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Acquisitions - Narrative (Details) - USD ($) $ in Thousands |  |  | 6 Months Ended |
--- | --- | --- | --- | ---
Jul. 01, 2019 | Jan. 02, 2019 | Jun. 30, 2019 | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |  |
Goodwill |  |  | $ 29,458 | $ 47,396
Benefit Consultants Group Inc. |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Transaction value |  | $ 25,000 |  |
Finite-lived intangible assets acquired |  | 16,200 |  |
Goodwill |  | $ 10,100 |  |
Minimum | Benefit Consultants Group Inc. |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquired finite-lived intangible assets, useful lives |  |  | 10 years |
Maximum | Benefit Consultants Group Inc. |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquired finite-lived intangible assets, useful lives |  |  | 16 years |
Subsequent Event [Member] | NTA |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Transaction value | $ 425,000 |  |  |
Transaction value, share of adjusted earnings | $ 20,000 |  |  |

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