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Property, Plant and Equipment | 12 Months Ended
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Dec. 31, 2015
Property, Plant and Equipment | E. PROPERTY, PLANT AND EQUIPMENT Property, plant and equipment consist of the following:
|  | 2015 |  |  | 2014 |
|  | (in thousands) |
Land |  | $ | 16,561 |  |  | $ | 16,561 |
Buildings |  |  | 108,797 |  |  |  | 108,671 |
Machinery and equipment |  |  | 595,445 |  |  |  | 659,743 |
Furniture and fixtures, and software |  |  | 82,612 |  |  |  | 77,566 |
Leasehold improvements |  |  | 43,328 |  |  |  | 31,981 |
Construction in progress |  |  | 2,630 |  |  |  | 2,508 |
|  |  | 849,373 |  |  |  | 897,030 |
Less: accumulated depreciation |  |  | 575,959 |  |  |  | 567,992 |
|  | $ | 273,414 |  |  | $ | 329,038 |
Depreciation of property, plant and equipment for the years ended December 31, 2015, 2014 and 2013 was $68.2 million, $73.4 million and $57.3 million, respectively. As of December 31, 2015 and 2014, the gross book value included in machinery and equipment for internally manufactured test systems being leased by customers was $20.4 million and $89.6 million, respectively. As of December 31, 2015 and 2014, the accumulated depreciation on these test systems was $8.5 million and $19.9 million, respectively.

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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=51717284&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=51719941&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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