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Income Taxes - Reconciliation of Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of unrecognized tax benefits:
Gross tax contingencies - beginning of the period	$ 38,533	$ 59,466	$ 47,685
Gross additions based on tax positions related to the current year	3,147	4,067	3,704
Gross additions for tax positions of prior years	981	3,368	12,207
Gross reductions for tax positions of prior years	(2,865)	(2,789)	(1,740)
Lapses of statutes	(4,462)	(2,629)	(2,390)
Settlements	(14)	(22,950)	0
Gross tax contingencies - end of the period	$ 35,320	$ 38,533	$ 59,466

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

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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 decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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