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

Fair value measurements (Carrying amounts and fair values of financial instruments) (Details)

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Fair value measurements (Carrying amounts and fair values of financial instruments) (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
Carrying value    
Assets    
Cash and cash equivalents 1,121,396 1,204,018
Restricted cash 178,951 211,017
Derivative assets 11,664 69,105
Assets, Carrying value 1,312,011 1,484,140
Liabilities    
Debt 29,624,266 29,668,203
Derivative liabilities (Note 11) 97,066 29,321
Liabilities, Carrying value 29,721,332 29,697,524
Fair value    
Assets    
Cash and cash equivalents 1,121,396 1,204,018
Restricted cash 178,951 211,017
Derivative assets 11,664 69,105
Assets, Carrying value 1,312,011 1,484,140
Liabilities    
Debt 30,219,588 29,031,153
Derivative liabilities (Note 11) 97,066 29,321
Liabilities, Carrying value 30,316,654 29,060,474
Fair value | Level 1    
Assets    
Cash and cash equivalents 1,121,396 1,204,018
Restricted cash 178,951 211,017
Derivative assets 0 0
Assets, Carrying value 1,300,347 1,415,035
Liabilities    
Debt 0 0
Derivative liabilities (Note 11) 0 0
Liabilities, Carrying value 0 0
Fair value | Level 2    
Assets    
Cash and cash equivalents 0 0
Restricted cash 0 0
Derivative assets 11,664 69,105
Assets, Carrying value 11,664 69,105
Liabilities    
Debt 30,219,588 29,031,153
Derivative liabilities (Note 11) 97,066 29,321
Liabilities, Carrying value 30,316,654 29,060,474
Fair value | Level 3    
Assets    
Cash and cash equivalents 0 0
Restricted cash 0 0
Derivative assets 0 0
Assets, Carrying value 0 0
Liabilities    
Debt 0 0
Derivative liabilities (Note 11) 0 0
Liabilities, Carrying value $ 0 $ 0