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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Operating activities:    
Net income $ 88,920 $ 75,948
Adjustments for items not affecting cash:    
Depreciation and amortization expenses 43,005 37,150
Stock-based compensation expense 16,183 7,747
Deferred income tax expense 1,719 6,657
Unrealized foreign exchange loss (65) 1,129
Gain on disposition of property, plant and equipment (243) (1,260)
Amortization of debt issuance costs 1,443 1,577
Amortization of right-of-use assets 6,280 6,318
Gain on contingent consideration from equity investment   (1,700)
Other, net 1,568 1,934
Net changes in operating assets and liabilities 52,577 62,824
Net cash provided by operating activities 211,387 198,324
Investing activities:    
Acquisition of Rouse, net of cash acquired 728  
Property, plant and equipment additions (4,616) (6,140)
Proceeds on disposition of property, plant and equipment 342 16,106
Intangible asset additions (17,361) (13,244)
Issuance of loans receivable (2,622) (2,985)
Repayment of loans receivable 226 203
Distribution from equity investment   4,212
Proceeds on contingent consideration from equity investment   1,700
Net cash used in investing activities (23,303) (148)
Financing activities:    
Share repurchase   (53,170)
Dividends paid to stockholders (48,537) (43,586)
Dividends paid to NCI (26)  
Proceeds from exercise of options and share option plans 10,699 19,425
Payment of withholding taxes on issuance of shares (9,155) (3,321)
Net increase (decrease) in short-term debt 6,842 15,858
Repayment of long-term debt (5,328) (8,633)
Repayment of finance lease obligations (5,355) (4,384)
Net cash used in financing activities (50,860) (77,811)
Effect of changes in foreign currency rates on cash, cash equivalents, and restricted cash (1,396) (2,608)
Increase 135,828 117,757
Beginning of period 306,895 420,256
Cash, cash equivalents, and restricted cash, end of period $ 442,723 $ 538,013