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Property and Equipment
 12 Months Ended
Dec. 31, 2024
Property, Plant and Equipment [Abstract]  
Property and Equipment Property and equipment
Property and equipment comprised the following:
 December 31,
 20242023
Land$50,172 $35,216 
Buildings428,994 436,460 
Leasehold improvements4,180,747 4,058,987 
Equipment and information systems, including internally developed software4,410,395 4,125,235 
New center and capital asset projects in progress133,311 177,149 
 9,203,619 8,833,047 
Less accumulated depreciation(6,262,703)(5,759,514)
 $2,940,916 $3,073,533 
Depreciation and amortization expenses are computed using the straight-line method over the useful lives of the assets estimated as follows: buildings, 25 years to 40 years; leasehold improvements, the shorter of ten years or the expected lease term; and equipment and information systems, including internally developed software, principally three years to 15 years. Depreciation expense on property and equipment was $716,396, $736,474 and $721,133 for 2024, 2023 and 2022, 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 $7,978, $9,178 and $12,677 for 2024, 2023 and 2022, respectively.