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Property and equipment | 12 Months Ended
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Dec. 31, 2015
Property Plant And Equipment [Abstract] |
Property and equipment |
6. | Property and equipment
Property and equipment were comprised of the following:
|  | December 31, |
|  | 2015 |  |  | 2014 |
Land |  | $ | 42,080 |  |  | $ | 35,885 |
Buildings |  |  | 437,283 |  |  |  | 387,621 |
Leasehold improvements |  |  | 2,289,425 |  |  |  | 2,002,735 |
Equipment and information systems, including internally developed software |  |  | 2,080,446 |  |  |  | 1,836,704 |
New center and capital asset projects in progress |  |  | 336,513 |  |  |  | 235,660 |
|  |  | 5,185,747 |  |  |  | 4,498,605 |
Less accumulated depreciation |  |  | (2,397,007 | ) |  |  | (2,029,506 | )
|  | $ | 2,788,740 |  |  | $ | 2,469,099 |
Depreciation expense on property and equipment was $475,484, $428,309 and $373,107 for 2015, 2014 and 2013, 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 $9,723, $7,888 and $6,408 for 2015, 2014 and 2013, respectively.

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- 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13-14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=51717284&loc=d3e1361-107760 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=51719941&loc=d3e2921-110230 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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