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Property, plant and equipment | 12 Months Ended
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Dec. 31, 2017
Property Plant And Equipment [Abstract] |
Property, plant and equipment |
3. | Property, plant and equipment
Property, plant and equipment is stated at cost less accumulated depreciation. Costs include all expenditures necessary to place the asset in service, including freight and sales and use taxes. Property, plant and equipment includes instrumentation held by customers, which is generally used to facilitate the implantation of the Company’s products. The useful lives of these assets are as follows:
|  | Years
Buildings |  | 25 to 33
Plant and equipment |  | 1 to 10
Instrumentation |  | 3 to 4
Computer software |  | 3 to 7
Furniture and fixtures |  | 4 to 8
The Company evaluates the useful lives of these assets on an annual basis. Depreciation is computed on a straight-line basis over the useful lives of the assets. Depreciation of leasehold improvements is computed over the shorter of the lease term or the useful life of the asset. Total depreciation expense was $18.3 million, $19.0 million and $19.2 million for the years ended December 31, 2017, 2016 and 2015, respectively. Expenditures for maintenance and repairs and minor renewals and improvements, which do not extend the lives of the respective assets, are expensed as incurred. All other expenditures for renewals and improvements are capitalized. The assets and related accumulated depreciation are adjusted for property retirements and disposals, with the resulting gain or loss included in earnings. Fully depreciated assets remain in the accounts until retired from service.
|  | December 31, |
(U.S. Dollars, in thousands) |  | 2017 |  |  | 2016 |
Cost |  |  |  |  |  |  |  |
Buildings |  | $ | 3,725 |  |  | $ | 3,225 |
Plant and equipment |  |  | 47,588 |  |  |  | 43,745 |
Instrumentation |  |  | 75,818 |  |  |  | 71,962 |
Computer software |  |  | 48,604 |  |  |  | 44,720 |
Furniture and fixtures |  |  | 7,605 |  |  |  | 8,308 |
Construction in progress |  |  | 769 |  |  |  | 1,907 |
|  |  | 184,109 |  |  |  | 173,867 |
Accumulated depreciation |  |  | (138,970 | ) |  |  | (124,951 | )
Property, plant and equipment, net |  | $ | 45,139 |  |  | $ | 48,916 |
The Company capitalizes system development costs related to its internal use software during the application development stage. Costs related to preliminary project activities and post implementation activities are expensed as incurred. Internal-use software is amortized on a straight-line basis over its estimated useful life, generally three to seven years. Long-lived assets are evaluated for impairment whenever events or changes in circumstances have occurred that would indicate impairment. For purposes of the evaluation, the Company groups its long-lived assets with other assets and liabilities at the lowest level of identifiable cash flows if the asset does not generate cash flows independent of other assets and liabilities. If the carrying value of the asset (asset group) exceeds the undiscounted cash flows expected to result from the use and eventual disposition of the asset (asset group), the Company will write the carrying value down to the fair value in the period identified. The Company generally determines fair value of long-lived assets as the present value of estimated future cash flows. In determining the estimated future cash flows associated with the assets, the Company uses estimates and assumptions about future revenue contributions, cost structures and remaining useful lives of the asset (asset group). The use of alternative assumptions, including estimated cash flows, discount rates, and alternative estimated remaining useful lives could result in different calculations of impairment.

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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=64827811&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=64862545&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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