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Restricted Cash (Narrative) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Restricted Cash And Cash Equivalents Items [Line Items]      
Restricted cash $ 3,030 $ 3,030 $ 3,030
Reserve required by local Goverment 212,200 211,600  
Certificate of Deposit and Other [Member]      
Restricted Cash And Cash Equivalents Items [Line Items]      
Restricted cash 305 325  
Derivatives [Member]      
Restricted Cash And Cash Equivalents Items [Line Items]      
Restricted cash 1,980 1,980  
Obligations Under Agreement of Loans Sold with Recourse [Member]      
Restricted Cash And Cash Equivalents Items [Line Items]      
Restricted cash $ 1,050 $ 1,050