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Long-Term Debt and Short-Term Borrowings - Summary of cumulative effect adjustment upon adoption (Details) - USD ($) $ in Thousands | Apr. 01, 2021 | Jan. 01, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Long-term debt | $ 227,770 |  | $ 193,036
Deferred income taxes | 20,131 |  | 33,429
Capital in excess of par | 138,446 |  | 153,529
Retained earnings | $ 304,468 |  | $ 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 Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders. Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees. Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock. For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock. For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock. + References Reference 1: 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 2: 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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