Segment Information (Financial information for Company's segments) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Segment Reporting Information [Line Items]
Total revenues	$ 710,784	$ 1,107,552	$ 1,628,019	$ 2,168,970
Cost of services (exclusive of items shown separately below)	465,533	650,293	1,047,779	1,301,898
Depreciation, depletion, amortization and accretion	158,352	160,965	320,572	323,283
General and administrative expenses	129,661	146,853	280,623	302,772
Reduction in value of assets	807,637		807,637
Income from operations	(850,399)	149,441	(828,592)	241,017
Interest income (expense), net	(25,382)	(24,560)	(48,591)	(48,441)
Other Nonoperating Income (Expense)	(6,524)	606	(7,495)	571
Income (loss) from continuing operations before income taxes	(882,305)	125,487	(884,678)	193,147
Identifiable Assets	6,215,587		6,215,587		$ 7,377,389
Disposal Group, Including Discontinued Operation, Assets	131,600		131,600		116,700
Subsea and Technical Solutions [Member]
Segment Reporting Information [Line Items]
Total revenues	127,007	139,646	242,322	269,742
Cost of services (exclusive of items shown separately below)	77,991	71,530	151,557	144,523
Depreciation, depletion, amortization and accretion	16,473	18,059	30,638	32,948
General and administrative expenses	29,066	26,646	58,094	55,249
Income from operations	3,477	23,411	2,033	37,022
Interest income (expense), net	424	398	841	763
Income (loss) from continuing operations before income taxes	3,901	23,809	2,874	37,785
Identifiable Assets	926,833		926,833		946,813
Production Services [Member]
Segment Reporting Information [Line Items]
Total revenues	208,744	343,876	460,213	665,111
Cost of services (exclusive of items shown separately below)	156,615	231,119	347,929	458,344
Depreciation, depletion, amortization and accretion	36,671	40,180	75,831	81,988
General and administrative expenses	36,435	45,243	80,117	92,431
Reduction in value of assets	751,577		751,577
Income from operations	(772,554)	27,334	(795,241)	32,348
Interest income (expense), net	(369)		(134)
Income (loss) from continuing operations before income taxes	(772,923)	27,334	(795,375)	32,348
Identifiable Assets	1,160,351		1,160,351		2,116,171
Onshore Completion and Workover Services [Member]
Segment Reporting Information [Line Items]
Total revenues	226,363	398,048	577,355	787,925
Cost of services (exclusive of items shown separately below)	182,143	274,907	436,258	559,142
Depreciation, depletion, amortization and accretion	55,479	55,382	115,290	115,986
General and administrative expenses	33,031	36,011	71,323	74,979
Reduction in value of assets	40,263		40,263
Income from operations	(84,553)	31,748	(85,779)	37,818
Income (loss) from continuing operations before income taxes	(84,553)	31,748	(85,779)	37,818
Identifiable Assets	2,785,323		2,785,323		3,010,295
Drilling Products and Services [Member]
Segment Reporting Information [Line Items]
Total revenues	148,670	225,982	348,129	446,192
Cost of services (exclusive of items shown separately below)	48,784	72,737	112,035	139,889
Depreciation, depletion, amortization and accretion	49,729	47,344	98,813	92,361
General and administrative expenses	31,129	38,953	71,089	80,113
Reduction in value of assets	15,797		15,797
Income from operations	3,231	66,948	50,395	133,829
Income (loss) from continuing operations before income taxes	3,231	66,948	50,395	133,829
Identifiable Assets	1,343,080		1,343,080		$ 1,304,110
Unallocated [Member]
Segment Reporting Information [Line Items]
Interest income (expense), net	(25,437)	(24,958)	(49,298)	(49,204)
Other Nonoperating Income (Expense)	(6,524)	606	(7,495)	571
Income (loss) from continuing operations before income taxes	$ (31,961)	$ (24,352)	$ (56,793)	$ (48,633)