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Long-Term Debt, Carrying Value and Fair Value of Debt Outstanding (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Carrying Value and Fair Value of Debt Outstanding [Abstract] |  |  |
Carrying value |  | $ 1,166,934,000 | $ 1,475,040,000
Fair value |  | 1,224,563,000 | 1,570,693,000
Unamortized debt discounts and issuance costs | [1] | (3,567,000) | (6,454,000)
Long-term debt |  | 1,163,367,000 | 1,468,586,000
Amount excluded on unamortized debt discounts and issuance costs |  | 1,403,000 |
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 |  | $ 358,390,000 | 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 |  | $ 549,239,000 | 581,115,000
Interest rate |  | 4.20% |
Maturity Date |  | Mar. 01, 2028 |
Bank Note Payable [Member] |  |  |
Carrying Value and Fair Value of Debt Outstanding [Abstract] |  |  |
Carrying value |  | $ 1,934,000 | 40,000
Fair value |  | 1,934,000 | 40,000
Revolving Credit Facility [Member] |  |  |
Carrying Value and Fair Value of Debt Outstanding [Abstract] |  |  |
Carrying value | [2] | 0 | 250,000,000
Fair value | [2] | $ 0 | $ 250,000,000
Variable interest rates |  | 1.50% | 1.50%
Maturity Date |  | Mar. 27, 2024 |
Term Loan [Member] |  |  |
Carrying Value and Fair Value of Debt Outstanding [Abstract] |  |  |
Carrying value | [2] | $ 315,000,000 | $ 375,000,000
Fair value | [2] | $ 315,000,000 | 375,000,000
Maturity Date |  | Mar. 27, 2024 |
Credit Line [Member] |  |  |
Carrying Value and Fair Value of Debt Outstanding [Abstract] |  |  |
Carrying value |  | $ 0 | 0
Fair value |  | $ 0 | $ 0
Maturity Date |  | Jun. 30, 2022 |
[1] | Excludes $1,403,000 attributable to the Revolving Credit Facility included in other assets at December 31, 2021.
[2] | Variable interest rate of 1.5% at both December 31, 2021 and 2020.

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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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