Liabilities Subject to Compromise (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Notes, loans and other debt/Interest payable	$ 74,275
Pension and other postretirement benefits obligation	676,472
Uncertain tax positions	41,117
Trade payables	28,810
Other accrued liabilities	14,872
Accrued royalties	2,834
Employee claims	357
Total liabilities subject to compromise	3,866,405	$ 0
Debt
Debt Instrument [Line Items]
Notes, loans and other debt/Interest payable	$ 3,027,668	$ 0