Income Taxes (Schedule of Components of Income Tax Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Tax Disclosure [Abstract]
Income tax based on income from continuing operations, at estimated tax rates of 36.4% and 37.5%, respectively	$ 6,935	$ 7,838	$ 14,420	$ 21,545
Provision for change in estimated tax rates	741	(424)
Income tax before discrete items	7,676	7,414	14,420	21,545
Discrete tax expense:
Provision for/resolution of tax audits and contingencies, net			961	(825)
Adjustments to prior period tax liabilities	(73)	(11)	606	(254)
Other discrete tax adjustments, net	(7)	85	(62)	113
Provision for/adjustment to beginning of year valuation allowance	(3,787)		(3,787)
Enacted tax legislation				34
Total income tax expense	$ 3,809	$ 7,488	$ 12,138	$ 20,613