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

Income Taxes (Deferred Tax Assets And Liabilities) (Details)

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Income Taxes (Deferred Tax Assets And Liabilities) (Details) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Line Items]      
Depreciation/Impairment $ (858,283,000) $ (637,997,000)  
Debt   1,326,000  
Intangibles (28,834,000) (37,033,000)  
Interest expense (5,435,000) 6,008,000  
Accrued maintenance liability 4,877,000 12,143,000  
Obligations under capital leases and debt obligations (3,411,000) (3,725,000)  
Investments (10,155,000) (2,946,000)  
Deferred losses 66,543,000 49,787,000  
Accrued expenses 14,554,000 26,532,000  
Valuation allowance (72,000,000) (61,933,000)
Losses and credits forward 715,841,000 562,292,000  
Other (27,884,000) (8,288,000)  
Net deferred tax asset (liabilities) (204,187,000) (93,834,000)  
The Netherlands [Member]      
Income Tax Disclosure [Line Items]      
Depreciation/Impairment 11,580,000 12,479,000  
Valuation allowance (13,915,000)    
Losses and credits forward 13,915,000    
Other (2,936,000) 3,210,000  
Net deferred tax asset (liabilities) 8,644,000 15,689,000  
Ireland [Member]      
Income Tax Disclosure [Line Items]      
Depreciation/Impairment (876,219,000) (618,323,000)  
Debt   (355,000)  
Intangibles (10,071,000) (73,000)  
Accrued maintenance liability (7,003,000) (7,673,000)  
Obligations under capital leases and debt obligations (3,411,000) (3,725,000)  
Investments   2,500,000  
Valuation allowance 0    
Losses and credits forward 630,302,000 514,757,000  
Other (20,647,000) (1,127,000)  
Net deferred tax asset (liabilities) (287,049,000) (114,019,000)  
United States Of America [Member]      
Income Tax Disclosure [Line Items]      
Depreciation/Impairment 5,393,000 (28,964,000)  
Debt   1,681,000  
Intangibles (18,763,000) (36,960,000)  
Interest expense (5,435,000) 6,008,000  
Accrued maintenance liability 11,880,000 19,816,000  
Investments (10,155,000) (5,446,000)  
Deferred losses 66,543,000 49,787,000  
Accrued expenses 14,554,000 26,532,000  
Valuation allowance (35,074,000) (25,000,000)  
Losses and credits forward 32,342,000 3,586,000  
Other 7,350,000 2,870,000  
Net deferred tax asset (liabilities) 68,635,000 13,910,000  
Other [Member]      
Income Tax Disclosure [Line Items]      
Depreciation/Impairment 963,000 (3,189,000)  
Valuation allowance (23,011,000) (36,933,000)  
Losses and credits forward 39,282,000 43,949,000  
Other (11,651,000) (13,241,000)  
Net deferred tax asset (liabilities) $ 5,583,000 $ (9,414,000)