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Senior Notes (Tables) | 6 Months Ended
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Jun. 30, 2022
Debt Disclosure [Abstract] |
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments | The carrying value of our 4.25% senior notes due 2029 (the “Senior Notes”) is reflected on our Consolidated Balance Sheet as follows (in thousands):
| December 31, 2021 |  | June 30, 2022
Long-term liabilities: |  |  |
Principal amount | $ | 400,000 |  |  | $ | 400,000 |
Debt discount, net of accumulated amortization of $301 and $544, respectively | (4,199) |  |  | (3,955) |
Debt issuance costs, net of accumulated amortization of $86 and $155, respectively | (1,191) |  |  | (1,122) |
Carrying value of the Senior Notes | $ | 394,610 |  |  | $ | 394,923 |
Schedule of Long-term Debt | Our Credit Facility and Acquisition debt consisted of the following (in thousands):
| December 31, 2021 |  | June 30, 2022
Credit Facility | $ | 155,400 |  |  | $ | 175,200 |
Debt issuance costs, net of accumulated amortization of $1,324 and $1,508, respectively | (1,543) |  |  | (1,699) |
Total Credit Facility | $ | 153,857 |  |  | $ | 173,501 |
Acquisition debt | $ | 4,500 |  |  | $ | 4,474 |
Less: current portion | (521) |  |  | (583) |
Total acquisition debt, net of current portion | $ | 3,979 |  |  | $ | 3,891 |
The imputed interest expense related to our acquisition debt is as follows (in thousands):
| Three months ended June 30, |  | Six months ended June 30,
| 2021 |  | 2022 |  | 2021 |  | 2022
Acquisition debt imputed interest expense | $ | 93 |  |  | $ | 79 |  |  | $ | 190 |  |  | $ | 159 |
The interest expense and amortization of debt discount, debt premium and debt issuance costs related to our Senior Notes are as follows (in thousands):
| Three months ended June 30, |  | Six months ended June 30,
| 2021 |  | 2022 |  | 2021 |  | 2022
Senior Notes interest expense | $ | 6,642 |  |  | $ | 4,230 |  |  | $ | 13,267 |  |  | $ | 8,480 |
Senior Notes amortization of debt discount | 128 |  |  | 122 |  |  | 266 |  |  | 243 |
Senior Notes amortization of debt premium | 27 |  |  | — |  |  | 85 |  |  | — |
Senior Notes amortization of debt issuance costs | 53 |  |  | 35 |  |  | 127 |  |  | 69 |

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- Definition Tabular disclosure of information pertaining to carrying amount and estimated fair value of short-term and long-term debt instruments or arrangements, including but not limited to, identification of terms, features, and collateral requirements. + References No definition available. + Details
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- Definition Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04(a)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24072-122690 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28541-108399 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21506-112644 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69B -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495735-112612 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28551-108399 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69E -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495743-112612 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21521-112644 Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21538-112644 Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123599511&loc=d3e64711-112823 Reference 11: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 Reference 12: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21475-112644 + Details
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