CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (Unaudited) - 9 months ended Sep. 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	$ 83	$ 7,353			7,436
Stock issued for stock incentive plans, net (in shares)	827
Stock purchased and retired	$ (30)	(7,713)	4,525		(3,218)
Stock purchased and retired (in shares)	(296)
Net loss			(120,139)		(120,139)
Pension adjustment, net of taxes				380	380
Foreign currency translation				712	712
Unrealized loss on securities, net of taxes				(2)	(2)
Excess tax benefits for share- based payments		$ 360			360
Balance at Sep. 30, 2016	$ 21,752		$ 832,937	$ (16,879)	$ 837,810
Balance (in shares) at Sep. 30, 2016	217,522