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Financial instruments (Details 6) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Disclosure of financial instruments [Line Items]    
Amortized Cost [1] $ 68,934 $ 77,214
Fair Value 25,135 30,607
Due within 1 year [member]    
Disclosure of financial instruments [Line Items]    
Amortized Cost 0 0
Fair Value 0 0
After 1 year but within 5 years [member]    
Disclosure of financial instruments [Line Items]    
Amortized Cost 16,962 17,656
Fair Value 16,733 16,994
After 5 years but within 10 years [member]    
Disclosure of financial instruments [Line Items]    
Amortized Cost 0 13,736
Fair Value 0 13,613
Total Maturities [Member]    
Disclosure of financial instruments [Line Items]    
Amortized Cost 16,962 31,392
Fair Value $ 16,733 $ 30,607
[1] The carrying value of securities at amortized cost is net of the allowance for expected credit losses of $0.2 million for December 31, 2017 and $0.6 million for December 31, 2016.