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Share Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Employer contributions | $ 12,800 | $ 11,500 |  |
Long-Term Incentive Plan (LTIP) [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Common Stock, Shares Authorized |  | 8,200,000 |  | 10,500,000
Shares reserved for issuance as awards |  | 12,200,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Granted in Period |  | 1,100,000 |  |
Share Options Award [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized compensation cost on awards |  | $ 0 |  |
Share options award, outstanding |  | 318,377 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price |  | $ 44.94 |  |
Share Appreciation Award [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share options award, outstanding |  | 426,049 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price |  | $ 53,230,000 |  |
Non-Vested Share Awards [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Granted in Period |  | 66,000 |  |
Unrecognized compensation cost on awards |  | $ 30,400 |  |
Recognized compensation cost, weighted-average period, years |  | 1 year 4 months 24 days |  |
Non-Vested Share Awards [Member] | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share awards, vest rate |  | 33.00% |  |
Non-Vested Share Awards [Member] | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share awards, vest rate |  | 20.00% |  |
Exercisable In Increments Over Three-Year Period [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share awards, vest rate |  | 33.00% |  |
Exercisable In Increments Over Four-Year Period [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share awards, vest rate |  | 25.00% |  |
Performance Awards [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Recognized compensation cost, weighted-average period, years |  | 3 months |  |
Share option awards, exercisable, increment |  | 3 years |  |
Performance awards, granted, aggregate grant-date fair value |  | $ 6,700 |  |
Performance awards, vested, aggregate fair value |  | 5,200 | $ 2,200 | $ 700
Recognized compensation expense |  | $ 1,000 | 3,200 | 8,200
Savings Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Employee match |  | 100.00% |  |
Employer contributions |  | $ 8,800 | $ 18,700 | $ 14,400
Savings Plan [Member] | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Maximum percentage of eligible employee compensation to be matched by employer |  | 5.00% |  |
Atwood Oceanics, Inc. | Long-Term Incentive Plan (LTIP) [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares reserved for issuance as awards |  | 200,000 |  |
Rowan Companies [Member] | Long-Term Incentive Plan (LTIP) [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares reserved for issuance as awards |  | 2,600,000 |  |

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