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Basis of Presentation - Schedule of Supplemental Cash Flow Information (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
SUPPLEMENTAL CASH FLOW INFORMATION:      
Interest paid $ 4,712 $ 3,930  
Income taxes paid, including foreign withholding taxes 18,211 16,483  
Non-cash investing and financing activities:      
Dividend payable 10,782 10,897 $ 10,746
Increases in noncontrolling interests 0 13,750  
Non-cash acquisition of patents 33,300 22,500  
Accrued capitalized patent costs and property and equipment $ (419) $ 390