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Supplemental Cash Flow Information (Tables)
 6 Months Ended
Jun. 30, 2018
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)
 
2018
 
2017
 
 
 
 
 
Accounts receivable
 
$
(5,363
)
 
$
(9,086
)
Other current assets
 
(5,040
)
 
(8,939
)
Accounts payable
 
8,836

 
(3,905
)
Accrued employee compensation and benefits
 
(4,812
)
 
(3,406
)
Other accrued liabilities
 
(4,484
)
 
6,764

Other, net
 
788

 
(1,575
)
Total
 
$
(10,075
)
 
$
(20,147
)