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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Contingency [Line Items] |  |  |  |
Unrecognized tax benefits | $ 93,461 | $ 68,034 | $ 70,315 | $ 66,088
Additions based on tax positions related to the current year | 15,580 | 14,466 | 7,929 |
Additions for tax positions of prior years | 29,637 | 4,105 | 9,076 |
Reductions for tax positions of prior years | (5,226) | (9,653) | (3,067) |
Settlements | (7,345) | (954) | (3,106) |
Lapse of statutes | (7,219) | (10,245) | (6,605) |
Unrecognized potential tax benefits that would impact effective tax rate | 85,400 |  |  |
Potential interest and penalty expense (income) | 2,400 | (500) | $ 700 |
Accrued interest and penalties | 18,800 | $ 16,500 |  |
Minimum [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Significant change in unrecognized tax benefits is reasonably possible, estimated range of change, upper bound | 0 |  |  |
Maximum [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Significant change in unrecognized tax benefits is reasonably possible, estimated range of change, upper bound | $ 12,500 |  |  |

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