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Income Taxes - Summary of Changes in Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Unrecognized tax benefits at beginning of year $ 53,509 $ 52,159 $ 131,608
Increases resulting from tax positions taken during a prior period 12,723 12,333 4,121
Decreases resulting from tax positions taken during a prior period (817) (851) 0
Increases resulting from tax positions taken during the current period 7,815 4,572 3,169
Decreases related to settlements with taxing authorities (148) (8,670) (601)
Reductions related to the lapse of statute of limitations (9,948) (6,034) (86,138)
Unrecognized tax benefits at end of year $ 63,134 $ 53,509 $ 52,159