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Debt, Debt Facilities (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020 | Apr. 18, 2018
Debt [Abstract] |  |  |  |
Current portion of long-term debt |  | $ 90,000 | $ 30,000 |
Credit Agreement [Member] |  |  |  |
Debt [Abstract] |  |  |  |
Unamortized debt issuance costs |  | 1,900 | 2,100 |
Credit Agreement Term Loan Facility [Member] |  |  |  |
Debt [Abstract] |  |  |  |
Original principal amount |  | 400,000 |  | $ 400,000
Balance | [1],[2] | $ 330,000 | 337,500 |
Interest rate |  | Variable 30 day: 1.86% |  |
Interest rate |  | 1.86% |  |
Term of variable rate |  | 30 days |  |
Repayment terms |  | 35% of the principal amount is payable in increasing quarterly installments over a five-year period that began on June 30, 2018, with the remainder payable at the end of the five-year term. |  |
Percentage of principal payable in installments |  | 35.00% |  |
Term of loan |  | 5 years |  |
Current portion of long-term debt |  | $ 30,000 | 30,000 |
Credit Agreement Revolving Credit Facility [Member] |  |  |  |
Debt [Abstract] |  |  |  |
Balance | [1],[2] | $ 60,000 | $ 0 |
Interest rate |  | Variable 30 day: 1.86% |  |
Interest rate |  | 1.86% |  |
Term of variable rate |  | 30 days |  |
Repayment terms |  | Revolving line of credit expires April 18, 2023. |  |
Term of loan |  | 5 years |  |
[1] | As of March 31, 2021 and December 31, 2020, the current portion of the Company’s debt (i.e. becoming due in the next 12 months) included $30.0 million of the balance of its term loan under the Credit Agreement.
[2] | The carrying value of the debt reflects the amounts stated in the above table, less debt issuance costs of $1.9 million and $2.1 million as of March 31, 2021 and December 31, 2020, respectively, related to the Credit Agreement, which are not reflected in this table.

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: 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 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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