Income Taxes (Schedule of Components of Income Tax Expense) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Tax Disclosure [Abstract]
Income tax based on income from continuing operations, at estimated tax rates of 32.5% and 32.6%, respectively	$ 4,899	$ 5,719
Income tax before discrete items	4,899	5,719
Discrete tax expense:
Exercise of US Stock Options	(123)	(21)
Adjustments to prior period tax liabilities	(46)
Provision for/resolution of tax audits and contingencies, net	5	852
Other	(126)
Total income tax expense	$ 4,609	$ 6,550