Business Segments (Reconciliation of Operating Profit (Loss) from Segments to Consolidated) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Business Segments [Abstract]
(Loss) income for reportable segments	$ (68,433)	$ 16,445	$ (47,246)	$ 36,496
Interest expense	(1,265)	(126)	(3,166)	(375)
Interest income	66	140	160	431
Other income	537	42	1,245	315
LIFO income	181	302	581	500
Equity in (loss) income of nonconsolidated investment	(299)	477	(312)	823
Corporate expense, cost of capital elimination and other unallocated charges	(989)	(3,423)	(6,974)	(8,782)
(Loss) Income before income taxes	$ (70,202)	$ 13,857	$ (55,712)	$ 29,408