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Goodwill (Tables) | 12 Months Ended
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Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in Goodwill | The following table presents changes in goodwill in the accompanying Consolidated Balance Sheet for the years ended December 31, 2018 and 2019 (in thousands):
| December 31, 2018 |  | December 31, 2019
Goodwill at the beginning of year | $ | 287,956 |  |  | $ | 303,887 |
Increase in goodwill related to acquisitions | 16,777 |  |  | 99,344 |
Decrease in goodwill related to divestitures | — |  |  | (4,197 | )
Decrease in goodwill related to impairments | (846 | ) |  | (742 | )
Goodwill at the end of the year | $ | 303,887 |  |  | $ | 398,292 |

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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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