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Segment Information (Schedule Of Geographic Distribution Of Rigs By Segment) (Details)	Dec. 31, 2017 rigs contract
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	65
Number of drilling management contracts | contract	2
Floaters [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	27
Jackups [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	38
North & South America (Excluding Brazil) [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	14
North & South America (Excluding Brazil) [Member] | Floaters [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	8
North & South America (Excluding Brazil) [Member] | Jackups [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	6
Europe & Mediterranean [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	18
Europe & Mediterranean [Member] | Floaters [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	6
Europe & Mediterranean [Member] | Jackups [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	12
Middle East & Africa [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	15
Middle East & Africa [Member] | Floaters [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	4
Middle East & Africa [Member] | Jackups [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	11
Asia Pacific [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	14
Asia Pacific [Member] | Construction in Progress [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	3
Asia Pacific [Member] | Floaters [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	6
Asia Pacific [Member] | Floaters [Member] | Construction in Progress [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	2
Asia Pacific [Member] | Jackups [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	8
Asia Pacific [Member] | Jackups [Member] | Construction in Progress [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	1
Discontinued Operations, Held-for-sale [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	1
Discontinued Operations, Held-for-sale [Member] | Floaters [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	1
Discontinued Operations, Held-for-sale [Member] | Jackups [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	0

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