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Other Current Assets
 12 Months Ended
Dec. 31, 2017
Other Assets [Abstract]  
Other Current Assets
Other Current Assets:
Other current assets consist of the following at December 31, 2017 and 2016 (in thousands):
 
December 31,
 
2017
 
2016
Income tax receivables
$
47,130

 
$
15,085

Prepaid expenses
86,348

 
42,240

Other
2,586

 
1,254

Total
$
136,064

 
$
58,579