Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Fair value measurements (Financial assets and liabilities measured at fair value on recurring basis) (Details)

v3.19.3.a.u2
Fair value measurements (Financial assets and liabilities measured at fair value on recurring basis) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Assets    
Derivative assets $ 11,664 $ 69,105
Liabilities    
Derivative liabilities (Note 11) 97,066 29,321
Recurring    
Assets    
Derivative assets 11,664 69,105
Liabilities    
Derivative liabilities (Note 11) 97,066 29,321
Recurring | Level 1    
Assets    
Derivative assets 0 0
Liabilities    
Derivative liabilities (Note 11) 0 0
Recurring | Level 2    
Assets    
Derivative assets 11,664 69,105
Liabilities    
Derivative liabilities (Note 11) 97,066 29,321
Recurring | Level 3    
Assets    
Derivative assets 0 0
Liabilities    
Derivative liabilities (Note 11) $ 0 $ 0