Supplemental Cash Flow Information (Tables)

12 Months Ended

Dec. 31, 2017

Supplemental Cash Flow Information [Abstract]

Schedule of Net Changes in Operating Assets and Liabilities

Year ended December 31,		2017		2016		2015
Trade and other receivables		(19,161)		6,419		12,757
Inventory		(8,557)		26,557		(17,635)
Advances against auction contracts		3,246		(1,012)		20,804
Prepaid expenses and deposits		1,178		(7,443)		(307)
Income taxes receivable		(6,067)		(10,686)		742
Auction proceeds payable		25,783		550		5,151
Trade and other payables		20,552		5,627		(7,654)
Income taxes payable		(3,986)		(8,657)		3,481
Share unit liabilities		(5,421)		4,503		5,397
Other		1,410		(5,176)		2,398
Net changes in operating
assets and liabilities	$	8,977	$	10,682	$	25,134

Schedule of Supplemental Cash Flow

Year ended December 31,		2017		2016		2015
Interest paid, net of interest capitalized	$	23,360	$	5,792	$	4,989
Interest received		3,196		1,861		2,657
Net income taxes paid		28,281		54,037		34,661
Non-cash transactions:
Non-cash purchase of property, plant
and equipment under capital lease		8,820		3,376		943

Schedule of Cash, Cash Equivalents and Restricted Cash

As at December 31,		2017		2016		2015
Cash and cash equivalents	$	267,910	$	207,867	$	210,148
Restricted cash:
Current		63,206		50,222		83,098
Non-current		-		500,000		-
Cash, cash equivalents, and restricted cash	$	331,116	$	758,089	$	293,246