Income Taxes (Summary of Changes in Gross Amount of Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Uncertainties [Abstract]
Unrealized tax benefit, beginning balance	$ 33,766	$ 35,388	$ 34,798
Additions based on tax positions related to the current year	4,627	3,550	6,299
Additions based on tax positions related to prior years	0	4,255	0
Payments related to items settled with taxing authorities	(443)	(2,792)	0
Reduction due to lapse of statute of limitations and settlements	(6,475)	(6,635)	(5,709)
Unrealized tax benefit, ending balance	$ 31,475	$ 33,766	$ 35,388

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Amount of unrecognized tax benefits.

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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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