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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 | 5 Property, Plant and Equipment Property, plant and equipment consist of the following (in thousands):
|  |  | December 31,
|  |  | 2017 |  | 2016
Land and land improvements |  | $ | 37,525 |  | $ | 35,720
Buildings and leasehold improvements |  |  | 294,219 |  |  | 274,021
Production and other equipment |  |  | 484,475 |  |  | 438,604
Construction in progress |  |  | 22,140 |  |  | 20,204
| Total property, plant and equipment |  |  | 838,359 |  |  | 768,549
Less: accumulated depreciation and amortization |  |  | (489,081) |  |  | (431,431)
| Property, plant and equipment, net |  | $ | 349,278 |  | $ | 337,118
During 2017, 2016 and 2015, the Company retired and disposed of approximately $15 million, $15 million and $29 million of property, plant and equipment, respectively, most of which was fully depreciated and no longer in use. Gains on disposal were immaterial for the years ended December 31, 2017 and 2016. In February 2018, the Company’s Board of Directors approv ed expanding its chemistry synthesis operations. The Company anticipates spending an estimated $215 million to build and equip this new state-of-the-art manufacturing facility, which will be paid for with existing cash and investme nts. The Company does not expect to issue any debt in relation to this expansion.

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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 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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