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Other Assets (Notes Receivable Due From Equity Investments) (Details) - Equity Investment - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total notes receivable due from equity investments $ 201,979 $ 314,323
Less-current portion 19,075 38,658
Long-term portion $ 182,904 $ 275,665