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Goodwill and Other Intangible Assets - Summary of gross carrying amounts (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Other intangible assets |  |  |
Gross carrying amount | $ 258,654 |  | $ 258,554
Accumulated amortization | (104,793) |  | (95,962)
Net carrying amount | 153,861 |  | 162,592
Amortization expense | 9,164 | $ 3,007 |
Estimated amortization expense for other intangibles for each of the next five quarters |  |  |
June 30,2021 | 8,613 |  |
September 30,2021 | 8,201 |  |
December 31,2021 | 8,200 |  |
March 31,2022 | 7,931 |  |
June 30,2022 | 7,666 |  |
Thereafter | 113,250 |  |
Net carrying amount | $ 153,861 |  | $ 162,592
Minimum |  |  |
Other intangible assets |  |  |
Estimated useful lives | 2 years |  |
Maximum |  |  |
Other intangible assets |  |  |
Estimated useful lives | 15 years |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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