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Goodwill (Tables) | 12 Months Ended
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Dec. 31, 2018
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, 2017 and 2018 (in thousands):
| December 31, 2017 |  | December 31, 2018
Goodwill at the beginning of year | $ | 275,487 |  |  | $ | 287,956 |
Increase in goodwill related to acquisitions | 12,469 |  |  | 16,777 |
Decrease in goodwill related to impairments | — |  |  | (846 | )
Goodwill at the end of the year | $ | 287,956 |  |  | $ | 303,887 |

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