Property and equipment

6.	Property and equipment

Property and equipment were comprised of the following:


	December 31,
	2013			2012
Land	$	34,960		$	35,633
Buildings		157,998			148,881
Leasehold improvements		1,749,632			1,494,676
Equipment and information systems		1,832,221			1,577,976
New center and capital asset projects in progress		192,859			137,387

		3,967,670			3,394,553
Less accumulated depreciation		(1,778,259	)		(1,522,183	)

	$	2,189,411		$	1,872,370

Depreciation expense on property and equipment was $373,107, $299,810 and $247,966 for 2013, 2012 and 2011, respectively.

Interest on debt incurred during the development of new centers and other capital asset projects is capitalized as a component of the asset cost based on the respective in-process capital asset balances. Interest capitalized was $6,408, $8,126 and $4,887 for 2013, 2012 and 2011, respectively.

- Definition

The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures.

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