Business Segment Information (Summary Of Intercompany Segment Revenues) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Segment Reporting Information [Line Items]
Net revenues	$ (166,016)	$ (305,587)	$ (355,657)	$ (559,159)
Intercompany Elimination [Member]
Segment Reporting Information [Line Items]
Net revenues	15,053	19,384	28,019	36,900
Well Intervention [Member] | Intercompany Elimination [Member]
Segment Reporting Information [Line Items]
Net revenues	6,417	7,956	11,363	13,417
Robotics [Member] | Intercompany Elimination [Member]
Segment Reporting Information [Line Items]
Net revenues	$ 8,636	$ 11,428	$ 16,656	$ 23,483