Segment Information (Financial information for Company's segments) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Segment Reporting Information [Line Items]
Total revenues	$ 413,133	$ 917,235
Cost of services (exclusive of items shown separately below)	285,339	582,246
Depreciation, depletion, amortization and accretion	136,672	162,220
General and administrative expenses	103,155	150,962
Income from operations	(112,033)	21,807
Interest income (expense), net	(23,806)	(23,209)
Other Nonoperating Income (Expense)	7,755	(971)
Income (loss) from continuing operations before income taxes	(128,084)	(2,373)
Identifiable Assets	4,746,098		$ 4,914,244
Subsea and Technical Solutions [Member]
Segment Reporting Information [Line Items]
Total revenues	87,345	118,136
Cost of services (exclusive of items shown separately below)	50,601	75,016
Depreciation, depletion, amortization and accretion	11,676	14,602
General and administrative expenses	25,127	30,549
Income from operations	(59)	(2,031)
Interest income (expense), net	943	417
Income (loss) from continuing operations before income taxes	884	(1,614)
Identifiable Assets	732,483		794,149
Production Services [Member]
Segment Reporting Information [Line Items]
Total revenues	96,746	251,379
Cost of services (exclusive of items shown separately below)	73,874	191,222
Depreciation, depletion, amortization and accretion	23,585	39,046
General and administrative expenses	24,431	43,306
Income from operations	(25,144)	(22,195)
Interest income (expense), net	(793)	235
Income (loss) from continuing operations before income taxes	(25,937)	(21,960)
Identifiable Assets	870,763		967,719
Onshore Completion and Workover Services [Member]
Segment Reporting Information [Line Items]
Total revenues	132,472	351,084
Cost of services (exclusive of items shown separately below)	123,330	254,207
Depreciation, depletion, amortization and accretion	54,627	59,805
General and administrative expenses	25,050	38,264
Income from operations	(70,535)	(1,192)
Income (loss) from continuing operations before income taxes	(70,535)	(1,192)
Identifiable Assets	1,854,210		1,929,185
Drilling Products and Services [Member]
Segment Reporting Information [Line Items]
Total revenues	96,570	196,636
Cost of services (exclusive of items shown separately below)	37,534	61,801
Depreciation, depletion, amortization and accretion	46,784	48,767
General and administrative expenses	28,547	38,843
Income from operations	(16,295)	47,225
Income (loss) from continuing operations before income taxes	(16,295)	47,225
Identifiable Assets	1,288,642		$ 1,223,191
Unallocated [Member]
Segment Reporting Information [Line Items]
Interest income (expense), net	(23,956)	(23,861)
Other Nonoperating Income (Expense)	7,755	(971)
Income (loss) from continuing operations before income taxes	$ (16,201)	$ (24,832)