Discontinued Operations (Assets And Liabilities of Disposal Groups) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total assets	$ 216,197
Total current liabilities	44,938
Pumpco [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total assets	216,200
Pumpco [Member] | Discontinued Operations, Held-for-sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Accounts receivable, net	25,106	$ 98,003
Other current assets	6,215	21,474
Total current assets	31,321	119,477
Property, plant and equipment, net	179,144	248,874
Operating lease ROU assets	5,732
Intangible and other assets		67,421
Total assets	216,197	435,772
Accounts payable	14,370	60,576
Accrued expenses	24,751	12,073
Total current liabilities	39,121	72,649
Operating lease liabilities	5,415
Other long-term liabilities	402	848
Total current liabilities	$ 44,938	$ 73,497