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Long-term Debt
9 Months Ended
Sep. 30, 2018
Long-term Debt and Capital Lease Obligations [Abstract]  
Long-term Debt
Long-term Debt
(in thousands)
 
September 30,
2018
 
December 31,
2017
Senior notes - 4.10% due 2022 (net of related deferred financing costs)
 
$
347,530

 
$
347,091

Senior notes - 3.78% due 2029
 
250,000

 
250,000

Revolving credit facility
 
215,619

 
0

Capital lease obligations
 
5,328

 
5,809

 
 
$
818,477

 
$
602,900


The outstanding 4.10% senior notes have an aggregate principal amount of $350 million and are registered under the Securities Act of 1933, as amended (Securities Act). The outstanding 3.78% senior notes are unsecured and were issued in a 2017 private placement with The Prudential Insurance Company of America and certain other purchasers. We were in compliance with all covenants under both issuances of the senior notes as of September 30, 2018 and December 31, 2017.
The revolving credit facility has a term of five years and matures on September 22, 2022. The obligations under the revolving agreement are unsecured and are fully and unconditionally guaranteed by NewMarket. The average interest rate for borrowings under our revolving credit facility was 3.0% during the first nine months of 2018 and 2.5% during the full year of 2017. We were in compliance with all covenants under the revolving credit facility as of September 30, 2018 and December 31, 2017.
The following table provides information related to the unused portion of our revolving credit facility:
(in thousands)
 
September 30,
2018
 
December 31,
2017
Maximum borrowing capacity under the revolving credit facility
 
$
850,000

 
$
850,000

Outstanding borrowings under the revolving credit facility
 
215,619

 
0

Outstanding letters of credit
 
2,710

 
2,830

Unused portion of revolving credit facility
 
$
631,671

 
$
847,170


The capital lease obligations are related to the Singapore manufacturing facility.