Property and Equipment (Details) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Property and Equipment
Property and equipment, at cost	$ 3,153,041,000	$ 3,131,175,000
Less: accumulated depreciation	(546,390,000)	(519,721,000)
Property and equipment, net	2,606,651,000	2,611,454,000
Other Accrued Liabilities	10,900,000	3,000,000
Land [Member]
Property and Equipment
Property and equipment, at cost	402,198,000	402,198,000
Land improvements [Member]
Property and Equipment
Property and equipment, at cost	7,994,000	7,994,000
Buildings [Member]
Property and Equipment
Property and equipment, at cost	2,362,079,000	2,360,648,000
Furniture, fixtures, and equipment [Member]
Property and Equipment
Property and equipment, at cost	344,265,000	340,462,000
CIP and corporate office equipment [Member]
Property and Equipment
Property and equipment, at cost	$ 36,505,000	$ 19,873,000

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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