Income Taxes (Schedule of Unrecognized Tax Benefits Roll Forward) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Taxes
Unrecognized Tax Benefits, Beginning Balance	$ 16,749	$ 19,107	$ 15,991
Increases related to current year tax positions	500	300	300
Increases related to prior year tax positions	503	271	5,452
Decreases related to prior year tax positions	(798)	(863)	(535)
Settlements with taxing authorities	(6,823)	(2,066)	(2,101)
Unrecognized Tax Benefits, Ending Balance	$ 10,131	$ 16,749	$ 19,107

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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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