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Segment Information (Schedule Of Geographic Distribution Of Rigs By Segment) (Details)	Dec. 31, 2015 rigs contract
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	68
Number of drilling management contracts | contract	3
Floaters [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	26
Jackups [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	42
Middle East, Africa, Asia & Pacific Rim [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	24
Middle East, Africa, Asia & Pacific Rim [Member] | Floaters [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	6
Middle East, Africa, Asia & Pacific Rim [Member] | Jackups [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	18
North & South America (Excluding Brazil) [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	20
North & South America (Excluding Brazil) [Member] | Floaters [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	13
North & South America (Excluding Brazil) [Member] | Jackups [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	7
Europe & Mediterranean [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	14
Europe & Mediterranean [Member] | Floaters [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	3
Europe & Mediterranean [Member] | Jackups [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	11
Asia & Pacific Rim (Under Construction) [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	4
Asia & Pacific Rim (Under Construction) [Member] | Floaters [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	1
Asia & Pacific Rim (Under Construction) [Member] | Jackups [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	3
Middle East Under Construction [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	6
Middle East Under Construction [Member] | Floaters [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	3
Middle East Under Construction [Member] | Jackups [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	3

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