CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (Unaudited) - 3 months ended Mar. 31, 2016 - USD ($) shares in Thousands, $ in Thousands	Common Stock	Capital in Excess of Par Value	Retained Earnings	Accumulated Other Comprehensive Loss	Total
Balance at Dec. 31, 2015	$ 21,699		$ 948,551	$ (17,969)	$ 952,281
Balance (in shares) at Dec. 31, 2015	216,991
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock issued for stock incentive plans, net	$ 91	$ 1,940			2,031
Stock issued for stock incentive plans, net (in shares)	910
Stock purchased and retired	$ (29)	(2,343)	(819)		(3,191)
Stock purchased and retired (in shares)	(294)
Net loss			(32,511)		(32,511)
Pension adjustment, net of taxes				127	127
Foreign currency translation				692	692
Unrealized loss on securities, net of taxes				(9)	(9)
Excess tax benefits for share- based payments		$ 403			403
Balance at Mar. 31, 2016	$ 21,761		$ 915,221	$ (17,159)	$ 919,823
Balance (in shares) at Mar. 31, 2016	217,607