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Senior Notes (Notes)
6 Months Ended
Jun. 30, 2020
Debt Disclosure [Abstract]  
Debt Disclosure [Text Block] SENIOR NOTES
The carrying value of our 6.625% Senior Notes due 2026 (the “Senior Notes”) at December 31, 2019 and June 30, 2020 is reflected on our Consolidated Balance Sheet as follows (in thousands):
 
December 31, 2019

 
June 30, 2020

Long-term liabilities:
 
 
 
Principal amount
$
400,000

 
$
400,000

Debt premium, net of accumulated amortization of $0 and $109, respectively
1,688

 
1,579

Debt discount, net of accumulated amortization of $765 and $1,025, respectively
(4,110
)
 
(3,850
)
Debt issuance costs, net of accumulated amortization of $216 and $352, respectively
(2,131
)
 
(2,061
)
Carrying value of the Senior Notes
$
395,447

 
$
395,668

The fair value of the Senior Notes, which are Level 2 measurements, was $419.9 million at June 30, 2020. The Senior Notes are due on June 1, 2026 and bear interest at 6.625% per year which is payable semi-annually in arrears on June 1 and December 1 of each year.
The interest expense and amortization of debt discount, debt premium and debt issuance costs related to our Senior Notes during the three and six months ended June 30, 2019 and 2020 is as follows (in thousands):
 
Three months ended June 30,
 
Six months ended June 30,
 
2019

 
2020

 
2019

 
2020

Senior Notes interest expense
$
5,383

 
$
6,625

 
$
10,766

 
$
13,250

Senior Notes amortization of debt discount
122

 
131

 
242

 
260

Senior Notes amortization of debt premium

 
55

 

 
109

Senior Notes amortization of debt issuance costs
34

 
69

 
68

 
136


The debt discount, the debt premium and the debt issuance costs are being amortized using the effective interest method over the remaining term of approximately 71 months of the Senior Notes. The effective interest rate on the unamortized debt discount and the unamortized debt issuance costs for the initial Senior Notes, which were issued in May 2018, for both the three and six months ended June 30, 2020 was 6.87% and 6.69%, respectively. The effective interest rate on the unamortized debt premium and the unamortized debt issuance costs for the additional Senior Notes, which were issued in December 2019, for both the three and six months ended June 30, 2020 was 6.20% and 6.90%, respectively.