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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2019
Goodwill and Other Intangible Assets |
Summary of changes in the carrying amounts of goodwill | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended |
​ | ​ | December 31, |
(Dollars in thousands) | ​ | 2019 | ​ | 2018 |
Balance at beginning of period |  | $ | 1,002,900 |  | $ | 999,586 | ​
Additions: | ​ | ​ | ​ | ​ | ​ | ​ | ​
PSC acquisition Day 1 adjustment | ​ |  | — | ​ | ​ | 3,314 | ​
Balance at end of period | ​ | $ | 1,002,900 | ​ | $ | 1,002,900 | ​
Summary of gross carrying amounts and accumulated amortization of other intangible assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | December 31, |
(Dollars in thousands) |  | ​ | 2019 | ​ | 2018 |
Gross carrying amount | ​ |  | $ | 119,501 |  | $ | 121,736 | ​
Accumulated amortization | ​ | ​ |  | (69,685) | ​ |  | (58,836) | ​
​ | ​ | ​ | $ | 49,816 | ​ | $ | 62,900 | ​
Schedule of estimated amortization expense of intangibles assets | ​
​ | ​ | ​ | ​ | ​
(Dollars in thousands) | ​ | ​ | ​ | ​
Year ended December 31: |  | ​ |  | ​
2020 | ​ | $ | 11,867 | ​
2021 | ​ |  | 10,584 | ​
2022 | ​ |  | 9,266 | ​
2023 | ​ |  | 6,314 | ​
2024 | ​ |  | 3,940 | ​
Thereafter | ​ |  | 7,845 | ​
​ | ​ | $ | 49,816 | ​
​ | ​ | ​ | ​ | ​

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