Annual report pursuant to Section 13 and 15(d)

Revenue and Expense from Contracts with Customers (Details 1)

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Revenue and Expense from Contracts with Customers (Details 1) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Changes in operating assets and liabilities:      
Prepaid expenses and other assets $ (29,519) $ (22,714) $ (13,363)
Advance ticket sales 262,603 154,012 134,971
Net cash provided by operating activities 2,075,171 $ 1,601,247 $ 1,264,087
Adjustments | FASB ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606) ("Topic 606")      
Changes in operating assets and liabilities:      
Prepaid expenses and other assets 12,029    
Advance ticket sales (12,029)    
Net cash provided by operating activities 0    
Balances Without Adoption of Topic 606      
Changes in operating assets and liabilities:      
Prepaid expenses and other assets (17,490)    
Advance ticket sales 250,574    
Net cash provided by operating activities $ 2,075,171