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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Operating activities:      
Net income $ 151,854 $ 170,358 $ 149,140
Adjustments for items not affecting cash:      
Depreciation and amortization expenses 87,889 74,921 70,501
Share-based payments expense 31,335 16,552 12,744
Deferred income tax expense 3,859 9,152 8,826
Unrealized foreign exchange (gain) loss (107) 2,453 (3,058)
Gain on disposition of property, plant and equipment (1,436) (1,559) (1,107)
Amortization of debt issuance costs 2,926 3,123 4,086
Amortization of right-of-use assets 12,832 12,240 12,280
Gain on contingent consideration from equity investment   (1,700)  
Change in fair value of derivatives 1,248    
Other, net 2,752 1,466 2,779
Net changes in operating assets and liabilities 24,434 (29,134) 76,602
Net cash provided by operating activities 317,586 257,872 332,793
Investing activities:      
Acquisition, net of cash acquired (170,976) (250,039)  
Property, plant and equipment additions (9,816) (14,263) (13,589)
Proceeds on disposition of property, plant and equipment 1,911 16,385 5,929
Intangible asset additions (33,671) (28,873) (27,415)
Issuance of loans receivable (2,622) (9,071)  
Repayment of loans receivable 1,108 3,227  
Distribution from equity investment   4,212  
Proceeds on contingent consideration from equity investment   1,700  
Other, net     (982)
Net cash used in investing activities (214,066) (276,722) (36,057)
Financing activities:      
Share repurchase   (53,170) (42,012)
Dividends paid to stockholders (103,797) (91,737) (82,535)
Acquisition of remaining interest in NCI (5,556)    
Dividends paid to NCI (104) (320)  
Proceeds from exercise of options and share option plans 16,250 44,128 41,094
Payment of withholding taxes on issuance of shares (9,283) (6,656) (5,260)
Net increase (decrease) in short-term debt (21,608) 21,431 (15,515)
Proceeds from long-term debt 1,106,957    
Repayment of long-term debt (5,328) (13,711) (76,282)
Debt issue costs (5,655) (2,038)  
Repayment of finance lease obligations (10,968) (9,388) (6,708)
Net cash used in financing activities 960,908 (111,461) (187,218)
Effect of changes in foreign currency rates on cash, cash equivalents, and restricted cash (8,871) 16,950 5,171
Increase 1,055,557 (113,361) 114,689
Beginning of period 306,895 420,256 305,567
Cash, cash equivalents, and restricted cash, end of period $ 1,362,452 $ 306,895 $ 420,256