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Property and Equipment (Schedule of Property and Equipment) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Abstract]    
Ships $ 28,348,088 $ 27,209,553
Ship improvements 3,920,800 2,965,634
Ships under construction 1,110,962 817,800
Land, buildings and improvements, including leasehold improvements and port facilities 472,067 321,136
Computer hardware and software, transportation equipment and other 1,698,007 1,120,988
Total property and equipment 35,549,924 32,435,111
Less-accumulated depreciation and amortization (10,083,116) (8,968,948)
Property and equipment, net $ 25,466,808 $ 23,466,163