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Property, Plant and Equipment
 6 Months Ended
Jun. 30, 2021
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
12. Property, Plant and Equipment:
A summary of property, plant and equipment, at cost, and related accumulated depreciation is as follows:
June 30,
2021		December 31,
2020
Land
$97,712 $93,650 
Buildings
77,695 76,010 
Machinery and equipment
688,774 656,502 
Construction in progress
39,568 42,446 
903,749 868,608 
Less: accumulated depreciation
(308,726)(276,898)
$595,023 $591,710 
Depreciation expense was $17,529 and $16,340 for the three months ended June 30, 2021 and 2020, respectively. Depreciation expense was $33,533 and $31,635 for the six months ended June 30, 2021 and 2020, respectively.