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Goodwill (Tables) | 9 Months Ended
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Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | The following table presents changes in goodwill in the accompanying Consolidated Balance Sheets for the year ended December 31, 2017 and period ended September 30, 2018 (in thousands):
| December 31, 2017 |  | September 30, 2018
Goodwill at the beginning of year | $ | 275,487 |  |  | $ | 287,956 |
Increase in goodwill related to acquisitions | 12,469 |  |  | 16,777 |
Goodwill at the end of the period | $ | 287,956 |  |  | $ | 304,733 |

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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 + Details
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