Income Taxes (Schedule of Components of Income Tax Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Tax Disclosure [Abstract]
Income tax based on income from continuing operations, at estimated tax rates of 29.7% and 36.4%, respectively	$ 11,857	$ 6,935	$ 27,409	$ 14,420
Provision for change in estimated tax rates	(227)	741
Income tax before discrete items	11,630	7,676	27,409	14,420
Discrete tax expense:
Exercise of U.S. Stock Options	(29)		(155)
Impact of Mandatory Repatriation			(1,099)
Adjustments to prior period tax liabilities	(7)	(73)	(259)	606
Provision for/resolution of tax audits and contingencies, net	(166)		2,282	961
Changes in Opening Valuation Allowance	63	(3,787)	(4,923)	(3,787)
Other		(7)	(124)	(62)
Total income tax expense	$ 11,491	$ 3,809	$ 23,131	$ 12,138