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Supplemental Cash Flow Information (Tables)
 12 Months Ended
Dec. 31, 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:
 
 
For the years ended December 31,
(in thousands)
 
2018
 
2017
 
2016
 
 
 
 
 
 
 
Accounts receivable
 
$
(22,130
)
 
$
(22,522
)
 
$
(20,511
)
Other current assets
 
(6,207
)
 
(6,150
)
 
(3,130
)
Accounts payable
 
965

 
(7,259
)
 
460

Accrued employee compensation and benefits
 
9,218

 
3,175

 
(1,056
)
Other accrued liabilities
 
(1,525
)
 
12,645

 
(6,100
)
Unearned revenue
 
2,915

 
943

 
(1,353
)
Other, net
 
605

 
(3,022
)
 
(1,956
)
Total
 
$
(16,159
)
 
$
(22,190
)
 
$
(33,646
)