Investments Total Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Investments [Abstract]
Equity method investments	$ 1,636,068	$ 1,668,316
Cost method investments	24,248	20,868
Marketable equity securities	7,095	3,516
Total investments	$ 1,667,411	$ 1,692,700