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Supplemental Cash Flow Information
6 Months Ended
Jun. 30, 2021
Supplemental Cash Flow Elements [Abstract]  
Supplemental Cash Flow Information Supplemental Cash Flow Information 
 Three Months EndedSix Months Ended
 June 30,
2021
June 30,
2020
June 30,
2021
June 30,
2020
Supplemental disclosures:(in thousands)
Income taxes paid$2,529 $6,711 $2,742 $9,735 
Non-cash investing and financing activities:  
Non-cash capital expenditures1
$(2,109)$6,046 $(1,845)$5,046 
Dividends declared9,970 $9,930 $9,970 $9,930 
1 Includes non-cash changes in accrued capital expenditures