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Supplemental Cash Flow Information (Tables)
 3 Months Ended
Mar. 31, 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:
 
 
Three Months Ended 
 March 31,
(in thousands)
 
2019
 
2018
 
 
 
 
 
Accounts receivable
 
$
4,031

 
$
9,166

Other current assets
 
(4,812
)
 
(3,508
)
Accounts payable
 
4,539

 
4,251

Accrued employee compensation and benefits
 
(22,399
)
 
(13,516
)
Other accrued liabilities
 
335

 
1,412

Unearned revenue
 
(3,339
)
 
(169
)
Other, net
 
(4,131
)
 
106

Total
 
$
(25,776
)
 
$
(2,258
)