Business Acquisition (Schedule of Pro Forma Results of Operations) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Basic and diluted	6,970,000	6,951,000	6,930,000
Tech Ord [Member]
Business Acquisition [Line Items]
Net Sales			$ 347,833
Net Earnings			$ 26,197
Net earnings per share (basic and diluted)			$ 3.78
Basic and diluted			6,930,000