Business And Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Thousands	5 Months Ended	7 Months Ended	12 Months Ended
	Dec. 31, 2015	Aug. 14, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Business And Summary Of Significant Accounting Policies [Line Items]
Depreciation expense	$ 22,400	$ 34,500		$ 100,400	$ 102,900
Capitalized bank fees				9,700
Environmental remediation, compliance and management expenses			$ 11,100	17,000	14,600
Accrued liability relating to environmental remediation			5,900	6,900
Total costs capitalized	6,900		6,900	15,600
Amortization expense	300	200		500	1,000
Deferred costs	9,900		9,900	13,300
Amortized costs	2,100	4,300	2,100	6,600
Capitalized Bank Fees [Member]
Business And Summary Of Significant Accounting Policies [Line Items]
Amortization of capitalized bank fees			2,100	3,300	2,500
Other Assets [Member]
Business And Summary Of Significant Accounting Policies [Line Items]
Capitalized bank fees				9,700
Predecessor [Member]
Business And Summary Of Significant Accounting Policies [Line Items]
Amortization of capitalized bank fees		2,118		3,339	2,504
Predecessor [Member] | Rationalization Plan [Member] | Cost of Sales [Member]
Business And Summary Of Significant Accounting Policies [Line Items]
Accelerated depreciation		$ 1,372		26,037	$ 28,326
New Accounting Pronouncement, Early Adoption, Effect [Member]
Business And Summary Of Significant Accounting Policies [Line Items]
Reclassification of deferred tax assets	10,700		10,700	28,400
Reclassification of deferred tax liabilities	$ 23,300		$ 23,300	$ 7,200