28,281 54,037   Non-cash purchase of property, plant  and equipment under capital lease $ 8,968 $ 8,820 $ 3,376 
Schedule of Cash, Cash Equivalents and Restricted Cash	   2018 2017 2016  Cash and cash equivalents $ 237,744 $ 267,910 $ 207,867  Restricted cash 67,823 63,206 550,222  Cash, cash equivalents, and restricted cash $ 305,567 $ 331,116 $ 758,089 

Fair Value Measurement (Tables)

Fair Value Measurement (Tables)	12 Months Ended
	Dec. 31, 2018
Fair Value Measurement [Abstract]
Fair Value Assets Recurring and Nonrecurring	   December 31, 2018 December 31, 2017  Category Carrying amount Fair value Carrying amount Fair value  Fair values disclosed:  Cash and cash equivalents Level 1 $ 237,744 $ 237,744 $ 267,910 $ 267,910  Restricted cash Level 1 67,823 67,823 63,206 63,206  Short-term debt Level 2 19,896 19,896 7,018 7,018  Long-term debt  Senior unsecured notes Level 1 489,136 487,813 487,339 520,000  Term loans Level 2 222,162 224,582 325,553 329,687 

Trade and Other Receivables (Ta

Trade and Other Receivables (Tables)	12 Months Ended
	Dec. 31, 2018
Trade and Other Receivables [Abstract]
Schedule of Trade and Other Receivables	   As at December 31, 2018 2017  Trade receivables $ 112,680 $ 77,870  Consumption taxes receivable 16,099 13,592  Other receivables 478 643  $ 129,257 $ 92,105 

Other Current Assets (Tables)

Other Current Assets (Tables)	12 Months Ended
	Dec. 31, 2018
Other Current Assets [Abstract]
Schedule of Other Current Assets	   As at December 31, 2018 2017  Advances against auction contracts $ 15,558 $ 7,336  Assets held for sale 15,051 584  Prepaid expenses and deposits 18,446 19,690  $ 49,055 $ 27,610 
Summary of Assets Held For Sale	   Balance, December 31, 2016 $ 632  Site preparation costs 25  Reclassified from property, plant and equipment 411  Disposal (484)  Balance, December 31, 2017 584  Reclassified from property, plant and equipment 20,610  Disposal (6,143)  Balance, December 31, 2018 $ 15,051 

Property, Plant and Equipment (

Property, Plant and Equipment (Tables)	12 Months Ended
	Dec. 31, 2018
Property, Plant and Equipment [Abstract]
Schedule of Property, Plant and Equipment	   As at December 31, 2018 Cost Accumulated depreciation Net book value  Land and improvements $ 362,781 $ (72,547) $ 290,234  Buildings 252,182 (106,959) 145,223  Yard and automotive equipment 57,983 (36,640) 21,343  Computer software and equipment 70,623 (60,258) 10,365  Office equipment 28,490 (19,582) 8,908  Leasehold improvements 19,735 (16,240) 3,495  Assets under development 7,031 - 7,031  $ 798,825 $ (312,226) $ 486,599     As at December 31, 2017 Cost Accumulated depreciation Net book value  Land and improvements $ 379,546 $ (68,706) $ 310,840  Buildings 267,334 (103,544) 163,790  Yard and automotive equipment 58,209 (38,126) 20,083  Computer software and equipment 69,718 (60,451) 9,267  Office equipment 25,430 (18,745) 6,685  Leasehold improvements 21,467 (15,090) 6,377  Assets under development 9,539 - 9,539  $ 831,243 $ (304,662) $ 526,581 

Other Non-current Assets (Table

Other Non-current Assets (Tables)	12 Months Ended
	Dec. 31, 2018
Other Non-current Assets [Abstract]
Schedule of Other Non-current Assets	   As at December 31, 2018 2017  Tax receivable $ 12,705 $ 12,851  Deferred debt issue costs 2,017 3,768  Equity-accounted investments 4,010 7,408  Other 10,663 7,527  $ 29,395 $ 31,554 
Summary of Investments	   Ownership December 31, December 31,  percentage 2018 2017  Cura Classis entities 48% $ 4,010 $ 4,720  Other equity investments 32% - 2,688  4,010 7,408 

Intangible Assets (Tables)

Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2018
Goodwill and Intangible Assests [Abstract]
Schedule of Indefinite-Lived and Definite-Lived Intangible Assets	   As at December 31, 2018 Cost Accumulated amortization Net book value  Trade names and trademarks $ 53,409 $ (1,201) $ 52,208  Customer relationships 124,986 (22,010) 102,976  Software 127,320 (48,522) 78,798  Software under development 11,640 - 11,640  $ 317,355 $ (71,733) $ 245,622        19. Intangible assets (continued)     As at December 31, 2017 Cost Accumulated amortization Net book value  Trade names and trademarks $ 53,566 $ (461) $ 53,105  Customer relationships 125,234 (9,487) 115,747  Software 110,201 (26,898) 83,303  Software under development 8,939 - 8,939  $ 297,940 $ (36,846) $ 261,094 
Schedule of Annual Amortization Expense	   2019 $ 35,651  2020 28,801  2021 23,303  2022 20,727  2023 16,567  $ 125,049 

Goodwill (Tables)

Goodwill (Tables)	12 Months Ended
	Dec. 31, 2018
Goodwill and Intangible Assests [Abstract]
Schedule of Goodwill	   Balance, December 31, 2016 $ 97,537  Additions 568,936  Foreign exchange movement 4,449  Balance, December 31, 2017 $ 670,922  Additions 3,671  Foreign exchange movement (2,999)  Balance, December 31, 2018 $ 671,594 

Trade And Other Payables (Table

Trade And Other Payables (Tables)	12 Months Ended
	Dec. 31, 2018
Trade And Other Payables [Abstract]
Schedule Of Trade And Other Payables	   As at December 31, 2018 2017  Trade payables $ 93,482 $ 77,575  Accrued liabilities 63,666 55,332  Social security and sales taxes payable 19,390 14,693  Net consumption taxes payable 13,456 10,559  Share unit liabilities 3,714 5,407  Other payables 7,547 987  $ 201,255 $ 164,553 

Debt (Tables)

Debt (Tables)	12 Months Ended
	Dec. 31, 2018
Debt [Abstract]
Schedule of Debt	   Carrying amount  As at December 31, 2018 2017  Short-term debt $ 19,896 $ 7,018   Long-term debt:   Term loans (previously referred to as Delayed draw term loans):  Denominated in Canadian dollars, secured, bearing interest at a weighted  average rate of 4.339% , due in monthly installments of interest only and  quarterly installments of principal, maturing in October 2021 161,891 185,143  Denominated in United States dollars, secured, bearing interest at a weighted  average rate of 4.497% , due in weekly installments of interest only and  quarterly installments of principal, maturing in October 2021 62,690 144,544  Less: unamortized debt issue costs (2,419) (4,134)  Senior unsecured notes:  Bearing interest at 5.375% due in semi-annual installments, with the full  amount of principal due in January 2025 500,000 500,000  Less: unamortized debt issue costs (10,864) (12,661)  Total long-term debt 711,298 812,892   Total debt $ 731,194 $ 819,910   Long-term debt:  Current portion $ 13,126 $ 16,907  Non-current portion 698,172 795,985  Total long-term debt $ 711,298 $ 812,892 
Schedule Of Future Principal Loan Repayments	   Face value  2019 13,126  2020 17,502  2021 193,953  2022 -  2023 -  Thereafter 500,000  $ 724,581 

Other Non-current Liabilities (

Other Non-current Liabilities (Tables)	12 Months Ended
	Dec. 31, 2018
Other Non-current Liabilities [Abstract]
Other Non-current Liabilities	   As at December 31, 2018 2017  Tax payable $ 22,583 $ 25,958  Finance lease obligation 10,146 7,875  Share unit liabilities - 2,865  Other 9,251 10,075  $ 41,980 $ 46,773 

Equity and Dividends (Tables)

Equity and Dividends (Tables)	12 Months Ended
	Dec. 31, 2018
Equity and Dividends [Abstract]
Schedule of Quarterly Dividends Declared and Paid	   Declaration date Dividend per share Record date Total dividends Payment date  Year ended December 31, 2018:  Fourth quarter 2017 January 26, 2018 $ 0.1700 February 16, 2018 $ 18,246 March 9, 2018  First quarter 2018 May 9, 2018 0.1700 May 30, 2018 18,342 June 20, 2018  Second quarter 2018 August 7, 2018 0.1800 August 29, 2018 19,528 September 19, 2018  Third quarter 2018 November 8, 2018 0.1800 November 28, 2018 19,562 December 19, 2018   Year ended December 31, 2017:  Fourth quarter 2016 January 23, 2017 $ 0.1700 February 10, 2017 $ 18,160 March 3, 2017  First quarter 2017 May 4, 2017 0.1700 May 23, 2017 18,188 June 13, 2017  Second quarter 2017 August 4, 2017 0.1700 August 25, 2017 18,210 September 15, 2017  Third quarter 2017 November 8, 2017 0.1700 November 29, 2017 18,227 December 20, 2017   Year ended December 31, 2016:  Fourth quarter 2015 January 15, 2016 $ 0.1600 February 12, 2016 $ 17,154 March 4, 2016  First quarter 2016 May 9, 2016 0.1600 May 24, 2016 17,022 June 14, 2016  Second quarter 2016 August 5, 2016 0.1700 September 2, 2016 18,127 September 23, 2016  Third quarter 2016 November 8, 2016 0.1700 November 28, 2016 18,156 December 19, 2016   

Share-Based Payments (Tables)

Share-Based Payments (Tables)	12 Months Ended
	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation Costs Related to Share-Based Payments	   Year ended December 31, 2018 2017 2016  Stock option compensation expense:  SG&A expenses $ 7,895 $ 8,948 $ 5,507  Acquisition-related costs 357 4,752 -  Share unit expense:  Equity-classified share units 11,256 3,529 1,981  Liability-classified share units 1,764 670 10,512  Employee share purchase plan -  employer contributions 2,174 1,813 1,597  $ 23,446 $ 19,712 $ 19,597 
Summary of Stock Option Activity	   WA  Common WA remaining Aggregate  shares under exercise contractual intrinsic  option price life (in years) value  Outstanding, December 31, 2015 3,276,078 23.40  Granted 1,268,101 24.34  Exercised (1,081,531) 22.50 $ 9,380  Forfeited (95,934) 24.32  Outstanding, December 31, 2016 3,366,714 $ 24.02 7.5 $ 33,601  Granted 970,947 31.07  Assumed in acquisition 737,358 14.26  Exercised (444,571) 22.35 $ 3,762  Forfeited (170,704) 19.38  Outstanding, December 31, 2017 4,459,744 $ 24.29 7.5 $ 17,649  Granted 923,199 32.14  Exercised (1,235,154) 23.10 $ 14,808  Forfeited (132,624) 25.91  Expired (1,302) 25.76  Outstanding, December 31, 2018 4,013,863 $ 26.41 7.2 $ 25,374  Exercisable, December 31, 2018 2,074,873 $ 24.06 6.2 $ 17,963 
Summary of Share Unit Activity	    Equity-classified awards Liability-classified awards  PSUs RSUs PSUs RSUs DSUs  WA grant WA grant WA grant WA grant WA grant  date fair date fair date fair date fair date fair  Number value Number value Number value Number value Number value   Outstanding, December 31, 2015 - $ - - $ - 421,585 $ 24.03 332,954 $ 22.70 57,996 $ 24.21  Granted 7,714 31.40 - - 257,117 23.32 4,543 29.33 17,371 29.41  Transferred to (from) equity  awards on modification 257,934 27.34 - - (257,934) 23.86 - - - -  Vested and settled - - - - (68,683) 23.08 (162,306) 22.23 (1,847) 25.28  Forfeited (21,680) 27.43 - - (40,756) 22.75 (15,182) 22.68 - -   Outstanding, December 31, 2016 243,968 $ 27.48 - $ - 311,329 $ 23.96 160,009 $ 23.37 73,520 $ 25.41  Granted 136,073 30.28 125,152 26.93 98,775 31.21 878 32.30 19,967 29.67  Transferred to (from) equity  awards on modification 81,533 24.47 - - (81,533) 24.66 - - - -  Vested and settled (27,326) 26.82 - - (49,873) 23.64 (156,221) 23.33 - -  Forfeited - - - - (19,457) 26.39 - - - -  Outstanding, December 31, 2017 434,248 $ 27.83 125,152 $ 26.93 259,241 $ 26.38 4,666 $ 26.42 93,487 $ 26.32  Granted 240,803 35.63 91,251 32.10 - - 66 34.70 26,553 33.42  Transferred to equity  awards on modification 257,659 31.30 - - (257,659) 26.38 - - - -  Vested and settled (212,263) 33.78 - - - - (4,732) 26.54 (6,605) 23.16  Forfeited (50,159) 31.41 (8,417) 32.00 (1,582) 26.45 - - - -  Outstanding, December 31, 2018 670,288 $ 31.46 207,986 $ 28.99 - $ - - $ - 113,435 $ 28.16 (1) Liability-classified PSUs include PSUs awarded under the employee PSU plan and the previous 2013 PSU plan, in place prior to 2015, that are cash-settled and not subject to market vesting conditions.
Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Summary of Stock Option and Performance Share Unit Pricing Assumptions	   Year ended December 31, 2018 2017 2016  Risk free interest rate 2.7% 2.0% 1.2%  Expected dividend yield 2.11% 2.15% 2.66%  Expected lives of the stock options 5 years 5 years 5 years  Expected volatility 28.1% 27.8% 26.5% 
Sign-on Grant Performance Share Unit Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Summary of Stock Option and Performance Share Unit Pricing Assumptions	   September 11, 2018 2018  Risk free interest rate 2.7%  Expected dividend yield 1.53%  Expected lives of the PSU 1 year  Expected volatility 29.2% 
Stock Options Assumed [Member] | Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Summary of Stock Option and Performance Share Unit Pricing Assumptions	   Year ended December 31, 2017  Risk free interest rate 0.8%  Expected dividend yield 2.19%  Expected lives of the stock options 0.4 years  Expected volatility 32.1% 
Performance Share Units [Member] | Senior Executive and Employee Performance Share Unit Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Summary of Stock Option and Performance Share Unit Pricing Assumptions	   Year ended December 31, 2018 2017 2016  Risk free interest rate 1.92% 1.4% 1.2%  Expected dividend yield 2.09% 1.92% 2.50%  Expected lives of the PSUs 3 years 3 years 3 years  Expected volatility 31.1% 28.2% 29.9%  Average expected volatility of comparable companies 34.1% 37.0% 37.0% 
Performance Share Units, Equity Classified Awards [Member] | Senior Executive and Employee Performance Share Unit Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Summary of Stock Option and Performance Share Unit Pricing Assumptions	   Year ended December 31, 2017 2016  Risk free interest rate 1.5% 1.2%  Expected dividend yield 2.01% 2.40%  Expected lives of the PSUs 3 years 3 years  Expected volatility 28.9% 29.7%  Average expected volatility of comparable companies 33.4% 37.0% 

Commitments (Tables)

Commitments (Tables)	12 Months Ended
	Dec. 31, 2018
Commitments [Abstract]
Schedule of Future Minimum Rental Payments for Operating Leases	   2019 $ 15,988  2020 13,276  2021 10,554  2022 8,317  2023 6,560  Thereafter 42,333  $ 97,028 
Schedule Of Future Minimum Lease Payments For Capital Leases	   2019 $ 5,480  2020 4,564  2021 3,327  2022 2,023  2023 814  Thereafter -  $ 16,208 
Schedule Of Capital Leased Assets	   As at December 31, 2018 Cost Accumulated depreciation Net book value  Computer equipment $ 9,428 $ (3,992) $ 5,436  Yard and others 12,125 (2,585) 9,540  $ 21,553 $ (6,577) $ 14,976     As at December 31, 2017 Cost Accumulated depreciation Net book value  Computer equipment $ 8,699 $ (3,604) $ 5,095  Yard and auto equipment 6,493 (896) 5,597  $ 15,192 $ (4,500) $ 10,692 

Selected Quarterly Financial _2

Selected Quarterly Financial Data (Tables)	12 Months Ended
	Dec. 31, 2018
Selected Quarterly Financial Data [Abstract]
Schedule Of Quarterly Results	   Attributable to stockholders  Operating Net Net Earnings per share  2018 Revenues income income income Basic Diluted  First quarter $ 260,178 $ 32,873 $ 17,207 $ 17,138 $ 0.16 $ 0.16  Second quarter 308,530 64,795 45,727 45,717 0.42 0.42  Third quarter 245,346 31,194 23,112 23,138 0.21 0.21  Fourth quarter 355,972 56,327 35,460 35,486 0.33 0.32     Net Attributable to stockholders  Operating income Net income Earnings (loss) per share  2017 Revenues income (loss) (loss) Basic Diluted  First quarter $ 199,427 $ 23,597 $ 10,433 $ 10,377 $ 0.10 $ 0.10  Second quarter 252,613 26,888 17,713 17,635 0.16 0.16  Third quarter 227,401 16,931 10,323 10,261 0.10 0.09  Fourth quarter 291,750 40,038 36,837 36,754 0.34 0.34     Attributable to stockholders  Operating Net Net Earnings per share  2016 Revenues income income income Basic Diluted  First quarter $ 255,504 $ 39,174 $ 29,994 $ 29,406 $ 0.28 $ 0.27  Second quarter 275,667 53,635 40,591 39,710 0.37 0.37  Third quarter 300,976 2,285 (5,000) (5,137) (0.05) (0.05)  Fourth quarter 294,830 40,628 27,927 27,853 0.26 0.26 

Business Combinations (Tables)

Business Combinations (Tables)	12 Months Ended
	Dec. 31, 2018
Business Combinations [Abstract]
Schedule of Net Cash Flows and Purchase Price	   May 31, 2017  Cash consideration paid to former equity holders $ 723,810  Settlement of IronPlanet's debt 36,313  Settlement of IronPlanet's transaction costs 12,583  Cash consideration paid on closing 772,706  Cash consideration paid related to closing adjustments 1,771  Less: cash and cash equivalents acquired (95,626)  Less: restricted cash acquired (3,000)  Acquisition of IronPlanet, net of cash acquired $ 675,851   Cash consideration paid on closing $ 772,706  Replacement stock option awards attributable to pre-  combination services 4,926  Stock option compensation expense from accelerated vesting  of awards attributable to post-combination services (2,596)  Cash consideration paid relating to closing adjustments 1,771  Settlement of pre-existing intercompany balances (333)  Purchase price $ 776,474 
Schedule of Assets Acquired and Liabilities Assumed	   May 31, 2017  Purchase price $ 776,474   Assets acquired:  Cash and cash equivalents $ 95,626  Restricted cash 3,000  Trade and other receivables 13,021  Inventory 600  Advances against auction contracts 4,623  Prepaid expenses and deposits 1,645  Income taxes receivable 55  Property, plant and equipment 2,381  Other non-current assets 2,551  Deferred tax assets 1,497  Intangible assets ~ 188,000   Liabilities assumed:  Auction proceeds payable 63,616  Trade and other payables 15,540  Deferred tax liabilities 25,935  Fair value of identifiable net assets acquired 207,908  Goodwill acquired on acquisition $ 568,566 

Significant Accounting Polici_4

Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Intra-entity foreign currency transactions, long-term investments	$ 9,602	$ 18,129	$ 1,967
Liability Classified Awards [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Award vesting period	3 years

Significant Accounting Polici_5

Significant Accounting Policies (Depreciation of Assets Based on Usage) (Details)	12 Months Ended
	Dec. 31, 2018
Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Depreciation rate	10.00%
Buildings [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Fixed assets useful life	15 years
Buildings [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Fixed assets useful life	30 years
Yard Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciation rate	20.00%
Yard Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciation rate	30.00%
Automotive Equipment [Member]
Property, Plant and Equipment [Line Items]
Depreciation rate	30.00%
Computer Software and Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Fixed assets useful life	3 years
Computer Software and Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Fixed assets useful life	5 years
Office Equipment [Member]
Property, Plant and Equipment [Line Items]
Depreciation rate	20.00%

Significant Accounting Polici_6

Significant Accounting Policies (Amortization of Intangible Assets) (Details)	12 Months Ended
	Dec. 31, 2018
Minimum [Member] | Trade Names and Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	3 years
Minimum [Member] | Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	6 years
Minimum [Member] | Software Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	3 years
Maximum [Member] | Trade Names and Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	15 years
Maximum [Member] | Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	20 years
Maximum [Member] | Software Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	7 years

Significant Accounting Polici_7

Significant Accounting Policies (Schedule of Adoption of New Accounting Pronouncements) (Details) - USD ($)	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, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total revenues	$ 355,972,000	$ 245,346,000	$ 308,530,000	$ 260,178,000	$ 291,750,000	$ 227,401,000	$ 252,613,000	$ 199,427,000	$ 294,830,000	$ 300,976,000	$ 275,667,000	$ 255,504,000	$ 1,170,026,000	$ 971,191,000	$ 1,126,977,000
Gross revenue, net of expenses															188,561,000
Financing cash flows													(134,107,000)	119,263,000	404,143,000
ASU 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total revenues														971,191,000	1,126,977,000
Gross revenue, net of expenses														531,504,000	500,333,000
ASU 2014-09 [Member] | Scenario, Previously Reported [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total revenues														610,517,000	566,395,000
Direct expenses														(79,013,000)	(66,062,000)
Gross revenue, net of expenses														531,504,000	500,333,000
ASU 2014-09 [Member] | Scenario, Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total revenues														360,674,000	560,582,000
ASU 2016-15 [Member] | Scenario, Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing cash flows													1,302,000
Service Revenues [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total revenues													749,515,000	624,417,000	555,843,000
Direct expenses													(159,058,000)	(133,189,000)	(113,296,000)
Service Revenues [Member] | ASU 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total revenues														624,417,000	555,843,000
Direct expenses														(133,189,000)	(113,296,000)
Service Revenues [Member] | ASU 2014-09 [Member] | Scenario, Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total revenues														13,900,000	(10,552,000)
Direct expenses														(54,176,000)	(47,234,000)
Revenue from Inventory Sales [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total revenues													420,511,000	346,774,000	571,134,000
Direct expenses													$ (374,339,000)	(306,498,000)	(513,348,000)
Revenue from Inventory Sales [Member] | ASU 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total revenues														346,774,000	571,134,000
Direct expenses														(306,498,000)	(513,348,000)
Revenue from Inventory Sales [Member] | ASU 2014-09 [Member] | Scenario, Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total revenues														346,774,000	571,134,000
Direct expenses														$ (306,498,000)	$ (513,348,000)

Segmented Information (Narrativ

Segmented Information (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)segment	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment	1
Goodwill	$ 671,594	$ 670,922	$ 97,537
Auctions and Marketplaces [Member]
Segment Reporting Information [Line Items]
Goodwill	651,359	649,770
Other Reporting Unit [Member]
Segment Reporting Information [Line Items]
Goodwill	$ 20,235	$ 21,152

Segmented Information (Schedule

Segmented Information (Schedule of Revenue and (Loss) Income Before Taxes by Segment) (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, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting [Line Items]
Revenues	$ 355,972	$ 245,346	$ 308,530	$ 260,178	$ 291,750	$ 227,401	$ 252,613	$ 199,427	$ 294,830	$ 300,976	$ 275,667	$ 255,504	$ 1,170,026	$ 971,191	$ 1,126,977
SG&A expenses													382,676	323,270	283,529
Impairment loss														8,911	28,243
Gross revenue, net of expenses															188,561
Acquisition-related costs													5,093	38,272	11,829
Depreciation and amortization expenses ("D&A")													66,614	52,694	40,861
Gain on disposition of property, plant and equipment ("PPE")													(2,731)	(1,656)	(1,282)
Unrealized foreign exchange loss													(212)	2,559	1,431
Operating income	56,327	31,194	64,795	32,873	40,038	16,931	26,888	23,597	40,628	2,285	53,635	39,174	185,189	107,454	135,722
Interest expense													(44,527)	(38,291)	(5,564)
Debt extinguishment costs															(6,787)
Other income, net													11,850	8,231	7,123
Income tax expense													(31,006)	(2,088)	(36,982)
Net income	$ 35,460	$ 23,112	$ 45,727	$ 17,207	$ 36,837	$ 10,323	$ 17,713	$ 10,433	$ 27,927	$ (5,000)	$ 40,591	$ 29,994	121,506	75,306	93,512
Operating Segments [Member]
Segment Reporting [Line Items]
Revenues													1,170,026	971,191	1,126,977
SG&A expenses													382,676	323,270
Impairment loss														8,911
Gross revenue, net of expenses													253,953	199,323
Acquisition-related costs														38,272
Depreciation and amortization expenses ("D&A")													66,614	52,694
Gain on disposition of property, plant and equipment ("PPE")														(1,656)
Unrealized foreign exchange loss														(2,559)
Operating income													185,189	107,454
Interest expense													(44,527)	(38,291)
Other income, net													11,850	8,231
Income tax expense													(31,006)	(2,088)
Net income													121,506	75,306
Segment Reconciling Items [Member]
Segment Reporting [Line Items]
Acquisition-related costs													5,093		11,829
Depreciation and amortization expenses ("D&A")															40,861
Gain on disposition of property, plant and equipment ("PPE")													(2,731)		(1,282)
Unrealized foreign exchange loss													(212)		(1,431)
Auctions and Marketplaces [Member] | Operating Segments [Member]
Segment Reporting [Line Items]
Revenues													1,046,518	870,797	1,045,174
SG&A expenses													363,549	308,873	272,317
Impairment loss														8,911	28,243
Gross revenue, net of expenses													221,200	170,830	166,018
Other Reporting Unit [Member] | Operating Segments [Member]
Segment Reporting [Line Items]
Revenues													123,508	100,394	81,803
SG&A expenses													19,127	14,397	11,212
Gross revenue, net of expenses													32,753	28,493	22,543
Service Revenues [Member]
Segment Reporting [Line Items]
Revenues													749,515	624,417	555,843
Direct expenses													159,058	133,189	113,296
Service Revenues [Member] | Operating Segments [Member]
Segment Reporting [Line Items]
Revenues													749,515	624,417	555,843
Direct expenses													159,058	133,189
Service Revenues [Member] | Auctions and Marketplaces [Member] | Operating Segments [Member]
Segment Reporting [Line Items]
Revenues													626,007	524,023	474,040
Direct expenses													87,430	75,685	65,248
Service Revenues [Member] | Other Reporting Unit [Member] | Operating Segments [Member]
Segment Reporting [Line Items]
Revenues													123,508	100,394	81,803
Direct expenses													71,628	57,504	48,048
Revenue from Inventory Sales [Member]
Segment Reporting [Line Items]
Revenues													420,511	346,774	571,134
Direct expenses													374,339	306,498	513,348
Revenue from Inventory Sales [Member] | Operating Segments [Member]
Segment Reporting [Line Items]
Revenues													420,511	346,774	571,134
Direct expenses													374,339	306,498
Revenue from Inventory Sales [Member] | Auctions and Marketplaces [Member] | Operating Segments [Member]
Segment Reporting [Line Items]
Revenues													420,511	346,774	571,134
Direct expenses													$ 374,339	$ 306,498	$ 513,348

Segmented information (Schedu_2

Segmented information (Schedule of Carrying Value Goodwill) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Goodwill	$ 671,594	$ 670,922	$ 97,537
Auctions and Marketplaces [Member]
Goodwill	651,359	649,770
Other Reporting Unit [Member]
Goodwill	$ 20,235	$ 21,152

Segmented Information (Geograph

Segmented Information (Geographic Information of Revenue) (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, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 355,972	$ 245,346	$ 308,530	$ 260,178	$ 291,750	$ 227,401	$ 252,613	$ 199,427	$ 294,830	$ 300,976	$ 275,667	$ 255,504	$ 1,170,026	$ 971,191	$ 1,126,977
Operating Segments [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues													1,170,026	971,191	1,126,977
United States [Member] | Operating Segments [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues													548,695	452,599	555,837
Canada [Member] | Operating Segments [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues													284,989	245,106	293,956
Europe [Member] | Operating Segments [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues													180,817	127,706	109,024
Other [Member] | Operating Segments [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues													$ 155,525	$ 145,780	$ 168,160

Segmented Information (Geogra_2

Segmented Information (Geographic Information of Long-lived Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment	$ 486,599	$ 526,581
Operating Segments [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment	486,599	526,581
United States [Member] | Operating Segments [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment	260,489	275,628
Canada [Member] | Operating Segments [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment	100,983	116,833
Europe [Member] | Operating Segments [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment	77,496	82,795
Other [Member] | Operating Segments [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment	$ 47,631	$ 51,325

Revenues (Details)

Revenues (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, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues	$ 355,972	$ 245,346	$ 308,530	$ 260,178	$ 291,750	$ 227,401	$ 252,613	$ 199,427	$ 294,830	$ 300,976	$ 275,667	$ 255,504	$ 1,170,026	$ 971,191	$ 1,126,977
Service Revenues [Member]
Revenues													749,515	624,417	555,843
Commission Revenue [Member]
Revenues													420,160	394,397	366,342
Fees Revenue [Member]
Revenues													329,355	230,020	189,501
Revenue from Inventory Sales [Member]
Revenues													$ 420,511	$ 346,774	$ 571,134

Operating Expenses (Narrative)

Operating Expenses (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Amortization expense	$ 37,593	$ 24,357	$ 9,878
Depreciation expense	29,021	28,337	30,983
Software [Member]
Property, Plant and Equipment [Line Items]
Amortization expense	18,996	11,662	7,218
Depreciation expense	$ 494	$ 1,207	$ 2,880

Operating Expenses (Schedule of

Operating Expenses (Schedule of Direct Operating Expenses) (Details) - Service Revenues [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Ancillary and logistical service expenses	$ 66,576	$ 54,176	$ 47,234
Employee compensation expenses	41,391	35,440	27,856
Buildings, facilities and technology expenses	9,477	8,359	7,966
Travel, advertising and promotion expenses	27,606	23,994	23,688
Other costs of services	14,008	11,220	6,552
Total direct expenses	$ 159,058	$ 133,189	$ 113,296

Operating Expenses (Schedule _2

Operating Expenses (Schedule of Selling, General and Administrative Expenses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating Expenses [Abstract]
Employee compensation expenses	$ 249,115	$ 208,370	$ 180,929
Buildings, facilities and technology expenses	60,930	53,151	49,219
Travel, advertising and promotion expenses	36,728	30,440	24,384
Professional fees	16,768	13,522	13,344
Other SG&A expenses	19,135	17,787	15,653
Total selling, general and administrative expenses	$ 382,676	$ 323,270	$ 283,529

Operating Expenses (Schedule _3

Operating Expenses (Schedule of Acquisition Related Costs) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Iron Planet Holdings Inc. [Member] | Other Related Costs [Member]
Acquisition-related costs	$ 2,944	$ 34,653	$ 8,202
Other Acquisitions [Member]
Acquisition-related costs	5,093	38,272	11,829
Other Acquisitions [Member] | Employment Costs [Member]
Acquisition-related costs	2,091	3,418	2,491
Other Acquisitions [Member] | Other Related Costs [Member]
Acquisition-related costs	$ 58	$ 201	$ 1,136

Operating Expenses (Schedule _4

Operating Expenses (Schedule of Depreciation and Amortization Expenses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating Expenses [Abstract]
Depreciation expense	$ 29,021	$ 28,337	$ 30,983
Amortization expense	37,593	24,357	9,878
Total depreciation and amortization expenses	$ 66,614	$ 52,694	$ 40,861

Impairment Loss (Details)

Impairment Loss (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Goodwill impairment	$ 0	$ 0
Impairment loss		8,911,000	$ 28,243,000
Deferred tax benefit	$ (6,239,000)	17,268,000	3,359,000
EquipmentOne [Member]
Property, Plant and Equipment [Line Items]
Goodwill impairment			23,574,000
Deferred tax benefit		1,798,000
Technology [Member]
Property, Plant and Equipment [Line Items]
Impairment loss		8,911,000
Customer Relationships [Member] | EquipmentOne [Member]
Property, Plant and Equipment [Line Items]
Impairment loss		$ 8,911,000	$ 4,669,000

Other Income (Details)

Other Income (Details)	12 Months Ended
	Dec. 31, 2018USD ($)
Other Income [Abstract]
Gain on equity accounted for investments	$ 4,935,000
Proceeds on disposal of equity investment	6,147,000
Additional proceeds after escrow conditions	$ 1,020,000
Escrow release conditions period	5 years
Contingent consideration on sale of equity	$ 1,700,000

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Line Items]
Capital loss carry-forwards	$ 22,111	$ 4,602	$ 22,111	$ 4,602
Foreign provision for income taxes			102,824	64,252	$ 25,139
Undistributed earnings	484,510		484,510
Unrecognized deferred tax liability related to temporary differences	8,799		8,799
Earnings retained by subsidiaries and equity accounted investments			484,510	469,000	450,000
Gross unrecognized tax benefits	22,584	25,910	22,584	25,910	$ 19,262
Unrecognized tax benefits that would impact effective tax rate	10,556	13,737	10,556	13,737
Accrued interest and penalties	4,170	3,677	4,170	3,677
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Provisional Income Tax Expense (Benefit)	203	9,734
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Change in Tax Rate, Deferred Tax Asset, Provisional Income Tax Expense (Benefit)	10,017	10,070
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Transition Tax for Accumulated Foreign Earnings, Provisional Liability	486	336	486	336
Capital Loss Carryforward [Member]
Income Tax Disclosure [Line Items]
Capital loss carry-forwards	$ 9,292	$ 11,343	$ 9,292	$ 11,343

Income Taxes (Schedule of Effec

Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Taxes [Abstract]
Income before income taxes	$ 152,512	$ 77,394	$ 130,494
Statutory federal and provincial tax rate in Canada	27.00%	26.00%	26.00%
Expected income tax expense	$ 41,178	$ 20,122	$ 33,928
Non-deductible expenses	4,810	5,668	3,891
Adjustments to prior years provision to statutory tax returns	1,323	(528)	(824)
Changes in the valuation of deferred tax assets	(771)	(1,089)	(259)
Different tax rates of subsidiaries operating in foreign jurisdictions	(17,145)	(12,269)	(3,786)
U.S. tax reform impacts	4,899	(9,734)
Impairment of Goodwill			6,129
Change in estimate of deductibility of stock options		(1,557)
Unrecognized tax benefits	(1,800)	3,291	799
Benefits of deductible stock options vested and exercised	(2,434)	(1,359)	(1,042)
Deductions for tax purposes in excess of accounting expenses	(383)	(380)	(490)
Other	1,329	(77)	(1,364)
Income tax expense	$ 31,006	$ 2,088	$ 36,982

Income Taxes (Summary of Income

Income Taxes (Summary of Income Tax Expense (Recovery)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Taxes [Abstract]
Canadian, Current tax expense	$ 13,209	$ 14,245	$ 30,525
Canadian, Deferred tax expense (recovery)	3,958	(10,192)	(2,068)
Current tax expense before application of operating loss carryforwards	19,851	8,987	12,126
Tax benefit of operating loss carryforwards	(8,293)	(3,876)	(2,310)
Total foreign current tax expense	11,558	5,111	9,816
Deferred tax expense before adjustment to opening valuation allowance	2,386	(6,317)	(1,291)
Adjustment to opening valuation allowance	(105)	(759)
Total foreign deferred tax expense	2,281	(7,076)	(1,291)
Income tax expense	$ 31,006	$ 2,088	$ 36,982

Income Taxes (Schedule of Defer

Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Income Taxes [Abstract]
Working capital	$ 4,703	$ 9,583
Property, plant and equipment	6,385	6,495
Goodwill		1,016
Share-based compensation	4,923	5,733
Tax losses and tax credit carryforwards	48,881	52,251
Other	14,844	7,635
Deferred tax assets	79,736	82,713
Property, plant and equipment	(10,918)	(9,779)
Goodwill	(8,390)	(9,202)
Intangible assets	(54,810)	(54,401)
Other	(12,051)	(8,628)
Deferred tax liabilities	(86,169)	(82,010)
Net deferred tax assets (liabilities)	(6,433)	703
Valuation allowance	(13,438)	(14,363)
Total Deferred Tax Assets (Liabilities)	$ (19,871)	$ (13,660)

Income Taxes (Schedule of Non-c

Income Taxes (Schedule of Non-capital Loss Carryforwards) (Details) $ in Thousands	Dec. 31, 2018USD ($)
Income Taxes [Abstract]
2,019	$ 106
2,020	4,232
2,021	5,017
2,022	3,543
2023 and thereafter	154,593
Non-capital loss carry forwards	$ 167,491

Income Taxes (Schedule of Unrec

Income Taxes (Schedule of Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits, beginning of year	$ 25,910	$ 19,262
Increases - tax positions taken in prior period	725	4,426
Decreases - tax positions taken in prior period	(107)	(124)
Increases - tax positions taken in current period	2,644	2,346
Settlement and lapse of statute of limitations	(4,944)
Currency translation adjustment	(1,644)
Unrecognized tax benefits, end of year	$ 22,584	$ 25,910

Contingently Redeemable Non-c_2

Contingently Redeemable Non-controlling Interest in Ritchie Bros. Financial Services (Details) $ in Thousands, $ in Thousands	Jul. 12, 2016CAD ($)	Jul. 12, 2016USD ($)	Dec. 31, 2018	Dec. 31, 2016USD ($)	Jul. 12, 2016USD ($)
Redeemable Noncontrolling Interest [Line Items]
Cash consideration				$ 41,092
RBFS [Member] | Ritchie Bros. Financial Services [Member]
Redeemable Noncontrolling Interest [Line Items]
Percentage of ownership interest, majority	51.00%	51.00%
NCI Holders [Member] | Ritchie Bros. Financial Services [Member]
Redeemable Noncontrolling Interest [Line Items]
Percentage of ownership interest	49.00%				49.00%
Total consideration	$ 57,900	$ 44,141
Cash consideration	53,900	$ 41,092
Contingent consideration	4,000				$ 3,049
Additional cash compensation	1,500
Period to make additional amount of obligation upon achievement of certain condition			3 years
NCI Holders [Member] | Maximum [Member] | Ritchie Bros. Financial Services [Member]
Redeemable Noncontrolling Interest [Line Items]
Additional cash compensation	$ 10,000

Earnings Per Share Attributab_3

Earnings Per Share Attributable to Stockholders (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, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Earnings Per Share Attributable to Stockholders [Abstract]
Basic, Net income attributable to stockholders													$ 121,479	$ 75,027	$ 91,832
Effect of dilutive securities: Share units, Net income attributable to stockholders														(152)
Diluted, Net income attributable to stockholders													$ 121,479	$ 74,875	$ 91,832
Basic, WA number of shares													108,063,349	107,044,348	106,630,323
Effect of dilutive securities: Share units, WA number of shares													459,503	353,880	91,997
Effect of dilutive securities: Stock options, WA number of shares													865,384	714,923	735,474
Diluted, WA number of shares													109,388,236	108,113,151	107,457,794
Basic, Per share amount	$ 0.33	$ 0.21	$ 0.42	$ 0.16	$ 0.34	$ 0.10	$ 0.16	$ 0.10	$ 0.26	$ (0.05)	$ 0.37	$ 0.28	$ 1.12	$ 0.70	$ 0.86
Effect of dilutive securities: Stock options, Per share amount													(0.01)	(0.01)	(0.01)
Diluted, Per share amount	$ 0.32	$ 0.21	$ 0.42	$ 0.16	$ 0.34	$ 0.09	$ 0.16	$ 0.10	$ 0.26	$ (0.05)	$ 0.37	$ 0.27	$ 1.11	$ 0.69	$ 0.85

Supplemental Cash Flow Inform_3

Supplemental Cash Flow Information (Narrative) (Details) - USD ($)	Dec. 21, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net capital spending		$ 32,426,000	$ 34,436,000	$ 29,785,000
5.375% Senior Unsecured Note, Due January 2025 [Member]
Principal amount	$ 500,000,000	$ 500,000,000
Interest rate	5.375%	5.375%
Maturity date	Jan. 15, 2025	Jan. 15, 2025

Supplemental Cash Flow Inform_4

Supplemental Cash Flow Information (Schedule of Net Changes In Operating Assets and Liabilities) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Supplemental Cash Flow Information [Abstract]
Trade and other receivables	$ (43,341)	$ (19,161)	$ 6,419
Inventory	(77,292)	(8,557)	26,557
Advances against auction contracts	(8,266)	3,246	(1,012)
Prepaid expenses and deposits	646	1,178	(7,443)
Income taxes receivable	13,053	(6,067)	(10,686)
Auction proceeds payable	8,768	25,783	550
Trade and other payables	39,531	21,854	5,627
Income taxes payable	1,954	(3,986)	(8,657)
Share unit liabilities	1,070	(5,421)	4,503
Other	(1,673)	1,410	(5,176)
Net changes in operating assets and liabilities	$ (65,550)	$ 10,279	$ 10,682

Supplemental Cash Flow Inform_5

Supplemental Cash Flow Information (Schedule of Supplemental Cash Flow) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Supplemental Cash Flow Information [Abstract]
Interest paid, net of interest capitalized	$ 39,429	$ 23,360	$ 5,792
Interest received	2,888	3,196	1,861
Net income taxes paid	10,352	28,281	54,037
Non-cash purchase of property, plant and equipment under capital lease	$ 8,968	$ 8,820	$ 3,376

Supplemental Cash Flow Inform_6

Supplemental Cash Flow Information (Schedule of Cash, Cash Equivalents and Restricted Cash) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Supplemental Cash Flow Information [Abstract]
Cash and cash equivalents	$ 237,744	$ 267,910	$ 207,867
Restricted cash	67,823	63,206	550,222
Cash, cash equivalents, and restricted cash	$ 305,567	$ 331,116	$ 758,089	$ 293,246

Fair Value Measurement (Details

Fair Value Measurement (Details) - Recurring [Member] - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Carrying Amount [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	$ 237,744	$ 267,910
Restricted Cash	67,823	63,206
Fair Value [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	237,744	267,910
Restricted Cash	67,823	63,206
Short-term Debt [Member] | Carrying Amount [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument	19,896	7,018
Short-term Debt [Member] | Fair Value [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument	19,896	7,018
Senior Unsecured Notes [Member] | Long-term Debt [Member] | Carrying Amount [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument	489,136	487,339
Senior Unsecured Notes [Member] | Long-term Debt [Member] | Fair Value [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument	487,813	520,000
Delayed Draw Term Loans [Member] | Long-term Debt [Member] | Carrying Amount [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument	222,162	325,553
Delayed Draw Term Loans [Member] | Long-term Debt [Member] | Fair Value [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument	$ 224,582	$ 329,687

Trade and Other Receivables (Na

Trade and Other Receivables (Narrative) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Trade and Other Receivables [Abstract]
Impaired receivables where recovering the debt is considered unlikely	$ 5,942	$ 5,443

Trade and Other Receivables (Sc

Trade and Other Receivables (Schedule of Trade and Other Receivables) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Trade and other receivables	$ 129,257	$ 92,105
Trade Receivables [Member]
Trade and other receivables	112,680	77,870
Consumption Taxes Receivable [Member]
Trade and other receivables	16,099	13,592
Other Receivables [Member]
Trade and other receivables	$ 478	$ 643

Inventory (Details)

Inventory (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017	Dec. 31, 2016
Inventory [Abstract]
Inventory write down	$ 1,011	$ 834	$ 3,084

Other Current Assets (Narrative

Other Current Assets (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds on disposition of assets	$ 10,586	$ 4,985	$ 6,691
Period to settle advances against auction contracts	14 days
Prince George, Canada and Albuquerque, United States [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds on disposition of assets	$ 7,071
Gain on sale of assets	$ 1,439
Orlando, United States, and Truro, Canada [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale of assets		$ 602
Denver, United States [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale of assets			$ 493

Other Current Assets (Schedule

Other Current Assets (Schedule of Other Current Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other Current Assets [Abstract]
Advances against auction contracts	$ 15,558	$ 7,336
Assets held for sale	15,051	584	$ 632
Prepaid expenses and deposits	18,446	19,690
Other Current Assets	$ 49,055	$ 27,610

Other Current Assets (Summary o

Other Current Assets (Summary of Assets Held For Sale) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Other Current Assets [Abstract]
Beginning balance	$ 584	$ 632
Site preparation costs		25
Reclassified from property, plant and equipment	20,610	411
Disposal	(6,143)	(484)
Ending balance	$ 15,051	$ 584

Property, Plant And Equipment_2

Property, Plant And Equipment (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Abstract]
Interest capitalized	$ 110	$ 110	$ 95
Interest cost rate	4.06%	2.97%	3.99%
Additions of property, plant and equipment	$ 8,968	$ 8,820	$ 3,376

Property, Plant And Equipment_3

Property, Plant And Equipment (Schedule of Property, Plant and Equipment) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Cost	$ 798,825	$ 831,243
Accumulated depreciation	(312,226)	(304,662)
Net book value	486,599	526,581
Land and Improvements [Member]
Property, Plant and Equipment [Line Items]
Cost	362,781	379,546
Accumulated depreciation	(72,547)	(68,706)
Net book value	290,234	310,840
Buildings [Member]
Property, Plant and Equipment [Line Items]
Cost	252,182	267,334
Accumulated depreciation	(106,959)	(103,544)
Net book value	145,223	163,790
Yard and Automotive Equipment [Member]
Property, Plant and Equipment [Line Items]
Cost	57,983	58,209
Accumulated depreciation	(36,640)	(38,126)
Net book value	21,343	20,083
Computer Software and Equipment [Member]
Property, Plant and Equipment [Line Items]
Cost	70,623	69,718
Accumulated depreciation	(60,258)	(60,451)
Net book value	10,365	9,267
Office Equipment [Member]
Property, Plant and Equipment [Line Items]
Cost	28,490	25,430
Accumulated depreciation	(19,582)	(18,745)
Net book value	8,908	6,685
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Cost	19,735	21,467
Accumulated depreciation	(16,240)	(15,090)
Net book value	3,495	6,377
Assets under Development [Member]
Property, Plant and Equipment [Line Items]
Cost	7,031	9,539
Net book value	$ 7,031	$ 9,539

Other Non-current Assets (Narra

Other Non-current Assets (Narrative) (Details)	Dec. 31, 2018
Cura Classis Entities [Member]
Percentage of ownership interest	48.00%

Other Non-current Assets (Sched

Other Non-current Assets (Schedule of Other Non-current Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Other Non-current Assets [Abstract]
Tax receivable	$ 12,705	$ 12,851
Deferred debt issue costs	2,017	3,768
Equity-accounted investments	4,010	7,408
Other	10,663	7,527
Other Non-current Assets, Total	$ 29,395	$ 31,554

Other Non-current Assets (Summa

Other Non-current Assets (Summary of Investments) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]
Equity-accounted investments	$ 4,010	$ 7,408
Cura Classis Entities [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage	48.00%
Equity-accounted investments	$ 4,010	4,720
Other Equity Investments [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage	32.00%
Equity-accounted investments		$ 2,688

Intangible Assets (Narrative) (

Intangible Assets (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Intangible assets not subject to amortization	$ 61,883,000	$ 59,380,000
Cost of additions reduced by recognition of tax credits	1,606,000	888,000	$ 1,094,000
Impairment loss		8,911,000	28,243,000
Capitalized cost of software under development	$ 460,000	$ 281,000	$ 356,000
Interest costs, weighted average rate	4.09%	3.18%	4.91%
Weighted average amortization period	8 years 2 months 12 days	7 years 10 months 24 days	8 years 2 months 12 days
Customer Relationships [Member] | EquipmentOne [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment loss		$ 8,911,000	$ 4,669,000

Intangible Assets (Schedule Of

Intangible Assets (Schedule Of Indefinite-Lived And Definite-Lived Intangible Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Indefinite-Lived and Finite-Lived Intangible Assets By Major Class [Line Items]
Cost	$ 317,355	$ 297,940
Accumulated amortization	(71,733)	(36,846)
Net book value	245,622	261,094
Trade Names and Trademarks [Member]
Indefinite-Lived and Finite-Lived Intangible Assets By Major Class [Line Items]
Cost	53,409	53,566
Accumulated amortization	(1,201)	(461)
Net book value	52,208	53,105
Customer Relationships [Member]
Indefinite-Lived and Finite-Lived Intangible Assets By Major Class [Line Items]
Cost	124,986	125,234
Accumulated amortization	(22,010)	(9,487)
Net book value	102,976	115,747
Software Assets [Member]
Indefinite-Lived and Finite-Lived Intangible Assets By Major Class [Line Items]
Cost	127,320	110,201
Accumulated amortization	(48,522)	(26,898)
Net book value	78,798	83,303
Software Under Development [Member]
Indefinite-Lived and Finite-Lived Intangible Assets By Major Class [Line Items]
Cost	11,640	8,939
Net book value	$ 11,640	$ 8,939

Intangible Assets (Schedule o_2

Intangible Assets (Schedule of Annual Amortization Expense) (Details) $ in Thousands	Dec. 31, 2018USD ($)
Goodwill and Intangible Assests [Abstract]
2,019	$ 35,651
2,020	28,801
2,021	23,303
2,022	20,727
2,023	16,567
Total	$ 125,049

Goodwill (Details)

Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Goodwill and Intangible Assests [Abstract]
Goodwill, Balance	$ 670,922	$ 97,537
Additions	3,671	568,936
Foreign exchange movement	(2,999)	4,449
Goodwill, Balance	$ 671,594	$ 670,922

Trade And Other Payables (Detai

Trade And Other Payables (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Trade And Other Payables [Abstract]
Trade payables	$ 93,482	$ 77,575
Accrued liabilities	63,666	55,332
Social security and sales taxes payable	19,390	14,693
Net consumption taxes payable	13,456	10,559
Share unit liabilities	3,714	5,407
Other payables	7,547	987
Accounts Payable and Accrued Liabilities, Current, Total	$ 201,255	$ 164,553

Debt (Narrative) (Details)

Debt (Narrative) (Details) - USD ($)	May 31, 2017	Dec. 21, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jun. 21, 2018	Oct. 27, 2016
Debt [Line Items]
Repayment of debt			$ 91,013,000	$ 108,985,000	$ 148,158,000
Increment amount							$ 50,000,000
Committed Revolving Credit Facilities [Member]
Debt [Line Items]
Maximum borrowing capacity			467,801,000
Available borrowing capacity			463,673,000
5.375% Senior Unsecured Note, Due January 2025 [Member]
Debt [Line Items]
Principal amount		$ 500,000,000	$ 500,000,000
Interest rate		5.375%	5.375%
Maturity date		Jan. 15, 2025	Jan. 15, 2025
Revolving Credit Facility [Member]
Debt [Line Items]
Principal amount	$ 325,000,000					$ 185,000,000
Maximum borrowing capacity			$ 490,000,000
Increment amount			$ 50,000,000
Amortization, first period	5.00%
Amortization, second period	10.00%
Weighted average interest rate			2.30%	2.70%
Multicurrency Facilities [Member]
Debt [Line Items]
Principal amount							675,000,000
Term Loan Facility [Member]
Debt [Line Items]
Principal amount							$ 325,000,000
Repayment of debt			$ 11,013,000	$ 8,410,000
Prepayment of debt			$ 80,000,000

Debt (Summary of Debt) (Details

Debt (Summary of Debt) (Details) - USD ($) $ in Thousands	Dec. 21, 2016	Dec. 31, 2018	Dec. 31, 2017
Debt [Line Items]
Short-term debt		$ 19,896	$ 7,018
Long-term Debt, Total		711,298	812,892
Total debt		731,194	819,910
Current portion		13,126	16,907
Non-current portion		698,172	795,985
Delayed Draw Term Loans [Member]
Debt [Line Items]
Less: unamortized debt issue costs		(2,419)	(4,134)
Senior Unsecured Notes [Member]
Debt [Line Items]
Less: unamortized debt issue costs		(10,864)	(12,661)
Delayed Draw Term Loan, In Canadian Dollars, Available until October 2021 [Member] | Delayed Draw Term Loans [Member]
Debt [Line Items]
Long-term Debt		$ 161,891	185,143
Weighted average interest rate		4.339%
Maturity date		Oct. 1, 2021
Delayed Draw Term Loan, In US Dollars, Available until October 2021 [Member] | Delayed Draw Term Loans [Member]
Debt [Line Items]
Long-term Debt		$ 62,690	144,544
Weighted average interest rate		4.497%
Maturity date		Oct. 1, 2021
5.375% Senior Unsecured Note, Due January 2025 [Member]
Debt [Line Items]
Interest rate	5.375%	5.375%
Maturity date	Jan. 15, 2025	Jan. 15, 2025
5.375% Senior Unsecured Note, Due January 2025 [Member] | Senior Unsecured Notes [Member]
Debt [Line Items]
Long-term Debt		$ 500,000	$ 500,000
Interest rate		5.375%
Maturity date		Jan. 1, 2025

Debt (Schedule of Future Princi

Debt (Schedule of Future Principal Loan Repayments) (Details) $ in Thousands	Dec. 31, 2018USD ($)
Debt [Abstract]
2,019	$ 13,126
2,020	17,502
2,021	193,953
2,022
2,023
Thereafter	500,000
Total debt	$ 724,581

Other Non-current Liabilities_2

Other Non-current Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Other Non-current Liabilities [Abstract]
Tax payable	$ 22,583	$ 25,958
Finance lease obligation	10,146	7,875
Share unit liabilities		2,865
Other	9,251	10,075
Other non-current liabilities, Total	$ 41,980	$ 46,773

Equity and Dividends (Narrative

Equity and Dividends (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	2 Months Ended	12 Months Ended
	Feb. 26, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2018
Equity and Dividends [Abstract]
Preferred shares issued				0
Stock repurchased during period, shares		0	1,460,000
Stock repurchased during period, per share			$ 25.16
Dividends declared (usd per share)	$ 0.18
Dividends, common stock	$ 19,569
Payment date	Mar. 9, 2019
Record date	Feb. 15, 2019

Equity and Dividends (Schedule

Equity and Dividends (Schedule of Quarterly Dividends Declared and Paid) (Details) - USD ($) $ / shares in Units, $ in Thousands	2 Months Ended	12 Months Ended
	Feb. 26, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Dividends Payable [Line Items]
Dividend per share	$ 0.18
Record date	Feb. 15, 2019
Payment date	Mar. 9, 2019
Fourth Quarter 2015 [Member]
Dividends Payable [Line Items]
Declaration date				Jan. 15, 2016
Dividend per share				$ 0.1600
Record date				Feb. 12, 2016
Total dividends				$ 17,154
Payment date				Mar. 4, 2016
First Quarter 2016 [Member]
Dividends Payable [Line Items]
Declaration date				May 9, 2016
Dividend per share				$ 0.1600
Record date				May 24, 2016
Total dividends				$ 17,022
Payment date				Jun. 14, 2016
Second Quarter 2016 [Member]
Dividends Payable [Line Items]
Declaration date				Aug. 5, 2016
Dividend per share				$ 0.1700
Record date				Sep. 2, 2016
Total dividends				$ 18,127
Payment date				Sep. 23, 2016
Third Quarter 2016 [Member]
Dividends Payable [Line Items]
Declaration date				Nov. 8, 2016
Dividend per share				$ 0.1700
Record date				Nov. 28, 2016
Total dividends				$ 18,156
Payment date				Dec. 19, 2016
Fourth Quarter 2016 [Member]
Dividends Payable [Line Items]
Declaration date			Jan. 23, 2017
Dividend per share			$ 0.1700
Record date			Feb. 10, 2017
Total dividends			$ 18,160
Payment date			Mar. 3, 2017
First Quarter 2017 [Member]
Dividends Payable [Line Items]
Declaration date			May 4, 2017
Dividend per share			$ 0.1700
Record date			May 23, 2017
Total dividends			$ 18,188
Payment date			Jun. 13, 2017
Second Quarter 2017 [Member]
Dividends Payable [Line Items]
Declaration date			Aug. 4, 2017
Dividend per share			$ 0.1700
Record date			Aug. 25, 2017
Total dividends			$ 18,210
Payment date			Sep. 15, 2017
Third Quarter 2017 [Member]
Dividends Payable [Line Items]
Declaration date			Nov. 8, 2017
Dividend per share			$ 0.1700
Record date			Nov. 29, 2017
Total dividends			$ 18,227
Payment date			Dec. 20, 2017
Fourth Quarter 2017 [Member]
Dividends Payable [Line Items]
Declaration date		Jan. 26, 2018
Dividend per share		$ 0.1700
Record date		Feb. 16, 2018
Total dividends		$ 18,246
Payment date		Mar. 9, 2018
First Quarter 2018 [Member]
Dividends Payable [Line Items]
Declaration date		May 9, 2018
Dividend per share		$ 0.1700
Record date		May 30, 2018
Total dividends		$ 18,342
Payment date		Jun. 20, 2018
Second Quarter 2018 [Member]
Dividends Payable [Line Items]
Declaration date		Aug. 7, 2018
Dividend per share		$ 0.1800
Record date		Aug. 29, 2018
Total dividends		$ 19,528
Payment date		Sep. 19, 2018
Third Quarter 2018 [Member]
Dividends Payable [Line Items]
Declaration date		Nov. 8, 2018
Dividend per share		$ 0.1800
Record date		Nov. 28, 2018
Total dividends		$ 19,562
Payment date		Dec. 19, 2018

Share-Based Payments (Narrative

Share-Based Payments (Narrative) (Details)	Sep. 11, 2018USD ($)$ / shares	Mar. 01, 2018USD ($)$ / shares	May 01, 2017USD ($)$ / shares	Aug. 11, 2014shares	Dec. 31, 2018USD ($)item$ / sharesshares	Dec. 31, 2017USD ($)$ / sharesshares	Dec. 31, 2016USD ($)$ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum employee contribution, percentage					4.00%
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employer matching contribution, percentage					50.00%
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employer matching contribution, percentage					100.00%
Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period					5 years
Award term					10 years
Remaining shares authorized for grant | shares					2,478,321	3,402,481
Weighted average share price of options exercised | $ / shares					$ 35.08	$ 30.81	$ 31.18
Weighted average grant date fair value of options granted | $ / shares					$ 7.69	$ 7.22	$ 4.72
Unrecognized compensation costs					$ 4,702,000
Unrecognized compensation costs, period for recognition					1 year 10 months 24 days
Proceeds from exercise of employee stock options					$ 28,524,000	$ 9,936,000	$ 24,338,000
Actual tax benefit realized from option exercise					$ 2,793,000	1,017,000	1,464,000
Performance Share Unit Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period					3 years
Market value of shares vested and released					$ 410,000	6,521,000	$ 4,463,000
Share unit liability, fair value attributable to past service		$ 6,701,000
Modified Performance Vesting Conditions, Weighted Average Fair Value | $ / shares		$ 31.35
Modified Performance Vesting Conditions, Incremental Compensation Recognized		$ 1,400,000
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of plans | item					3
Stock Options Assumed [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average share price of options assumed | $ / shares					$ 16.93
Performance Share Units, Equity Classified Awards [Member] | Senior Executive and Employee Performance Share Unit Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Modified Performance Vesting Conditions, Weighted Average Fair Value | $ / shares			$ 24.47
Modified Performance Vesting Conditions, Incremental Compensation Recognized			$ 1,803,000
Performance Share Units [Member] | Senior Executive and Employee Performance Share Unit Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, Shares | shares				102,375
Unrecognized compensation costs					$ 7,874,000
Unrecognized compensation costs, period for recognition					1 year 8 months 12 days
Shares to be issued for settlement.			150,000
Performance Share Units [Member] | Senior Executive and Employee Performance Share Unit Plans [Member] | Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period					2 years
Performance Share Units [Member] | Senior Executive and Employee Performance Share Unit Plans [Member] | Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period					3 years
Performance Share Units [Member] | Senior Executive and Employee Performance Share Unit Plans [Member] | Tranche Three [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period					4 years
Performance Share Units [Member] | Senior Executive and Employee Performance Share Unit Plans [Member] | Tranche Four [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period					5 years
Performance Share Units [Member] | Sign-on Grant Performance Share Unit Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Modified Performance Vesting Conditions, Weighted Average Fair Value | $ / shares	$ 43.34
Modified Performance Vesting Conditions, Incremental Compensation Recognized	$ 838,000
Performance Shares, Liability Classified [Member] | Senior Executive and Employee Performance Share Unit Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share unit liability			$ 1,421,000
Restricted Share Units [Member] | Senior Executive and Employee Performance Share Unit Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs					$ 3,994,000
Unrecognized compensation costs, period for recognition					2 years
Deferred Share Units [Member] | Senior Executive and Employee Performance Share Unit Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs					$ 0
Share unit liability					$ 3,714,000	$ 2,645,000

Share-Based Payments (Compensat

Share-Based Payments (Compensation Costs Related To Share-Based Payments) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock option compensation expense	$ 8,252	$ 13,700	$ 5,507
Equity-classified share units	11,256	3,529	1,981
Liability-classified share units	1,764	670	10,512
Employee share purchase plan - employer contributions	2,174	1,813	1,597
Total compensation costs related to share based payments	23,446	19,712	19,597
Selling, General and Administrative Expenses [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock option compensation expense	7,895	8,948	$ 5,507
Acquisition-related Costs [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock option compensation expense	$ 357	$ 4,752

Share-Based Payments (Summary o

Share-Based Payments (Summary of Stock Option Activity) (Details) - Stock Option Plan [Member] - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding beginning balance, Common shares under option	4,459,744	3,366,714	3,276,078
Granted, Common shares under option	923,199	970,947	1,268,101
Assumed in acquisition, Common shares under option		737,358
Exercised, Common shares under option	(1,235,154)	(444,571)	(1,081,531)
Forfeited, Common shares under option	(132,624)	(170,704)	(95,934)
Expired, Common shares under option	(1,302)
Outstanding ending balance, Common shares under option	4,013,863	4,459,744	3,366,714
Exercisable, Common shares under option	2,074,873
Outstanding beginning balance, Weighted average exercise price (per share)	$ 24.29	$ 24.02	$ 23.40
Granted, Weighted average exercise price (per share)	32.14	31.07	24.34
Assumed in acquisition, Weighted average exercise price (per share)		14.26
Exercised, Weighted average exercise price (per share)	23.10	22.35	22.50
Forfeited, Weighted average exercise price (per share)	25.91	19.38	24.32
Expired, Weighted average exercise price (per share)	25.76
Outstanding ending balance, Weighted average exercise price (per share)	26.41	$ 24.29	$ 24.02
Exercisable, Weighted average exercise price (per share)	$ 24.06
Outstanding, Weighted average remaining contractual life (in years)	7 years 2 months 12 days	7 years 6 months	7 years 6 months
Exercisable, Weighted average remaining contractual life (in years)	6 years 2 months 12 days
Outstanding beginning balance, Aggregate intrinsic value	$ 17,649	$ 33,601
Exercised, Aggregate intrinsic value	14,808	3,762	$ 9,380
Outstanding ending balance, Aggregate intrinsic value	25,374	$ 17,649	$ 33,601
Exercisable, Aggregate intrinsic value	$ 17,963

Share-Based Payments (Summary_2

Share-Based Payments (Summary of Stock Option and Performance Share Unit Pricing Assumptions) (Details)	Sep. 11, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk free interest rate		2.70%	2.00%	1.20%
Expected dividend yield		2.11%	2.15%	2.66%
Expected lives		5 years	5 years	5 years
Expected volatility		28.10%	27.80%	26.50%
Stock Options Assumed [Member] | Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk free interest rate		0.80%
Expected dividend yield		2.19%
Expected lives		4 months 24 days
Expected volatility		32.10%
Performance Share Units [Member] | Senior Executive and Employee Performance Share Unit Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk free interest rate		1.92%	1.40%	1.20%
Expected dividend yield		2.09%	1.92%	2.50%
Expected lives		3 years	3 years	3 years
Expected volatility		31.10%	28.20%	29.90%
Average expected volatility of comparable companies		34.10%	37.00%	37.00%
Performance Share Units [Member] | Sign-on Grant Performance Share Unit Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk free interest rate	2.70%
Expected dividend yield	1.53%
Expected lives	1 year
Expected volatility	29.20%
Performance Share Units, Equity Classified Awards [Member] | Senior Executive and Employee Performance Share Unit Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk free interest rate		1.50%	1.20%
Expected dividend yield		2.01%	2.40%
Expected lives		3 years	3 years
Expected volatility		28.90%	29.70%
Average expected volatility of comparable companies		33.40%	37.00%

Share-Based Payments (Summary_3

Share-Based Payments (Summary of Share Unit Activity) (Details) - Performance Share Unit Plans [Member] - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Performance Share Units [Member] | Equity Securities [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding beginning balance, Shares	434,248	243,968
Granted, Shares	240,803	136,073	7,714
Transferred to (from) equity awards on modification, Shares	257,659	81,533	257,934
Vested and settled, Shares	(212,263)	(27,326)
Forfeited, Shares	(50,159)		(21,680)
Outstanding ending balance, Shares	670,288	434,248	243,968
Outstanding beginning balance, Weighted average grant date fair value (per share)	$ 27.83	$ 27.48
Granted, Weighted average grant date fair value (per share)	35.63	30.28	31.40
Transferred to (from) equity awards on modification, WA grant date fair value (per share)	31.30	24.47	27.34
Vested and settled, Weighted average grant date fair value (per share)	33.78	26.82
Forfeited, Weighted average grant date fair value (per share)	31.41		27.43
Outstanding ending balance, Weighted average grant date fair value (per share)	$ 31.46	$ 27.83	$ 27.48
Performance Share Units [Member] | Debt securities
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding beginning balance, Shares	259,241	311,329	421,585
Granted, Shares		98,775	257,117
Transferred to (from) equity awards on modification, Shares	(257,659)	(81,533)	(257,934)
Vested and settled, Shares		(49,873)	(68,683)
Forfeited, Shares	(1,582)	(19,457)	(40,756)
Outstanding ending balance, Shares		259,241	311,329
Outstanding beginning balance, Weighted average grant date fair value (per share)	$ 26.38	$ 23.96	$ 24.03
Granted, Weighted average grant date fair value (per share)		31.21	23.32
Transferred to (from) equity awards on modification, WA grant date fair value (per share)	26.38	24.66	23.86
Vested and settled, Weighted average grant date fair value (per share)		23.64	23.08
Forfeited, Weighted average grant date fair value (per share)	26.45	26.39	22.75
Outstanding ending balance, Weighted average grant date fair value (per share)		$ 26.38	$ 23.96
Restricted Share Units [Member] | Equity Securities [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding beginning balance, Shares	125,152
Granted, Shares	91,251	125,152
Transferred to (from) equity awards on modification, Shares
Vested and settled, Shares
Forfeited, Shares	(8,417)
Outstanding ending balance, Shares	207,986	125,152
Outstanding beginning balance, Weighted average grant date fair value (per share)	$ 26.93
Granted, Weighted average grant date fair value (per share)	32.10	26.93
Transferred to (from) equity awards on modification, WA grant date fair value (per share)
Vested and settled, Weighted average grant date fair value (per share)
Forfeited, Weighted average grant date fair value (per share)	32
Outstanding ending balance, Weighted average grant date fair value (per share)	$ 28.99	$ 26.93
Restricted Share Units [Member] | Debt securities
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding beginning balance, Shares	4,666	160,009	332,954
Granted, Shares	66	878	4,543
Transferred to (from) equity awards on modification, Shares
Vested and settled, Shares	(4,732)	(156,221)	(162,306)
Forfeited, Shares			(15,182)
Outstanding ending balance, Shares		4,666	160,009
Outstanding beginning balance, Weighted average grant date fair value (per share)	$ 26.42	$ 23.37	$ 22.70
Granted, Weighted average grant date fair value (per share)	34.70	32.30	29.33
Transferred to (from) equity awards on modification, WA grant date fair value (per share)
Vested and settled, Weighted average grant date fair value (per share)	26.54	23.33	22.23
Forfeited, Weighted average grant date fair value (per share)			22.68
Outstanding ending balance, Weighted average grant date fair value (per share)		$ 26.42	$ 23.37
Deferred Share Units [Member] | Debt securities
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding beginning balance, Shares	93,487	73,520	57,996
Granted, Shares	26,553	19,967	17,371
Transferred to (from) equity awards on modification, Shares
Vested and settled, Shares	(6,605)		(1,847)
Forfeited, Shares
Outstanding ending balance, Shares	113,435	93,487	73,520
Outstanding beginning balance, Weighted average grant date fair value (per share)	$ 26.32	$ 25.41	$ 24.21
Granted, Weighted average grant date fair value (per share)	33.42	29.67	29.41
Transferred to (from) equity awards on modification, WA grant date fair value (per share)
Vested and settled, Weighted average grant date fair value (per share)	23.16		25.28
Forfeited, Weighted average grant date fair value (per share)
Outstanding ending balance, Weighted average grant date fair value (per share)	$ 28.16	$ 26.32	$ 25.41

Commitments (Narrative) (Detail

Commitments (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)item	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Commitments [Line Items]
Capital expenditures committed, but not yet incurred	$ 1,151	$ 1,612
Future minimum sublease payments expected to be received	1,187	1,936	$ 577
Lease expenditure	27,734	21,956	$ 20,075
Net carrying capital lease amount	14,976	10,692
Purchase commitment amount purchased	$ 35,900
Minimum [Member]
Commitments [Line Items]
Operating lease fixed term	1 month
Capital lease fixed term	1 month
Purchase commitment quantity | item	150,000
Purchase commitment	$ 11,104
Maximum [Member]
Commitments [Line Items]
Operating lease fixed term	20 years
Capital lease fixed term	4 years
Purchase commitment quantity | item	245,900
Purchase commitment	$ 51,028
Computer and Yard Equipment [Member]
Commitments [Line Items]
Net carrying capital lease amount	$ 14,976	$ 10,692

Commitments (Schedule of Future

Commitments (Schedule of Future Minimum Rental Payments for Operating Leases) (Details) $ in Thousands	Dec. 31, 2018USD ($)
Commitments [Abstract]
2,019	$ 15,988
2,020	13,276
2,021	10,554
2,022	8,317
2,023	6,560
Thereafter	42,333
Total future minimum lease payments	$ 97,028

Commitments (Schedule of Futu_2

Commitments (Schedule of Future Minimum Lease Payments for Capital Leases) (Details) $ in Thousands	Dec. 31, 2018USD ($)
Commitments [Abstract]
2,019	$ 5,480
2,020	4,564
2,021	3,327
2,022	2,023
2,023	814
Total future minimum capital lease payments	$ 16,208

Commitments (Schedule of Capita

Commitments (Schedule of Capital Leased Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Capital Leased Assets [Line Items]
Cost	$ 21,553	$ 15,192
Accumulated depreciation	(6,577)	(4,500)
Net book value	14,976	10,692
Computer Software and Equipment [Member]
Capital Leased Assets [Line Items]
Cost	9,428	8,699
Accumulated depreciation	(3,992)	(3,604)
Net book value	5,436	5,095
Yard and Auto Equipment [Member]
Capital Leased Assets [Line Items]
Cost	12,125	6,493
Accumulated depreciation	(2,585)	(896)
Net book value	$ 9,540	$ 5,597

Contingencies (Details)

Contingencies (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Contingencies [Abstract]
Assets guaranteed under contract	$ 41,461	$ 30,948
Percentage of assets expected to be sold	51.00%	27.00%

Selected Quarterly Financial _3

Selected Quarterly Financial Data (Schedule of Quarterly Results) (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, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Selected Quarterly Financial Data [Abstract]
Total revenues	$ 355,972	$ 245,346	$ 308,530	$ 260,178	$ 291,750	$ 227,401	$ 252,613	$ 199,427	$ 294,830	$ 300,976	$ 275,667	$ 255,504	$ 1,170,026	$ 971,191	$ 1,126,977
Operating income	56,327	31,194	64,795	32,873	40,038	16,931	26,888	23,597	40,628	2,285	53,635	39,174	185,189	107,454	135,722
Net income	35,460	23,112	45,727	17,207	36,837	10,323	17,713	10,433	27,927	(5,000)	40,591	29,994	121,506	75,306	93,512
Net income (loss)	$ 35,486	$ 23,138	$ 45,717	$ 17,138	$ 36,754	$ 10,261	$ 17,635	$ 10,377	$ 27,853	$ (5,137)	$ 39,710	$ 29,406	$ 121,479	$ 75,027	$ 91,832
Basic, Per share amount	$ 0.33	$ 0.21	$ 0.42	$ 0.16	$ 0.34	$ 0.10	$ 0.16	$ 0.10	$ 0.26	$ (0.05)	$ 0.37	$ 0.28	$ 1.12	$ 0.70	$ 0.86
Diluted, Per share amount	$ 0.32	$ 0.21	$ 0.42	$ 0.16	$ 0.34	$ 0.09	$ 0.16	$ 0.10	$ 0.26	$ (0.05)	$ 0.37	$ 0.27	$ 1.11	$ 0.69	$ 0.85

Business Combinations (Narrativ

Business Combinations (Narrative) (Details) - USD ($) $ in Thousands	May 31, 2017	Mar. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Goodwill			$ 671,594	$ 670,922	$ 97,537
Iron Planet Holdings Inc. [Member]
Business Acquisition [Line Items]
Voting equity interests acquired, percentage	100.00%
Cash consideration	$ 772,706
Total consideration	776,474
Cash consideration, placed in escrow	35,000
Noncash consideration	2,330
Consideration, placed in escrow	1,771
Amount released from escrow		$ 36,771
Cash related to customary adjustments	333
Goodwill	568,566
Iron Planet Holdings Inc. [Member] | Consolidation, Eliminations [Member]
Business Acquisition [Line Items]
Consideration, placed in escrow	$ 333

Business Combinations (Schedule

Business Combinations (Schedule of Net Cash Flows and Purchase Price) (Details) - Iron Planet Holdings Inc. [Member] - USD ($) $ in Thousands	May 31, 2017	Dec. 31, 2017
Business Acquisition [Line Items]
Cash consideration paid to former equity holders	$ 723,810
Settlement of IronPlanet's debt	36,313
Settlement of IronPlanet's transaction costs	12,583
Cash consideration paid on closing	772,706
Cash Consideration Paid Related To Closing Adjustments	1,771
Less: cash and cash equivalents acquired	(95,626)
Less: restricted cash acquired	(3,000)
Acquisition of IronPlanet, net of cash acquired	675,851	$ 675,851
Replacement stock option awards attributable to pre-combination services	4,926
Stock option compensation expense from accelerated vesting of awards attributable to post-combination services	(2,596)
Cash consideration paid relating to closing adjustments	1,771
Settlement of pre-existing intercompany balances	(333)
Purchase price	$ 776,474

Business Combinations (Schedu_2

Business Combinations (Schedule of Assets Acquired and Liabilities Assumed) (Details) - USD ($) $ in Thousands	May 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Goodwill acquired on acquisition		$ 671,594	$ 670,922	$ 97,537
Technology [Member]
Business Acquisition [Line Items]
Amortization life		7 years
Iron Planet Holdings Inc. [Member]
Business Acquisition [Line Items]
Purchase price	$ 776,474
Cash and cash equivalents	95,626
Restricted cash	3,000
Trade and other receivables	13,021
Inventory	600
Advances against auction contracts	4,623
Prepaid expenses and deposits	1,645
Income taxes receivable	55
Property, plant and equipment	2,381
Other non-current assets	2,551
Deferred tax assets	1,497
Intangible assets	188,000
Auction proceeds payable	63,616
Trade and other payables	15,540
Deferred tax liabilities	25,935
Fair value of identifiable net assets acquired	207,908
Goodwill acquired on acquisition	$ 568,566
Minimum [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Amortization life		6 years
Maximum [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Amortization life		13 years