Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Contingency [Line Items]
Unrecognized tax benefits	$ 83,214	$ 93,461	$ 68,034	$ 70,315
Additions based on tax positions related to the current year	4,493	15,580	14,466
Additions for tax positions of prior years	6,668	29,637	4,105
Reductions for tax positions of prior years	(9,217)	(5,226)	(9,653)
Settlements	(922)	(7,345)	(954)
Lapse of statutes	(11,269)	(7,219)	(10,245)
Unrecognized potential tax benefits that would impact effective tax rate	75,500
Potential interest and penalty expense (income)	(600)	2,400	$ (500)
Accrued interest and penalties	17,800	$ 18,800
Minimum [Member]
Income Tax Contingency [Line Items]
Significant change in unrecognized tax benefits is reasonably possible, estimated range of change, upper bound	0
Maximum [Member]
Income Tax Contingency [Line Items]
Significant change in unrecognized tax benefits is reasonably possible, estimated range of change, upper bound	$ 15,300

Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit.

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The amount of estimated penalties and interest accrued as of the balance sheet date arising from income tax examinations.

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