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v3.21.1

Intangible Assets | 3 Months Ended
--- | ---
Mar. 31, 2021
Intangible Assets |
Intangible Assets | (6) Intangible Assets Intangible Assets Subject to Amortization, net ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | March 31, 2021 |  | December 31, 2020
​ | ​ | Gross | ​ | ​ | ​ | Net | ​ | Gross | ​ | ​ | ​ | Net
​ | ​ | carrying | ​ | Accumulated | ​ | carrying | ​ | carrying | ​ | Accumulated | ​ | carrying
​ |  | amount |  | amortization |  | amount |  | amount |  | amortization |  | amount
​ | ​ | amounts in thousands
Customer relationships | ​ | $ | 515,000 | ​ | (14,975) | ​ | 500,025 | ​ | ​ | 560,212 | ​ | (13,687) | ​ | 546,525
Other amortizable intangibles | ​ |  | 133,840 | ​ | (8,909) | ​ | 124,931 | ​ |  | 137,315 | ​ | (9,791) | ​ | 127,524
Total | ​ | $ | 648,840 | ​ | (23,884) | ​ | 624,956 | ​ | ​ | 697,527 | ​ | (23,478) | ​ | 674,049
​ Amortization expense for intangible assets with finite useful lives was $18.6 million and $437.0 thousand for the three months ended March 31, 2021 and 2020, respectively. Amortization expense for amortizable intangible assets for each of the five succeeding fiscal years is estimated to be (amounts in thousands): ​
​ | ​ | ​ | ​
Remainder of 2021 | ​ | $ | 55,172
2022 | ​ | $ | 63,880
2023 | ​ | $ | 57,570
2024 | ​ | $ | 51,698
2025 | ​ | $ | 50,246
​

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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