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Income Taxes - Reconciliation of Unrecognized Tax Benefit (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at beginning of year	$ 36,229	$ 35,240	$ 54,541
Additions based on tax positions related to the current year	6,231	7,040	4,227
Additions for tax positions of prior years	9,377	3,372	2,048
Reductions for tax positions of prior years	(2,870)	(1,171)	(1,948)
Reductions for audit settlements	0	0	(180)
Reductions resulting from a lapse of the applicable statute of limitations periods	(7,857)	(8,252)	(23,448)
Balance at end of year	$ 41,110	$ 36,229	$ 35,240

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- Definition

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

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