The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Summary Of Significant Accounting Policies (Intangible And Other Long-Term Assets) (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Amortization expense exclusive of debt acquisition costs	$ 2,100	$ 5,600	$ 5,600
Amortization of intangible assets exclusive of debt acquisitions costs for 2019	1,200
Amortization of intangible assets exclusive of debt acquisitions costs for 2020	1,200
Amortization of intangible assets exclusive of debt acquisitions costs for 2021	1,200
Amortization of intangible assets exclusive of debt acquisitions costs for 2022	1,200
Amortization of intangible assets exclusive of debt acquisitions costs for 2023	1,200
Reduction in carrying value of intangibles	7,556	$ 21,689
Onshore Completion and Workover Services and Production Services [Member]
Finite-Lived Intangible Assets [Line Items]
Reduction in carrying value of intangibles	7,600
Pumpco [Member]
Finite-Lived Intangible Assets [Line Items]
Reduction in carrying value of intangibles	$ 57,700