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Debt and Credit Agreements - Schedule of Debt (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Instrument [Line Items] |  |
Unamortized debt issuance costs | $ (2,491) | $ (3,076)
Long-term debt | 946,509 | 1,133,924
Current portion of long-term debt | $ 0 | 188,000
6.51% weighted-average senior notes |  |
Debt Instrument [Line Items] |  |
Weighted average interest rate | 6.51% |
Total debt | $ 37,000 | 37,000
5.58% weighted-average senior notes |  |
Debt Instrument [Line Items] |  |
Weighted average interest rate | 5.58% |
Total debt | $ 87,000 | 175,000
Current portion of long-term debt |  | 88,000
3.65% weighted-average senior notes |  |
Debt Instrument [Line Items] |  |
Weighted average interest rate | 3.65% |
Total debt | $ 825,000 | 925,000
Current portion of long-term debt | $ 100,000 | $ 100,000

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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=123466204&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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