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Senior Notes (Notes)
 9 Months Ended
Sep. 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 September 30, 2020 is reflected on our Consolidated Balance Sheet as follows (in thousands):
December 31, 2019September 30, 2020
Long-term liabilities:
Principal amount$400,000 $400,000 
Debt premium, net of accumulated amortization of $0 and $165, respectively
1,688 1,523 
Debt discount, net of accumulated amortization of $765 and $1,158, respectively
(4,110)(3,717)
Debt issuance costs, net of accumulated amortization of $216 and $424, respectively
(2,131)(1,990)
Carrying value of the Senior Notes$395,447 $395,816 
The fair value of the Senior Notes, which are Level 2 measurements, was $422.3 million at September 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 nine months ended September 30, 2019 and 2020 are as follows (in thousands):
Three months ended September 30,Nine months ended September 30,
2019202020192020
Senior Notes interest expense$5,383 $6,625 $16,148 $19,875 
Senior Notes amortization of debt discount124 133 367 393 
Senior Notes amortization of debt premium— 56 — 165 
Senior Notes amortization of debt issuance costs35 72 103 208 
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 68 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 nine months ended September 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 nine months ended September 30, 2020 was 6.20% and 6.90%, respectively.