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Basis of Presentation (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2019 USD ($) segment	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of reportable segments | segment	1
SUPPLEMENTAL CASH FLOW INFORMATION:
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	$ 11,627
Increases in noncontrolling interests	13,750	0
Non-cash acquisition of patents	22,500	0
Accrued capitalized patent costs and property and equipment	$ 390	$ (1,513)

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