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Other Current Assets (Tables)
 12 Months Ended
Dec. 31, 2018
Other Assets [Abstract]  
Other Current Assets
Other current assets consist of the following at December 31, 2018 and 2017 (in thousands):
 
December 31,
 
2018
 
2017
Income tax receivables
$
40,116

 
$
47,130

Prepaid expenses
43,172

 
86,348

Other
1,502

 
2,586

Total
$
84,790

 
$
136,064