Business Segment Information (Schedule Of Reportable Segments Financial Information) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Segment Reporting Information [Line Items]
Operating revenues	$ 189,247	$ 393,955	$ 644,564	$ 1,090,373
Direct operating costs	(154,930)	(264,120)	(506,815)	(739,237)
Segment profits	34,317	129,835	137,749	351,136
Depreciation and amortization	60,328	54,485	181,488	157,975
Capital expenditures, (excluding acquisitions)	16,883	103,730	60,964	224,874
Identifiable assets	1,250,339	1,605,849	1,250,339	1,605,849	$ 1,597,177
Completion and Remedial Services
Segment Reporting Information [Line Items]
Operating revenues	67,240	193,699	249,070	495,550
Direct operating costs	(56,165)	(119,138)	(195,086)	(308,235)
Segment profits	11,075	74,561	53,984	187,315
Depreciation and amortization	21,163	17,530	63,518	50,827
Capital expenditures, (excluding acquisitions)	4,574	62,579	21,020	131,962
Identifiable assets	388,286	515,145	388,286	515,145
Fluid Services
Segment Reporting Information [Line Items]
Operating revenues	62,631	92,852	200,138	276,001
Direct operating costs	(47,706)	(66,121)	(150,218)	(197,958)
Segment profits	14,925	26,731	49,920	78,043
Depreciation and amortization	17,638	16,709	52,989	48,445
Capital expenditures, (excluding acquisitions)	6,851	25,010	15,786	46,050
Identifiable assets	268,060	316,152	268,060	316,152
Well Servicing
Segment Reporting Information [Line Items]
Operating revenues	55,533	91,119	175,701	273,660
Direct operating costs	(47,877)	(67,636)	(147,314)	(202,144)
Segment profits	7,656	23,483	28,387	71,516
Depreciation and amortization	15,061	14,263	45,582	41,355
Capital expenditures, (excluding acquisitions)	3,421	14,614	16,665	37,876
Identifiable assets	247,834	274,831	247,834	274,831
Contract Drilling
Segment Reporting Information [Line Items]
Operating revenues	3,843	16,285	19,655	45,162
Direct operating costs	(3,182)	(11,225)	(14,197)	(30,900)
Segment profits	661	5,060	5,458	14,262
Depreciation and amortization	3,536	3,332	10,601	9,661
Capital expenditures, (excluding acquisitions)	1,353	2,033	2,463	5,641
Identifiable assets	54,711	58,872	54,711	58,872
Corporate and Other
Segment Reporting Information [Line Items]
Depreciation and amortization	2,930	2,651	8,798	7,687
Capital expenditures, (excluding acquisitions)	684	(506)	5,030	3,345
Identifiable assets	$ 291,448	$ 440,849	$ 291,448	$ 440,849