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Commercial Paper (Tables)
 12 Months Ended
Dec. 31, 2017
Debt Disclosure [Abstract]  
Schedule of information regarding commercial paper program
The following table provides information regarding the Company’s commercial paper program:
 
 
December 31,
 
 
2017
 
2016
Face value
 
$
99,886

 
$
99,049

Carrying value
 
$
99,886

 
$
99,049

Effective interest rate
 
1.4%-1.7%
 
0.7%-0.8%
Maturity range (days)
 
19 - 67
 
10 - 30