Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating activities:
Net income	$ 149,140	$ 121,506	$ 75,306
Adjustments for items not affecting cash:
Depreciation and amortization expenses	70,501	66,614	52,694
Impairment loss	0	0	8,911
Stock option compensation expense	4,697	8,252	13,700
Equity-classified share units expense	8,047	11,256	3,529
Deferred income tax expense (recovery)	8,826	6,239	(17,268)
Unrealized foreign exchange (gain) loss	(3,058)	951	254
Gain on disposition of property, plant and equipment	(1,107)	(2,731)	(1,656)
Amortization of debt issuance costs	4,086	4,995	3,056
Gain on disposition of equity investment		(4,935)
Amortization of right-of-use assets	12,280
Other, net	2,779	(2,317)	(1,237)
Net changes in operating assets and liabilities	76,602	(65,550)	10,279
Net cash provided by operating activities	332,793	144,280	147,568
Investing activities:
Acquisition of IronPlanet, net of cash acquired			(675,851)
Property, plant and equipment additions	(13,589)	(16,860)	(10,812)
Intangible asset additions	(27,415)	(26,152)	(28,584)
Proceeds on disposition of property, plant and equipment	5,929	10,586	4,985
Proceeds on disposal of equity investment		6,147
Other, net	(982)	(4,674)	(692)
Net cash used in investing activities	(36,057)	(30,953)	(710,954)
Financing activities:
Share repurchase	(42,012)
Dividends paid to stockholders	(82,535)	(75,678)	(72,785)
Dividends paid to NCI			(41)
Issuances of share capital	41,094	28,524	9,936
Payment of withholding taxes on issuance of shares	(5,260)	(3,901)
Proceeds from short-term debt	13,169	19,715	6,971
Repayment of short-term debt	(28,684)	(6,628)	(24,479)
Proceeds from long-term debt			325,000
Repayment of long-term debt	(76,282)	(91,013)	(108,985)
Debt issue costs			(12,624)
Repayment of finance lease obligations	(6,708)	(3,950)	(2,322)
Other, net		(1,176)	(1,408)
Net cash provided by (used in) financing activities	(187,218)	(134,107)	119,263
Effect of changes in foreign currency rates on cash, cash equivalents, and restricted cash	5,171	(4,769)	17,150
Increase (decrease)	114,689	(25,549)	(426,973)
Beginning of period	305,567	331,116	758,089
Cash, cash equivalents, and restricted cash, end of period	$ 420,256	$ 305,567	$ 331,116