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Property, Plant and Equipment, Net (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020 | Jun. 30, 2020
--- | --- | --- | ---
Property, Plant and Equipment |  |  |
Property, plant and equipment, gross | $ 629,767 | $ 611,988 | $ 594,087
Less accumulated depreciation and amortization | (393,653) | (377,460) | (360,719)
Property, plant and equipment excluding capital projects in progress, net | 236,114 | 234,528 | 233,368
Capital projects in progress | 19,239 | 20,656 | 13,751
Property, plant and equipment, net | 255,353 | 255,184 | 247,119
Land |  |  |
Property, Plant and Equipment |  |  |
Property, plant and equipment, gross | 28,373 | 28,553 | 28,068
Buildings and site improvements |  |  |
Property, Plant and Equipment |  |  |
Property, plant and equipment, gross | 202,573 | 203,421 | 200,205
Leasehold improvements |  |  |
Property, Plant and Equipment |  |  |
Property, plant and equipment, gross | 5,961 | 7,091 | 5,817
Machinery, equipment, and software |  |  |
Property, Plant and Equipment |  |  |
Property, plant and equipment, gross | $ 392,860 | $ 372,923 | $ 359,997

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