Consolidated Condensed Statement of Changes In Shareholders' Equity - 9 months ended Sep. 30, 2016 - USD ($) $ in Thousands	Total	Common Stock	Paid-in Capital	Accumulated Earnings	Accumulated Other Comprehensive Loss
Beginning Balance at Dec. 31, 2015	$ 384,291	$ 256,919	$ (1,282)	$ 180,324	$ (51,670)
Beginning Balance (in shares) at Dec. 31, 2015	36,321,775	36,322,000
Exercise of Common Stock options for cash	$ 1,038	$ 1,368	(330)
Exercise of Common Stock options for cash (in shares)		67,000
Tax benefit from exercises of Common Stock options	(277)		(277)
Cancellation of restricted stock	(1,196)	$ (1,196)
Cancellation of restricted stock (in shares)		(28,000)
Stock option compensation	3,349		3,349
Common Stock issued to Board of Directors and employees	3,507	$ 3,507
Common Stock issued to Board of Directors and employees (in shares)		134,000
Currency translation, net	3,953				3,953
Foreign currency hedge, net	(456)				(456)
Commodity hedge, net	343				343
Net income	50,562			50,562
Ending Balance at Sep. 30, 2016	$ 445,114	$ 260,598	$ 1,460	$ 230,886	$ (47,830)
Ending Balance (in shares) at Sep. 30, 2016	36,495,338	36,495,000