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Supplemental Cash Flow Information
 6 Months Ended
Jun. 30, 2020
Supplemental Cash Flow Elements [Abstract]  
Supplemental Cash Flow Information Supplemental Cash Flow Information
 
 Three Months EndedSix Months Ended
 June 30,
2020		June 30,
2019		June 30,
2020		June 30,
2019
Supplemental disclosures:(in thousands)
Income taxes paid$6,711  $41  $9,735  $394  
Non-cash investing and financing activities:  
Non-cash capital expenditures$6,046  $(1,232) $5,046  $(164) 
Dividends declared9,930  $8,355  $9,930  $8,355