Property and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Property and Equipment
Ships	$ 20,855,606	$ 19,958,127
Ship improvements	1,341,137	976,363
Ships under construction	169,274	227,123
Land, buildings and improvements, including leasehold improvements and port facilities	377,821	360,399
Computer hardware and software, transportation equipment and other	698,865	748,102
Total property and equipment	23,442,703	22,270,114
Less-accumulated depreciation and amortization	(5,991,669)	(5,335,297)
Property and equipment, net	$ 17,451,034	$ 16,934,817

The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

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Gross amount of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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- Definition

Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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