Dispositions and Held for Sale - Held-for-Sale Activity (Details) - USD ($) $ in Thousands		Sep. 30, 2019	Dec. 31, 2018
Long Lived Assets Held-for-sale [Line Items]
Total Assets	[1]	$ 0	$ 30,971

[1] As of September 30, 2019, includes $484,345 of assets related to consolidated variable interest entities that can be used only to settle obligations of the consolidated variable interest entities and $346,999 of liabilities of consolidated variable interest entities for which creditors do not have recourse to the general credit of the Company. See Note 7.