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Income Taxes - Reconciliation of our uncertain tax positions (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Change in unrecognized tax benefits |  |  |
Balance as of January 1 | $ 25,711 | $ 33,203 | $ 179,255
Additions for tax positions of prior years | 1,003 | 308 | 25,119
Reductions for tax positions of prior years | (860) | (7,800) | (171,171)
Settlements | (84) |  |
Balance as of December 31 | 25,770 | 25,711 | 33,203
Interest and penalties on unrecognized tax benefits | 7,700 | 6,700 | 9,700
Liability related to unrecognized tax benefit for accrued interest and penalties | $ 800 | $ 1,000 | $ 500

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