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Basis of Presentation (Tables)
 9 Months Ended
Sep. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of supplemental cash flow information
The following table presents additional supplemental cash flow information for the nine months ended September 30, 2019 and 2018 (in thousands):
 
FOR THE NINE MONTHS ENDED SEPTEMBER 30,
SUPPLEMENTAL CASH FLOW INFORMATION:
2019
 
2018
Interest paid
$
3,930

 
$
4,740

Income taxes paid, including foreign withholding taxes
16,483

 
24,459

Non-cash investing and financing activities:
 
 
 
Dividend payable
10,897

 
11,996

Increases in noncontrolling interests
13,750

 
—

Non-cash acquisition of patents
22,500

 
—

Accrued capitalized patent costs and property and equipment
390

 
(1,513
)