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Property, Plant and Equipment | 12 Months Ended
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Dec. 31, 2018
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment | Property, Plant and Equipment Property, plant and equipment consist of the following at December 31:
| 2018 |  | 2017
Land | $ | 4,027 |  |  | $ | 4,027 |
Building and improvements | 92,470 |  |  | 91,766 |
Machinery and equipment | 227,795 |  |  | 219,675 |
Construction in progress | 8,043 |  |  | 7,837 |
| 332,335 |  |  | 323,305 |
Less: Accumulated depreciation | (219,090 | ) |  | (207,076 | )
| $ | 113,245 |  |  | $ | 116,229 |
Internal-use software, included in gross machinery and equipment at December 31, 2018 and 2017 was $47.8 million and $45.3 million, respectively, with related accumulated depreciation of $34.5 million and $30.4 million, respectively. Internal use software depreciation expense was $4.7 million, $4.5 million and $4.0 million for the years ended December 31, 2018, 2017 and 2016, respectively. We lease various manufacturing facilities, office facilities and equipment under operating and capital leases. Leasehold improvements related to these facilities are included in building and improvements above. Rental expense on operating leases was approximately $8.7 million, $6.5 million and $6.0 million for the years ended December 31, 2018, 2017 and 2016, respectively. During 2018 and 2017, we entered into capital lease obligations of $0.2 million and $0.8 million in connection with the purchase of equipment. The aggregate future minimum lease commitments for leases at December 31, 2018 are as follows:
| Operating Leases | Capital Leases
2019 | $ | 8,759 |  | $ | 347 |
2020 | 5,520 |  | 217 |
2021 | 2,929 |  | 21 |
2022 | 2,406 |  | 75 |
2023 | 1,563 |  | — |
Thereafter | 1,497 |  | — |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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