Investments Equity Method Investments Table (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Investments [Abstract]
Income from equity investments, net, before amortization of basis difference	$ 33,609	$ 45,381	$ 139,808	$ 155,254
Amortization of basis difference	(12,551)	(13,644)	(40,952)	(40,959)
Income from equity investments, net	$ 21,058	$ 31,737	$ 98,856	$ 114,295