Acquisitions (Schedule Of Values At Date Of Acquisition) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Total Cash Paid (net of cash acquired)	$ 16,730	$ 16,090
Proceeds from debt	$ 8,816	16,000
Pioneer Fishing And Rental, Inc [Member]
Business Acquisition [Line Items]
Closing Date	Sep. 17, 2014
Total Cash Paid (net of cash acquired)		$ 16,090
Harbor Resources, LLC [Member]
Business Acquisition [Line Items]
Closing Date	Jul. 17, 2015
Total Cash Paid (net of cash acquired)	$ 4,500
Aerion Rental, LLC [Member]
Business Acquisition [Line Items]
Closing Date	Jul. 24, 2015
Total Cash Paid (net of cash acquired)	$ 1,997
Grey Rock Pressure Pumping, LLC [Member]
Business Acquisition [Line Items]
Closing Date	Aug. 31, 2015
Total Cash Paid (net of cash acquired)	$ 10,233
Proceeds from debt	$ 8,800