Debt and Financing Arrangements (Narrative) (Details) - USD ($)		3 Months Ended
	Mar. 07, 2017	Mar. 31, 2017	Mar. 31, 2016
Line of Credit Facility [Line Items]
Debt financing costs		$ 2,000,000	$ 2,200,000
New Term Loan Debt Facility [Member] | Senior Notes [Member]
Line of Credit Facility [Line Items]
Debt instrument, face amount	$ 300,000,000
Percentage of face amount	99.50%
Quarterly amortization payments	$ 750,000
Amount of voting equity interests of domestic subsidiaries guaranteed (percent)	100.00%
Amount of voting equity interests of foreign owned subsidiaries guaranteed (percent)	65.00%
Net cash proceeds of from debt issuances and other non-ordinary sales or dispositions (percent)	100.00%
Default to indebtedness	$ 50,000,000
Default to surety, reclamation or similar bond	50,000,000
Default to uninsured judgment	50,000,000
Uninsured losses or proceedings against	$ 50,000,000
New Term Loan Debt Facility [Member] | Senior Notes [Member] | LIBOR [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate (percent)	4.00%
New Term Loan Debt Facility [Member] | Senior Notes [Member] | Base Rate [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate (percent)	3.00%
Previous First Lien Debt Facility [Member] | Senior Notes [Member]
Line of Credit Facility [Line Items]
Debt financing costs		1,000,000
Minimum [Member] | New Term Loan Debt Facility [Member] | Senior Notes [Member] | LIBOR [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate (percent)	1.00%
Successor [Member]
Line of Credit Facility [Line Items]
Financing costs		2,030,000
Debt financing costs		7,228,000
Interest expense		(9,425,000)
Successor [Member] | New Term Loan Debt Facility [Member] | Senior Notes [Member]
Line of Credit Facility [Line Items]
Financing costs		$ 7,200,000
Predecessor [Member]
Line of Credit Facility [Line Items]
Financing costs			2,213,000
Debt financing costs			18,403,000
Interest expense			(44,451,000)
Predecessor [Member] | Superpriority Debtor-in Possession Credit Agreement [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Financing costs			$ 18,400,000