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

Income taxes (Net deferred tax (liabilities) assets) (Details)

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Income taxes (Net deferred tax (liabilities) assets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Line Items]      
Deferred tax liabilities, depreciation/impairment $ (1,919,478) $ (1,607,193)  
Deferred tax liabilities, intangibles (9,816) (13,119)  
Deferred tax liabilities, accrued maintenance liability (1,790)    
Deferred tax assets, accrued maintenance liability   1,267  
Deferred tax liabilities, obligations under capital leases and debt obligations (3,806) (4,255)  
Deferred tax liabilities, investments (7,996) (8,619)  
Deferred tax assets, deferred losses on sale of assets 24,178 28,770  
Valuation allowance (74,361) (92,298) $ (104,858)
Deferred tax assets, losses and credits forward 1,244,191 1,110,815  
Deferred tax liabilities, other (66,381) (81,685)  
Net deferred income tax (liabilities) (815,259) (666,317)  
Ireland      
Income Tax Disclosure [Line Items]      
Deferred tax liabilities, depreciation/impairment (1,924,492) (1,612,534)  
Deferred tax liabilities, intangibles (4,594) (7,011)  
Deferred tax liabilities, accrued maintenance liability (3,456) (3,242)  
Deferred tax liabilities, obligations under capital leases and debt obligations (3,806) (4,255)  
Valuation allowance (5,654) (3,296)  
Deferred tax assets, losses and credits forward 1,146,434 996,676  
Deferred tax liabilities, other (58,691) (77,973)  
Net deferred income tax (liabilities) (854,259) (711,635)  
United States      
Income Tax Disclosure [Line Items]      
Deferred tax liabilities, depreciation/impairment (606)    
Deferred tax assets, depreciation and impairment   254  
Deferred tax liabilities, intangibles (5,222) (6,108)  
Deferred tax assets, accrued maintenance liability 1,666 4,509  
Deferred tax liabilities, investments (7,996) (8,619)  
Deferred tax assets, deferred losses on sale of assets 24,178 28,770  
Valuation allowance (38,720) (57,145)  
Deferred tax assets, losses and credits forward 58,099 62,351  
Deferred tax liabilities, other (99)    
Deferred tax asset, other   502  
Net deferred income tax assets 31,300 24,514  
The Netherlands      
Income Tax Disclosure [Line Items]      
Deferred tax assets, depreciation and impairment 6,873 5,974  
Valuation allowance (16,025) (15,938)  
Deferred tax assets, losses and credits forward 20,568 28,770  
Deferred tax liabilities, other (1,773) (1,760)  
Net deferred income tax assets 9,643 17,046  
Other      
Income Tax Disclosure [Line Items]      
Deferred tax liabilities, depreciation/impairment (1,253) (887)  
Valuation allowance (13,962) (15,919)  
Deferred tax assets, losses and credits forward 19,090 23,018  
Deferred tax liabilities, other (5,818) (2,454)  
Net deferred income tax (liabilities) $ (1,943)    
Net deferred income tax assets   $ 3,758