Business Acquisition (Schedule of Pro Forma Results of Operations) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Business Acquisition [Line Items]
Basic and diluted	6,951,000	6,930,000	6,907,000
Tech Ord [Member]
Business Acquisition [Line Items]
Net Sales		$ 412,998	$ 436,988
Net Earnings		$ 26,197	$ 40,996
Net earnings per share (basic and diluted)		$ 3.78	$ 5.94
Basic and diluted		6,930,000	6,907,000