Land and land improvements

$

54,005

$

51,881

$

52,339

Buildings and improvements

240,849

238,380

238,709

Machinery and equipment

524,535

502,553

502,223

Office equipment, furniture, vehicles and computer software

16,239

15,555

15,604

Construction in progress

14,944

12,844

16,177

Property, plant and equipment, cost

850,572

821,213

825,052

Less: accumulated depreciation

(528,938

)

(496,908

)

(500,284

)

Property, plant and equipment, net

$

321,634

$

324,305

$

324,768