Property, Plant and Equipment (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Leasehold Improvements, Gross	$ 68,400	$ 74,900
Property, plant and equipment, net	664,949	1,109,126
Depreciation	180,200	$ 258,600	$ 312,400
Pumpco, Assets Held For Sale [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	$ 179,100