Investments Equity Method Investments Table (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Investments [Abstract]
Income from equity investments, net, before amortization of basis difference	$ 53,311	$ 57,950	$ 106,199	$ 109,873
Amortization of basis difference	(12,550)	(13,644)	(28,401)	(27,315)
Income from equity investments, net	$ 40,761	$ 44,306	$ 77,798	$ 82,558