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Benefit Plans (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price	$ 25.97
Long-Term Incentive Plan (LTIP) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock, Shares Authorized	32,000,000
Shares reserved for issuance as awards	18,200,000
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	896,279
Non-Vested Share Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost on awards	$ 74,800
Recognized compensation cost, weighted-average period, years	1 year 11 months 19 days
Non-Vested Share Awards [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share awards, vest rate	33.00%
Non-Vested Share Awards [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share awards, vest rate	20.00%
Non-Vested Share Awards, Liability Classified [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	4,968,000
Non Vested Share Awards, Equity Classified [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	1,433,000
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	$ 8,200
Recognized compensation cost, weighted-average period, years		1 year 9 months 18 days
Share option awards, exercisable, increment	3 years
Performance awards, granted, aggregate grant-date fair value	$ 6,700	$ 6,100	$ 8,300
Performance awards, vested, aggregate fair value	2,900	2,800	4,600
Recognized compensation expense	$ 8,400	3,100	2,900
Savings Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for issuance as awards	1,000,000
Share awards, vest rate	33.00%
Share option awards, exercisable, increment	3 years
Employee match	100.00%
Total matching contributions	$ 12,200	16,700	18,900
Profit sharing contribution provisions		$ 19,200	$ 27,500
Savings Plan [Member] | Maximum [Member]
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	1,600,000

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