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Long-Term Debt and Short-Term Borrowings - Summary of cumulative effect adjustment upon adoption (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Jan. 01, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Long-term debt | $ 236,611 |  | $ 193,036
Deferred income taxes | 22,061 |  | 33,429
Capital in excess of par | 143,276 |  | 153,529
Retained earnings | $ 282,861 |  | $ 331,897
Accounting Standards Update 2020-06 [Member] | Cumulative effect period of adoption adjustment |  |  |
Long-term debt |  | $ 21,393 |
Deferred income taxes |  | (5,584) |
Capital in excess of par |  | (16,511) |
Retained earnings |  | 702 |
Accounting Standards Update 2020-06 [Member] | Balance at January 1, 2021 |  |  |
Long-term debt |  | 214,429 |
Deferred income taxes |  | 27,845 |
Capital in excess of par |  | 137,018 |
Retained earnings |  | $ 332,599 |

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- Definition Amount of excess of issue price over par or stated value of stock and from other transaction involving stock or stockholder. Includes, but is not limited to, additional paid-in capital (APIC) for common and preferred stock. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 65 -Paragraph 15 -Subparagraph (g)(2) -URI http://asc.fasb.org/extlink&oid=121322162&loc=SL121327923-165333 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(30)(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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