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Other Current Assets (Tables)
 12 Months Ended
Dec. 31, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Other Current Assets
Other current assets consisted of the following (in thousands):
 
 
 
December 31,
 
 
2017
 
2016
Deposits in trusts for employee deferred compensation plans
 
$
292,326

 
$
236,371

Other
 
112,385

 
84,434

Other current assets
 
$
404,711

 
$
320,805