Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Operating activities:
Net income	$ 29,994	$ 24,110
Adjustments for items not affecting cash:
Depreciation and amortization expenses	10,080	10,616
Inventory write down (note 13)		60
Stock option compensation expense (note 21)	1,070	723
Deferred income tax recovery	(477)	(1,280)
Equity income less dividends received	(519)	(233)
Unrealized foreign exchange gain	(621)	(996)
Gain on disposition of property, plant and equipment	(246)	(175)
Net changes in operating assets and liabilities (note 11)	94,733	77,409
Net cash provided by operating activities	134,014	110,234
Investing activities:
Acquisition of Mascus (note 23)	(27,812)
Property, plant and equipment additions	(2,444)	(3,327)
Intangible asset additions	(3,711)	(2,419)
Proceeds on disposition of property, plant and equipment	824	773
Other, net	(173)
Net cash used in investing activities	(33,316)	(4,973)
Financing activities:
Issuances of share capital	3,031	4,421
Share repurchase (note 20)	(36,726)	(47,489)
Dividends paid to stockholders (note 20)	(17,154)	(15,089)
Dividends paid to contingently redeemable non-controlling interests	(2,296)	(1,340)
Proceeds from short-term debt	30,179
Repayment of short-term debt	(2,283)	(185)
Repayment of finance lease obligations	(493)	(532)
Other, net	32	(105)
Net cash used in financing activities	(25,710)	(60,319)
Effect of changes in foreign currency rates on cash and cash equivalents	8,938	(8,497)
Increase in cash and cash equivalents	83,926	36,445
Cash and cash equivalents, beginning of year	210,148	139,815
Cash and cash equivalents, end of year	$ 294,074	$ 176,260