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Income Taxes Reconciliation of the change in unrecognized tax benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of the change in unrecognized tax benefits [Roll Forward]
Unrecognized Tax Benefits, beginning of period	$ 48,604	$ 21,502	$ 38,992
Increases related to tax positions taken during a prior period	5,389	20,555	224
Decreases related to tax positions taken during a prior period	(31,850)	(9,665)	(13,218)
Increases related to tax positions taken during the current period	8,411	18,895	114
Decreases related to settlements with taxing authorities	0	0	(707)
Reductions as a result of a lapse of the statute of limitations	0	(2,683)	(3,903)
Unrecognized Tax Benefits, end of period	$ 30,554	$ 48,604	$ 21,502

X

- Definition

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

+ References

No definition available.

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Amount of unrecognized tax benefits.

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-Publisher FASB
-Name Accounting Standards Codification
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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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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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