Amount of cash and cash equivalents restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Name:	us-gaap_RestrictedCashAndCashEquivalents
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Supplemental Cash Flow Information (Cash and Restricted Cash) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Feb. 08, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Summary Of Significant Accounting Policies [Line Items]
Cash and cash equivalents	$ 12,984
Restricted cash	1,001
Cash from discontinued operations	0
Total cash, cash equivalents and restricted cash	$ 13,985	$ 10,345
Predecessor
Summary Of Significant Accounting Policies [Line Items]
Cash and cash equivalents		9,070	$ 3,660	$ 7,102
Restricted cash		1,275	1,269	433
Cash from discontinued operations		0	61	83
Total cash, cash equivalents and restricted cash		$ 10,345	$ 4,990	$ 7,618	$ 8,974