Discontinued Operations (Assets And Liabilities Of Discontinued Operation) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total current assets	$ 121,080	$ 216,197
Total liabilities	8,226	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	4,894	6,215
Total current assets	4,894	31,321
Property, plant and equipment, net	115,363	179,144
Operating lease ROU assets	823	5,732
Total assets	121,080	216,197
Accounts payable	495	14,370
Accrued expenses	4,335	24,751
Total current liabilities	4,830	39,121
Operating lease liabilities	2,994	5,415
Other long-term liabilities	402	402
Total liabilities	$ 8,226	$ 44,938