Income Taxes Reconciliation of the change in unrecognized tax benefits (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of the change in unrecognized tax benefits [Roll Forward]
Unrecognized Tax Benefits, beginning of period	$ 30,554	$ 48,604	$ 21,502
Increases related to tax positions taken during a prior period	2,376	5,389	20,555
Decreases related to tax positions taken during a prior period	(7,918)	(31,850)	(9,665)
Increases related to tax positions taken during the current period	16,332	8,411	18,895
Decreases related to settlements with taxing authorities	(1,044)	0	0
Reductions as a result of a lapse of the statute of limitations	0	0	(2,683)
Unrecognized Tax Benefits, end of period	$ 40,300	$ 30,554	$ 48,604

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

No definition available.

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Amount of unrecognized tax benefits.

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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