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Long-Term Debt, Carrying Value and Fair Value of Debt Outstanding (Details) - USD ($) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020
Carrying Value and Fair Value of Debt Outstanding [Abstract] |  |
Carrying value | $ 1,281,417,000 | $ 1,475,040,000
Fair value | 1,351,768,000 | 1,570,693,000
Unamortized debt discounts and issuance costs | (5,738,000) | (6,454,000)
Long-term Debt | 1,275,679,000 | 1,468,586,000
3.29% Senior Notes Due February, 27 2023 [Member] |  |
Carrying Value and Fair Value of Debt Outstanding [Abstract] |  |
Carrying value | 350,000,000 | 350,000,000
Fair value | $ 361,800,000 | 364,538,000
Interest rate | 3.29% |
Maturity Date | Feb. 27, 2023 |
4.2% Senior Notes Due March 1, 2028 [Member] |  |
Carrying Value and Fair Value of Debt Outstanding [Abstract] |  |
Carrying value | $ 500,000,000 | 500,000,000
Fair value | $ 558,551,000 | 581,115,000
Interest rate | 4.20% |
Maturity Date | Mar. 01, 2028 |
Credit line due June 30, 2021 [Member] |  |
Carrying Value and Fair Value of Debt Outstanding [Abstract] |  |
Carrying value | $ 0 | 0
Fair value | 0 | 0
Bank Note Payable [Member] |  |
Carrying Value and Fair Value of Debt Outstanding [Abstract] |  |
Carrying value | 1,417,000 | 40,000
Fair value | 1,417,000 | 40,000
Revolving Credit Facility [Member] |  |
Carrying Value and Fair Value of Debt Outstanding [Abstract] |  |
Carrying value | 55,000,000 | 250,000,000
Fair value | $ 55,000,000 | $ 250,000,000
Variable interest rates | 1.50% | 1.50%
Term Loan [Member] |  |
Carrying Value and Fair Value of Debt Outstanding [Abstract] |  |
Carrying value | $ 375,000,000 | $ 375,000,000
Fair value | 375,000,000 | $ 375,000,000
Long-term Debt | $ 343,750,000 |

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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=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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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -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 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + 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)(3) -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(a)(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 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 4: 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 + Details
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