Business Segments (Reconciliation of Operating Profit (Loss) from Segments to Consolidated) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Business Segments [Abstract]
Loss for reportable segments	$ (7,657)	$ (68,433)	$ (132,602)	$ (47,246)
Interest expense	(1,520)	(1,265)	(4,342)	(3,166)
Interest income	50	66	157	160
Other income	1,085	537	263	1,245
LIFO income	917	181	1,442	581
Equity in loss of nonconsolidated investment	(263)	(299)	(946)	(312)
Corporate expense, cost of capital elimination and other unallocated charges	(1,973)	(989)	(6,907)	(6,974)
Loss before income taxes	$ (9,361)	$ (70,202)	$ (142,935)	$ (55,712)