Goodwill and Intangible Assets Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Changes in carrying amounts of goodwill
Beginning Goodwill Gross			$ 129,350
Accumulated impairment losses			(116,377)
Goodwill Net Beginning Balance			12,973
Goodwill, Impairment Loss	$ 0	$ (56,160)	0	$ (56,160)
Ending Goodwill Gross	129,350		129,350		$ 129,350
Goodwill Net Ending Balance	12,973		12,973		12,973
Metals Segment [Member]
Changes in carrying amounts of goodwill
Beginning Goodwill Gross			116,377
Accumulated impairment losses			(116,377)
Goodwill Net Beginning Balance			0
Ending Goodwill Gross	116,377		116,377		116,377
Goodwill Net Ending Balance	0		0		0
Plastics Segment
Changes in carrying amounts of goodwill
Beginning Goodwill Gross			12,973
Accumulated impairment losses			0
Goodwill Net Beginning Balance			12,973
Goodwill, Impairment Loss					0
Ending Goodwill Gross	12,973		12,973		12,973
Goodwill Net Ending Balance	$ 12,973		$ 12,973		$ 12,973