Income Taxes (Schedule of Components of Deferred Income Tax Expense/(Benefit)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Net effect of temporary differences	$ 7,214	$ (7,615)	$ (1,667)
Foreign tax credits	(6,869)	(17,874)	(481)
Retirement benefits	1,734	1,844	1,438
Net impact to operating loss carryforwards	(603)	(5,722)	6,120
Enacted changes in tax laws and rates	183	670
Adjustments to beginning-of-the-year valuation allowance balance for changes in circumstances	(88)	75	(109)
Deferred income tax provision	$ 1,571	$ (28,622)	$ 5,301