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Supplemental Cash Flow Information (Tables)
 6 Months Ended
Jun. 30, 2019
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)
 
2019
 
2018
 
 
 
 
 
Accounts receivable
 
$
(12,417
)
 
$
(5,363
)
Other current assets
 
3,201

 
(5,040
)
Accounts payable
 
15,054

 
8,836

Accrued employee compensation and benefits
 
(10,614
)
 
(4,812
)
Other accrued liabilities
 
(2,767
)
 
(4,484
)
Unearned revenue
 
(4,937
)
 
191

Other, net
 
(14,593
)
 
597

Total
 
$
(27,073
)
 
$
(10,075
)