Investments Cash Distributions from Equity Method Investments (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Equity Method Investments and Joint Ventures [Abstract]
Cash distributions from equity investments	$ 43,789	$ 38,141	$ 158,926	$ 149,650

Proceeds from Equity Method Investment, Cash Distributions

No definition available.

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