Discontinued Operations (Assets And Liabilities Of Discontinued Operation) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total current assets	$ 51,748	$ 216,197
Total liabilities	5,760	44,938
Pumpco [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Accounts receivable, net		25,106
Other current assets	2,280	6,215
Total current assets	2,280	31,321
Property, plant and equipment, net	49,259	179,144
Operating lease ROU assets	209	5,732
Total assets	51,748	216,197
Accounts payable	136	14,370
Accrued expenses	2,869	24,751
Total current liabilities	3,005	39,121
Operating lease liabilities	2,755	5,415
Other long-term liabilities		402
Total liabilities	$ 5,760	$ 44,938