CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (Unaudited) - 6 months ended Jun. 30, 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	$ 85	$ 4,648			4,733
Stock issued for stock incentive plans, net (in shares)	851
Stock purchased and retired	$ (29)	(4,933)	1,768		(3,194)
Stock purchased and retired (in shares)	(294)
Net loss			(81,197)		(81,197)
Pension adjustment, net of taxes				254	254
Foreign currency translation				856	856
Unrealized loss on securities, net of taxes				(9)	(9)
Excess tax benefits for share- based payments		$ 285			285
Balance at Jun. 30, 2016	$ 21,755		$ 869,122	$ (16,868)	$ 874,009
Balance (in shares) at Jun. 30, 2016	217,548