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Senior Notes (Notes) | 6 Months Ended
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Jun. 30, 2019
Debt Disclosure [Abstract] |
Debt Disclosure [Text Block] | SENIOR NOTES On May 31, 2018, we completed the issuance of $325.0 million in aggregate principal amount of our Senior Notes and related guarantees in a private offering under Rule 144A and Regulation S of the Securities Act. We received proceeds of $320.1 million, net of a 1.5% debt discount of $4.9 million, of which we used $291.4 million to repay our existing indebtedness under our Former Credit Agreement. We incurred approximately $1.4 million in transaction costs related to the Senior Notes. See Note 10 to the Consolidated Financial Statements included herein for further discussion of the repayment of our Former Credit Agreement. The Senior Notes bear interest at 6.625% per year. Interest on the Senior Notes began to accrue on May 31, 2018 and is payable semi-annually in arrears on June 1 and December 1 of each year, beginning on December 1, 2018 to holders of record on each May 15 and November 15 preceding an interest payment date. The Senior Notes mature on June 1, 2026, unless earlier redeemed or purchased. The Senior Notes are unsecured, senior obligations and are fully and unconditionally guaranteed on a senior unsecured basis, jointly and severally, by certain of our existing subsidiaries. The debt discount of $4.9 million and the debt issuance costs of $1.4 million are being amortized using the effective interest method over the remaining term of approximately 83 months of the Senior Notes. The effective interest rate on the unamortized debt discount for both the three and six months ended June 30, 2018 and 2019 was 6.87%. The effective interest rate on the unamortized debt issuance costs for both the three and six months ended June 30, 2018 and 2019 was 6.69%. The carrying value of the Senior Notes at December 31, 2018 and June 30, 2019 is reflected on our Consolidated Balance Sheet as follows (in thousands):
| December 31, 2018 |  | June 30, 2019
Long-term liabilities: |  |  |
Principal amount | $ | 325,000 |  |  | $ | 325,000 |
Debt discount, net of accumulated amortization of $273 and $515, respectively | (4,602 | ) |  | (4,360 | )
Debt issuance costs, net of accumulated amortization of $77 and $145, respectively | (1,290 | ) |  | (1,222 | )
Carrying value of the Senior Notes | $ | 319,108 |  |  | $ | 319,418 |
The fair value of the Senior Notes, which are Level 2 measurements, was approximately $334.8 million at June 30, 2019. Interest expense on the Senior Notes included contractual coupon interest expense of $1.9 million and $5.4 million for the three months ended June 30, 2018 and 2019, respectively and $1.9 million and $10.8 million for the six months ended June 30, 2018 and 2019, respectively. Amortization of the debt discount on the Senior Notes was approximately $38,000 and $122,000 for the three months ended June 30, 2018 and 2019 and $38,000 and $242,000 for the six months ended June 30, 2018 and 2019, respectively. Amortization of debt issuance costs on the Senior Notes was approximately $11,000 and $34,000 for the three months ended June 30, 2018 and 2019, respectively and approximately $11,000 and $68,000 for the six months ended June 30, 2018 and 2019, 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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