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Senior Notes (Notes) | 9 Months Ended
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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, 2019 |  | September 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,
| 2019 |  | 2020 |  | 2019 |  | 2020
Senior Notes interest expense | $ | 5,383 |  |  | $ | 6,625 |  |  | $ | 16,148 |  |  | $ | 19,875 |
Senior Notes amortization of debt discount | 124 |  |  | 133 |  |  | 367 |  |  | 393 |
Senior Notes amortization of debt premium | — |  |  | 56 |  |  | — |  |  | 165 |
Senior Notes amortization of debt issuance costs | 35 |  |  | 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.

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- Definition The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -URI http://asc.fasb.org/topic&trid=2208564 + Details
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