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Summary of Significant Accounting Policies Summary of Significant Accounting Policies - Variable Interest Entities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Accounting Policies [Abstract]    
Investment in unconsolidated entities $ 14,240 $ 37,228
Goodwill 8,754 8,754
Derivative assets 12,586 5,935
Other 25,558 25,297
Prepaid expenses and other assets, net $ 61,138 $ 77,214