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Property, Plant and Equipment, Net (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018 | Jun. 30, 2018
--- | --- | --- | ---
Property, Plant and Equipment |  |  |
Property, plant and equipment, gross | $ 572,373 | $ 563,745 | $ 566,849
Less accumulated depreciation and amortization | (334,293) | (318,388) | (313,088)
Property, plant and equipment excluding capital projects in progress, net | 238,080 | 245,357 | 253,761
Capital projects in progress | 14,630 | 9,240 | 15,366
Property, plant and equipment, net | 252,710 | 254,597 | 269,127
Land |  |  |
Property, Plant and Equipment |  |  |
Property, plant and equipment, gross | 29,343 | 30,034 | 32,121
Buildings and site improvements |  |  |
Property, Plant and Equipment |  |  |
Property, plant and equipment, gross | 198,129 | 198,809 | 209,888
Leasehold improvements |  |  |
Property, Plant and Equipment |  |  |
Property, plant and equipment, gross | 5,016 | 4,826 | 4,709
Machinery, equipment, and software |  |  |
Property, Plant and Equipment |  |  |
Property, plant and equipment, gross | $ 339,885 | $ 330,076 | $ 320,131

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