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Redeemable Non-Controlling Interest - Narrative (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Mar. 05, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Noncontrolling Interest [Line Items] |  |  |  |  |  |
Adjustment to redeemable non-controlling interest to reflect WEX Health at fair value |  | $ 17,720 | $ 0 |  | $ 41,400 |
Accretion of non-controlling interest |  | $ (17,720) |  | $ 0 | $ (17,720) | $ 0
Additional Paid-in Capital |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |
Adjustment to redeemable non-controlling interest to reflect WEX Health at fair value |  |  | $ (41,400) |  |  |
Discovery Benefits |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |
Ownership percentage by noncontrolling interest | 4.90% |  |  |  |  |
Discovery Benefits | Additional Paid-in Capital |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |
Adjustment to redeemable non-controlling interest to reflect WEX Health at fair value | $ 41,400 |  |  |  |  |
Discovery Benefits | Non–Controlling Interest |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |
Adjustment to redeemable non-controlling interest to reflect WEX Health at fair value | $ 41,400 |  |  |  |  |
Minimum | Discovery Benefits |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |
Call rights, exercise period |  |  |  |  | 5 years |
Maximum | Discovery Benefits |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |
Call rights, exercise period |  |  |  |  | 7 years |

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