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Goodwill (Tables) | 6 Months Ended
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Jun. 30, 2019
Schedule of changes in the carrying amount of goodwill | The changes in the carrying amount of goodwill are as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, | ​ | December 31, | ​
​ |  | 2019 |  | 2018 |
Balance at beginning of year | ​ | $ | 235,182 | ​ | $ | 200,584 | ​
Additions (See Note 4) | ​ |  | 97,380 | ​ |  | 34,598 | ​
Impairment adjustment | ​ | ​ | — | ​ | ​ | — | ​
Balance at end of period | ​ | $ | 332,562 | ​ | $ | 235,182 | ​
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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13854-109267 + Details
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