Segment Information (Financial information for Company's segments) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Segment Reporting Information [Line Items]
Total revenues	$ 1,209,026	$ 1,096,412	$ 3,377,996	$ 3,274,413
Cost of services (exclusive of items shown separately below)	721,692	671,632	2,023,590	1,969,930
Depreciation, depletion, amortization and accretion	170,154	152,028	493,437	446,432
General and administrative expenses	154,859	147,364	457,631	440,812
Income from operations	162,321	125,388	403,338	417,239
Interest income (expense), net	(24,169)	(25,564)	(72,610)	(81,610)
Other Nonoperating Income (Expense)	(2,051)	(1,697)	(1,480)	41
Loss on early extinguishment of debt				(884)
Income (loss) from continuing operations before income taxes	136,101	98,127	329,248	334,786
Identifiable Assets	7,463,940		7,463,940		7,411,307
Subsea and Technical Solutions [Member]
Segment Reporting Information [Line Items]
Total revenues	150,180	123,151	419,922	341,089
Cost of services (exclusive of items shown separately below)	79,415	70,508	223,938	188,002
Depreciation, depletion, amortization and accretion	22,016	11,508	54,964	29,282
General and administrative expenses	32,694	27,549	87,943	76,675
Income from operations	16,055	13,586	53,077	47,130
Interest income (expense), net	404	743	1,167	2,195
Income (loss) from continuing operations before income taxes	16,459	14,329	54,244	49,325
Identifiable Assets	1,045,138		1,045,138		1,015,105
Production Services [Member]
Segment Reporting Information [Line Items]
Total revenues	348,793	359,722	1,013,904	1,096,185
Cost of services (exclusive of items shown separately below)	248,567	251,575	706,911	756,954
Depreciation, depletion, amortization and accretion	41,225	45,554	123,213	133,361
General and administrative expenses	45,627	46,735	138,058	143,349
Income from operations	13,374	15,858	45,722	62,521
Income (loss) from continuing operations before income taxes	13,374	15,858	45,722	62,521
Identifiable Assets	2,123,888		2,123,888		2,176,785
Onshore Completion and Workover Services [Member]
Segment Reporting Information [Line Items]
Total revenues	470,849	398,016	1,258,774	1,222,215
Cost of services (exclusive of items shown separately below)	317,433	275,676	876,575	819,472
Depreciation, depletion, amortization and accretion	59,009	52,576	174,995	158,021
General and administrative expenses	39,625	37,216	114,604	116,786
Income from operations	54,782	32,548	92,600	127,936
Income (loss) from continuing operations before income taxes	54,782	32,548	92,600	127,936
Identifiable Assets	3,012,785		3,012,785		2,973,916
Drilling Products and Services [Member]
Segment Reporting Information [Line Items]
Total revenues	239,204	215,523	685,396	614,924
Cost of services (exclusive of items shown separately below)	76,277	73,873	216,166	205,502
Depreciation, depletion, amortization and accretion	47,904	42,390	140,265	125,768
General and administrative expenses	36,913	35,864	117,026	104,002
Income from operations	78,110	63,396	211,939	179,652
Income (loss) from continuing operations before income taxes	78,110	63,396	211,939	179,652
Identifiable Assets	1,282,129		1,282,129		1,245,501
Unallocated [Member]
Segment Reporting Information [Line Items]
Interest income (expense), net	(24,573)	(26,307)	(73,777)	(83,805)
Other Nonoperating Income (Expense)	(2,051)	(1,697)	(1,480)	41
Loss on early extinguishment of debt				(884)
Income (loss) from continuing operations before income taxes	$ (26,624)	$ (28,004)	$ (75,257)	$ (84,648)