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Supplemental Cash Flow Information
12 Months Ended
Dec. 31, 2020
Supplemental Cash Flow Information [Abstract]  
Supplemental Cash Flow Information Supplemental Cash Flow Information
 Years Ended December 31,
(in thousands)
202020192018
Cash paid during the year for
Interest and financing expenses (net of capitalization)$26,148 $28,523 $28,915 
Income taxes62,238 64,899 76,859 
Supplemental disclosure of non-cash transactions:
Non-cash additions to property, plant, and equipment$5,106 $6,025 $3,076