Chapter 11 Proceedings Chapter 11 Proceedings (Details) - USD ($)	6 Months Ended
	Jun. 30, 2016	May 25, 2016	May 10, 2016	Dec. 31, 2015
Reorganizations [Abstract]
Percentage of Common Stock Holders agreed to RSA	86.00%
Liabilities Subject to Compromise, Senior Notes	$ 1,075,000,000
Debtor Reorganization Items, Legal and Advisory Professional Fees	$ 7,237,000
Plan of Reorganization, percentage of common stock lenders to receive upon cancellation of all the outstanding indebtedness under the Senior Notes	100.00%
Percentage of claims responsible for related to pre-petition revolving credit agreement		100.00%
Percent of Common Stock of Ad Hoc Equity Committee	300.00%
Liabilities Subject to Compromise, Debt and Accrued Interest	$ 1,122,000,000
Plan of Reorganization, percentage of commons stock lenders to receive net of backstop fee	43.40%
Plan of Reorganization, backstop fee	3.20%
Debtor-in-Possession Financing, Amount Arranged	$ 25,000,000
Backstop Commitment Agreement, Backstop Commitment			$ 50,000,000
Backstop Commitment Agreement, Commitment Premium percentage			6.00%
Backstop Commitment Agreement, Termination Fee Percentage of the Rights Offering Amount			4.00%
Rights Offering, Rights Offering Amount	50,000,000
Rights Offering, Backstop Parties purchase price of shares of New Common Stock that are not duly subscribed for pursuant to the Rights Offering	$ 45,100,000
Substantial Stockholder percentage	450.00%
Liabilities Subject to Compromise, Interest on Senior Notes	$ 47,213,000
Liabilities Subject to Compromise, Restructuring Reserve	12,719,000
Liabilities Subject to Compromise, Compensation	9,733,000
Liabilities Subject to Compromise, Deferred Compensation	4,605,000
Liabilities Subject to Compromise, Pension and Other Postretirement Obligations	1,221,000
Liabilities Subject to Compromise, Postretirement health care benefit obligations	883,000
Liabilities Subject to Compromise, Accounts Payable	1,892,000
Liabilities Subject to Compromise, Litigation claims	1,092,000
Liabilities Subject to Compromise, Other accrued liabilities	3,997,000
Liabilities Subject to Compromise	1,158,355,000			$ 0
Debtor Reorganization Items, DIP Facility Costs and Commitment fees	143,000
Debtor Reorganization Items, Adjustment to pre-petition liabilities	0
Debtor Reorganization Items	$ 7,380,000