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Property, Plant and Equipment (Tables) | 3 Months Ended
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Mar. 31, 2018
Property, Plant and Equipment [Abstract] |
Property, plant and equipment | Property, plant and equipment consist of the following:
In thousands | March 31, 2018 |  | December 31, 2017
Land | $ | 9,107 |  |  | $ | 9,408 |
Facilities and equipment | 559,276 |  |  | 554,160 |
Assets under capital leases | 88,720 |  |  | 82,753 |
| 657,103 |  |  | 646,321 |
Accumulated amortization (1) | (456,374 | ) |  | (448,001 | )
| 200,729 |  |  | 198,320 |
Construction in progress | 65,428 |  |  | 56,417 |
Property, plant and equipment, net | $ | 266,157 |  |  | $ | 254,737 |
(1) Includes $29.0 million and $28.2 million of accumulated amortization related to assets under capital leases at March 31, 2018 and December 31, 2017, respectively.

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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://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 Reference 2: 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)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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