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Supplemental Cash Flow Information (Tables)
6 Months Ended
Jun. 30, 2021
Supplemental Cash Flow Elements [Abstract]  
Change in certain working capital accounts
The following table presents additional information about the change in certain working capital accounts:
Six Months Ended 
June 30,
(in thousands)20212020
Accounts receivable$15,223 $41,231 
Other current assets(19,155)(8,435)
Accounts payable12,591 19,083 
Accrued employee compensation and benefits(11,392)(6,575)
Accrued interest19,404 896 
Other accrued liabilities(15,379)(7,533)
Unearned revenue(4,187)(1,333)
Other, net(134)406 
Total$(3,029)$37,740