Business Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Schedule of Reportable Segments Financial Information
Operating revenues	$ 361,518	$ 296,855	$ 732,415	$ 542,909
Direct operating costs	233,014	(185,317)	470,342	341,403
Segment profits	128,504	111,538	262,073	201,506
Depreciation and amortization	45,536	34,784	89,520	67,764
Capital expenditures, (excluding acquisitions)	39,910	42,431	86,733	114,873
Identifiable assets	1,510,382	1,329,107	1,510,382	1,329,107	1,459,928
Completion and Remedial Services [Member]
Schedule of Reportable Segments Financial Information
Operating revenues	156,560	121,807	320,980	219,314
Direct operating costs	93,098	(68,827)	190,123	123,760
Segment profits	63,462	52,980	130,857	95,554
Depreciation and amortization	13,644	9,841	26,495	17,909
Capital expenditures, (excluding acquisitions)	12,689	12,638	29,702	30,359
Identifiable assets	436,434	231,977	436,434	231,977
Fluid Services [Member]
Schedule of Reportable Segments Financial Information
Operating revenues	90,592	81,415	185,917	153,760
Direct operating costs	58,221	(51,688)	121,068	99,916
Segment profits	32,371	29,727	64,849	53,844
Depreciation and amortization	12,530	10,359	24,326	19,764
Capital expenditures, (excluding acquisitions)	10,377	12,847	19,429	33,503
Identifiable assets	253,582	195,403	253,582	195,403
Well Servicing [Member]
Schedule of Reportable Segments Financial Information
Operating revenues	98,723	83,881	194,625	153,028
Direct operating costs	71,864	(57,409)	139,114	105,849
Segment profits	26,859	26,472	55,511	47,179
Depreciation and amortization	14,574	10,398	28,915	22,351
Capital expenditures, (excluding acquisitions)	8,885	11,633	22,406	37,889
Identifiable assets	306,225	247,077	306,225	247,077
Contract Drilling [Member]
Schedule of Reportable Segments Financial Information
Operating revenues	15,643	9,752	30,893	16,807
Direct operating costs	9,831	(7,393)	20,037	11,878
Segment profits	5,812	2,359	10,856	4,929
Depreciation and amortization	2,642	2,326	5,390	4,233
Capital expenditures, (excluding acquisitions)	2,890	2,986	7,497	7,176
Identifiable assets	56,712	70,245	56,712	70,245
Corporate and Other [Member]
Schedule of Reportable Segments Financial Information
Operating revenues	0	0	0	0
Direct operating costs	0	0	0	0
Segment profits	0	0	0	0
Depreciation and amortization	2,146	1,860	4,394	3,507
Capital expenditures, (excluding acquisitions)	5,069	2,327	7,699	5,946
Identifiable assets	$ 457,399	$ 584,405	$ 457,399	$ 584,405