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Fair Value Measurements - Narrative (Details) - USD ($) $ in Thousands	9 Months Ended
	Oct. 01, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Predecessor | 7.5% Convertible Senior Notes due 2023
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Long-term debt, fixed interest rate				7.50%
Predecessor | Senior Notes | 8.75% Senior Notes due 2020
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Long-term debt, fixed interest rate	8.75%
Predecessor | Convertible Debt | 7.5% Convertible Senior Notes due 2023
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Long-term debt, fixed interest rate	7.50%
Predecessor | Level 2 | Senior Notes | 8.75% Senior Notes due 2020
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Write off of derivative holder conversion feature to reorganization items	$ 2,500
Long-term Debt Holder Conversion Feature | Predecessor
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Write off of derivative holder conversion feature to reorganization items	(7,281)
Long-term Debt Holder Conversion Feature | Predecessor | Level 3
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Write off of derivative holder conversion feature to reorganization items	$ (7,300)
Recurring Measurement Basis | Successor
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Investments		$ 5,072	$ 7,541
Recurring Measurement Basis | Successor | Level 1
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Investments		5,072	7,541
Recurring Measurement Basis | Successor | Level 2
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Investments		0	0
Recurring Measurement Basis | Successor | Level 3
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Investments		0	0
Recurring Measurement Basis | Other Current Assets | Successor | Level 1
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Investments		$ 5,100	2,800
Recurring Measurement Basis | Other Assets | Successor | Level 1
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Investments			$ 4,800

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Deferred Compensation Plan, Fair Value of Plan Assets

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- Definition

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- Definition

The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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