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PROPERTY, PLANT AND EQUIPMENT | 12 Months Ended
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Dec. 31, 2016
Property, Plant and Equipment [Abstract] |
PROPERTY, PLANT AND EQUIPMENT | PROPERTY, PLANT AND EQUIPMENT Property, plant and equipment consisted of the following at December 31, (in thousands):
| Estimated Useful Life |  | 2016 |  | 2015
| (in Years) |  |  |  |
Land | - |  | $ | 10,463 |  |  | $ | 10,463 |
Buildings | 25 |  | 65,894 |  |  | 64,154 |
Machinery and equipment | 3 to 25 |  | 238,029 |  |  | 223,521 |
Furniture and fixtures | 3 to 5 |  | 5,570 |  |  | 5,354 |
Transportation equipment | 3 to 5 |  | 3,814 |  |  | 3,481 |
Improvements | 15 |  | 128,437 |  |  | 127,727 |
Construction in progress | - |  | 5,303 |  |  | 2,488 |
Total cost |  |  | 457,510 |  |  | 437,188 |
Less accumulated depreciation |  |  | 251,288 |  |  | 236,804 |
Net book value |  |  | $ | 206,222 |  |  | $ | 200,384 |
We lease certain equipment used in the normal course under month-to-month lease agreements cancelable only by us. During 2016, 2015, and 2014, we expensed $2.5 million, $5.9 million, and $5.6 million, respectively, related to these leases. We lease our corporate office and parking facilities located in Houston, Texas. Leased premises consist of office space of approximately 8,000 square feet. The term of the lease matures on January 31, 2020. We also lease and/or sublease facilities in Lake Charles, Jennings and Houma, Louisiana. See note 2 "LEEVAC Transaction" for additional description of these leases. The schedule of minimum rental payments under our leases/sublease is as follows (in thousands):
| Minimum Payments
2017 | $ | 852 |
2018 | 439 |
2019 | 325 |
2020 | 115 |
2021 | 96 |
Thereafter | 295 |
Total | $ | 2,122 |

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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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