Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2018

Investments, Debt and Equity Securities [Abstract]

Schedule of debt securities available for sale

	December 31, 2018								December 31, 2017
	Amortized Costs		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value		Amortized Costs		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Certificates of deposit (non-U.S.)	$	5,538	$	—	$	—	$	5,538	$	12,809	$	—	$	—		$	12,809
Corporate bonds		—		—		—		—		11,003		86		(24	)		11,065
Total	$	5,538	$	—	$	—	$	5,538	$	23,812	$	86	$	(24	)	$	23,874

Schedule of long term investments

	As of December 31, 2018		As of December 31, 2017
Equity investments:
Marketable equity securities	$	5,562	$	5,718
Non-marketable equity securities		9,987		10,092
Equity method investments		12,507		22,021
Other investments		17,239		33,251
Total	$	45,295	$	71,082

Schedule of sale and/or maturity of available-for-sale securities

	Years Ended December 31,
	2018		2017		2016
Proceeds from sales	$	79,473	$	165,301	$	25,931
Gross gains		5		16		33
Gross losses		—		—		—

Schedule of ownership structure and ownership percentage of the non-consolidated investments

Name of Investee	Ownership Structure	% Ownership
MPEG LA	Limited Liability Company		8.4	%
Music Choice	Limited Liability Partnership		18.2	%
Conditional Access Licensing (“CAL”)	Limited Liability Company		49.0	%