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Segment Information (Schedule Of Geographic Distribution Of Rigs By Segment) (Details) | Dec. 31, 2018 rigs
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Segment Reporting Information [Line Items] |
Total number of contract drilling rigs | 59
Floaters [Member] |
Segment Reporting Information [Line Items] |
Total number of contract drilling rigs | 24
Jackups [Member] |
Segment Reporting Information [Line Items] |
Total number of contract drilling rigs | 35
North & South America (Excluding Brazil) [Member] |
Segment Reporting Information [Line Items] |
Total number of contract drilling rigs | 12
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 | 4
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 | 7
Europe & Mediterranean [Member] | Jackups [Member] |
Segment Reporting Information [Line Items] |
Total number of contract drilling rigs | 11
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 | 3
Middle East & Africa [Member] | Jackups [Member] |
Segment Reporting Information [Line Items] |
Total number of contract drilling rigs | 12
Asia Pacific [Member] |
Segment Reporting Information [Line Items] |
Total number of contract drilling rigs | 11
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 | 4
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 | 7
Asia Pacific [Member] | Jackups [Member] | Construction in Progress [Member] |
Segment Reporting Information [Line Items] |
Total number of contract drilling rigs | 1

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