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Property and Equipment, Net (Tables) | 12 Months Ended
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Dec. 31, 2018
Property, Plant and Equipment [Abstract] |
Schedule of Estimated Useful Lives for Property and Equipment | We provide for depreciation and amortization primarily using the straight-line method by charges to the consolidated statements of income in amounts that allocate the cost of property and equipment over their estimated useful lives as follows:
Asset Classification |  | Estimated Useful Life
﻿ |  |
Land improvements |  | 15 to 20 years
Buildings and improvements |  | 10 to 40 years
Leasehold improvements |  | Shorter of remaining lease term or useful life of improvements
Machinery and equipment |  | 3 to 8 years
Office furniture and equipment |  | 3 to 7 years
Computer hardware and software |  | 3 to 7 years
Schedule of Property and Equipment | Property and equipment, net, consisted of the following (in thousands):
﻿ |  | December 31, 2018 |  | December 31, 2017
﻿ |  |  |  |  |  |
Land and improvements |  | $ | 8,701 |  |  | $ | 7,323 |
Buildings and improvements |  | 190,809 |  |  | 180,185 |
Leasehold improvements |  | 66,917 |  |  | 52,227 |
Machinery and equipment |  | 299,204 |  |  | 284,375 |
Office furniture and equipment |  | 51,661 |  |  | 47,476 |
Computer hardware and software |  | 218,150 |  |  | 206,580 |
Construction in progress |  | 70,561 |  |  | 33,470 |
﻿ |  | 906,003 |  |  | 811,636 |
Less accumulated depreciation and amortization |  | 468,733 |  |  | 432,540 |
Total property and equipment, net |  | $ | 437,270 |  |  | $ | 379,096 |
Summary of Depreciation and Amortization, Capitalized Computer Software for Internal Use and Unpaid Property Equipment Reflected in Accounts Payable and Accrued Expenses | Below are the amounts of depreciation and amortization of property and equipment, capitalized computer software for internal use, unpaid property and equipment reflected in account payable and accrued expenses, and rental and reagent rental program instruments transferred from inventory to property and equipment:
﻿ |  | December 31, 2018 |  | December 31, 2017 |  | December 31, 2016
﻿ |  |  |  |  |  |  |  |  |
Depreciation and amortization expense |  | $ | 74,208 |  |  | $ | 73,797 |  |  | $ | 63,537 |
Capitalized computer software developed for internal use |  | $ | 17,115 |  |  | $ | 16,131 |  |  | $ | 15,590 |
Unpaid property and equipment, reflected in accounts payable and accrued liabilities |  | $ | 17,894 |  |  | $ | 11,744 |  |  | $ | 10,601 |
Rental and Reagent Rental Program instruments transferred from inventory to property and equipment (Note 3) |  | $ | 20,360 |  |  | $ | 16,313 |  |  | $ | 18,324 |

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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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