Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Name:	us-gaap_GoodwillImpairmentLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Note 3 - Impairment Charges and Other Costs (Details Textual) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Goodwill, Impairment Loss	$ 0	$ 0		$ 0	$ 24,413
Equity Method Investment, Other than Temporary Impairment					9,600
Nonoperating Income (Expense) [Member]
Litigation Settlement, Expense				66,000
Legal, Accounting and Investigation Fees	$ 6,200	$ 13,500		$ 13,400	$ 18,700
Water and Mineral Services Group Materials [Member]
Goodwill, Impairment Loss			$ 14,800
Water and Minerals Services Group Specialty [Member]
Goodwill, Impairment Loss			$ 0