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Supplemental Cash Flow Information
9 Months Ended
Sep. 30, 2021
Supplemental Cash Flow Elements [Abstract]  
Supplemental Cash Flow Information Supplemental Cash Flow Information 
 Three Months EndedNine Months Ended
 September 30,
2021
September 30,
2020
September 30,
2021
September 30,
2020
Supplemental disclosures:(in thousands)
Income taxes paid$3,167 $1,841 $5,909 $11,576 
Non-cash investing and financing activities:  
Non-cash capital expenditures1
$(1,052)$(4,421)$(2,897)$625 
1 Includes non-cash changes in accrued capital expenditures