Unaudited Condensed Consolidated Statement of Changes in Net Assets (Liquidation Basis, Unaudited) - USD ($) $ in Thousands	1 Months Ended
	May 05, 2018		Apr. 18, 2018
Liquidation Basis of Accounting [Member] | Prepaid Expenses and Other Current Assets [Member]
Effects of adopting the liquidation basis of accounting			$ (972)
Liquidation Basis of Accounting [Member] | Property, Plant and Equipment [Member]
Effects of adopting the liquidation basis of accounting			(1,516)
Liquidation Basis of Accounting [Member] | Other Noncurrent Assets [Member]
Effects of adopting the liquidation basis of accounting			(192)
Liquidation Basis of Accounting [Member] | Accounts Payable [Member]
Changes in net assets in liquidation	$ (3,271)
Liquidation Basis of Accounting [Member] | Accrued Liabilities [Member]
Changes in net assets in liquidation	(1,321)
Liquidation Basis of Accounting [Member]
Shareholders’ equity as of April 17, 2018, pre-adoption of liquidation basis			264,809
Change in settlement of income taxes payable and deferred tax liability			(161)
Estimated liquidation and operating costs during liquidation			(17,934)
Total effects of adopting the liquidation basis of accounting			(20,775)
Net assets in liquidation	239,442	[1]	$ 244,034
Total changes in net assets in liquidation	$ (4,592)

[1] The net assets in liquidation amount may not equal the aggregate amount of cash available to shareholders for distribution in liquidation. Certain amounts reflected above, including income taxes payable, include amounts that are currently reserved but may not ultimately be required to be paid in cash