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Benefit Plans (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Employer contributions | $ 12,800 |  |  |
Long-Term Incentive Plan (LTIP) [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Common Stock, Shares Authorized | 14,800,000 | 14,800,000 |  |
Shares reserved for issuance as awards | 2,500,000 | 2,500,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Granted in Period |  | 4,500,000 |  |
Share Options Award [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized compensation cost on awards | $ 0 | $ 0 |  |
Share options award, outstanding | 375,701 | 375,701 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price | $ 52.77 | $ 52.77 |  |
Share Appreciation Award [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share options award, outstanding | 530,923 | 530,923 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price | $ 50.70 | $ 50.70 |  |
Non-Vested Share Awards [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized compensation cost on awards | $ 115,900 | $ 115,900 |  |
Recognized compensation cost, weighted-average period, years |  | 1 year 8 months 12 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] |  |  |  |
Unrecognized compensation cost on awards | 800 | $ 800 |  |
Recognized compensation cost, weighted-average period, years |  | 1 year 1 month 6 days |  |
Share option awards, exercisable, increment |  | 3 years |  |
Performance awards, granted, aggregate grant-date fair value | $ 6,700 | $ 6,700 |  |
Performance awards, vested, aggregate fair value |  | 2,200 | $ 700 | $ 2,900
Recognized compensation expense |  | $ 3,200 | 8,200 | 8,400
Savings Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares reserved for issuance as awards | 1,000,000.0 | 1,000,000.0 |  |
Employee match |  | 100.00% |  |
Employer contributions |  | $ 18,700 | $ 14,400 | $ 12,200
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 | 100,000 | 100,000 |  |
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 | 2,300,000 | 2,300,000 |  |

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