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Income Tax Contingencies (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |  |  |  |
Net interest and penalties expense | $ (42) | $ 315 | $ 259 | $ 739 |
Accrued interest | 2,383 |  | 2,383 |  | $ 2,127
Accrued penalties | 1,774 |  | 1,774 |  | 1,758
Unrecognized tax benefits related to uncertain tax positions | 115,282 |  | 115,282 |  | 112,558
The amount of unrecognized tax benefits that, if recognized, would affect our effective tax rate | $ 113,952 |  | $ 113,952 |  | $ 111,224

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