Basis of Presentation - Schedule of Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
SUPPLEMENTAL CASH FLOW INFORMATION:
Interest paid	$ 4,712	$ 3,218
Income taxes paid, including foreign withholding taxes	13,788	9,770
Non-cash investing and financing activities:
Dividend payable	10,781	10,895	$ 10,746
Increases in noncontrolling interests	0	2,500
Accrued debt issuance costs	0	(1,075)
Non-cash acquisition of patents	33,300	0
Accrued capitalized patent costs and property and equipment	$ (742)	$ (1,910)