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Basis of presentation for the consolidated financial statements (Details 2) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Expenses      
Other expenses by function   $ 8,038 $ 7,198
Net gains on reversal (losses) on impairment of financial assets $ (2,967) 8,038 7,198
Sub total $ (1,638,557) (1,549,593) (1,499,254)
Originally reported [Member]      
Expenses      
Other expenses by function   (61,638) (89,731)
Net gains on reversal (losses) on impairment of financial assets   0 0
Sub total   (61,638) (89,731)
Reclassification balances [Member]      
Expenses      
Other expenses by function   (53,600) (82,533)
Net gains on reversal (losses) on impairment of financial assets   (8,038) (7,198)
Sub total   $ (61,638) $ (89,731)