Taxes (Schedule of Gross Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning Balance	$ 11,383	$ 7,455	$ 38,877
Additions based on tax positions related to the current year	3,228	0	2,979
Additions for tax positions of prior years	28,387	3,928	2,709
Reductions for tax positions of prior years	(634)
Reductions as a result of lapses in the statute of limitations	(3,271)	0	(37,110)	$ (37,100)
Ending Balance	$ 39,093	$ 11,383	$ 7,455	$ 38,877

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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- Definition

Amount of unrecognized tax benefits.

+ References

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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 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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