Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating activities:
Net income	$ 138,575	$ 92,563	$ 94,445
Adjustments for items not affecting cash:
Depreciation and amortization expenses	42,032	44,536	43,280
Inventory write down (note 13)	480	2,177	963
Impairment loss (note 6)		8,084
Stock option compensation expense (note 25)	4,001	3,710	4,504
Deferred income tax expense (recovery) (note 7)	(4,559)	3,154	3,401
Equity income less dividends received	(916)	(458)	(405)
Unrealized foreign exchange loss	1,403	562	486
Gain on disposition of property, plant and equipment	(9,691)	(3,512)	(10,552)
Net changes in operating assets and liabilities (note 10)	25,032	20,550	10,517
Net cash provided by operating activities	196,357	171,366	146,639
Investing activities:
Acquisition of Xcira (note 29)	(12,107)
Acquisition of equity investments	(3,000)
Property, plant and equipment additions	(22,055)	(24,990)	(35,896)
Intangible asset additions	(8,764)	(13,935)	(15,662)
Proceeds on disposition of property, plant and equipment	16,667	9,330	14,492
Proceeds from note receivable and other assets			9,276
Other, net	(89)	(529)	260
Net cash used in investing activities	(29,348)	(30,124)	(27,530)
Financing activities:
Issuances of share capital	29,816	12,121	6,152
Share repurchase	(47,489)
Dividends paid to stockholders	(64,340)	(57,929)	(53,918)
Dividends paid to contingently redeemable non-controlling interests	(1,340)
Proceeds from short-term debt	11,038	45,751	19,102
Repayment of short-term debt	(6,373)	(41,066)	(53,254)
Repayment of long-term debt		(58,409)	(15,000)
Repayment of finance lease obligations	(2,073)	(1,953)	(1,103)
Other, net	72	(148)	101
Net cash used in financing activities	(80,689)	(101,633)	(97,920)
Effect of changes in foreign currency rates on cash and cash equivalents	(15,987)	(14,390)	1,006
Increase in cash and cash equivalents	70,333	25,219	22,195
Cash and cash equivalents, beginning of year	139,815	114,596	92,401
Cash and cash equivalents, end of year	$ 210,148	$ 139,815	$ 114,596