Consolidated Statements of Operations and Comprehensive Income (Loss) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Revenues:
Total revenues	$ 325,723	$ 361,518	$ 630,074	$ 732,415
Expenses:
General and administrative, including stock-based compensation of $3,312 and $3,200 in three months and $6,129 and $5,372 in the six months ended June 30, 2013 and 2012, respectively	49,321	45,540	91,278	86,898
Depreciation and amortization	52,067	45,536	101,848	89,520
Loss on disposal of assets	790	980	1,879	2,699
Total expenses	324,690	325,070	628,565	649,459
Operating income	1,033	36,448	1,509	82,956
Other income (expense):
Interest expense	(16,806)	(14,832)	(33,614)	(30,055)
Interest income	13	11	30	23
Other income	173	215	335	364
Income (loss) from continuing operations before income taxes	(15,587)	21,842	(31,740)	53,288
Income tax benefit (expense)	2,790	(7,105)	10,166	(18,920)
Net income (loss)	(12,797)	14,737	(21,574)	34,368
Earnings per share of common stock:
Basic	$ (0.32)	$ 0.36	$ (0.53)	$ 0.84
Diluted	$ (0.32)	$ 0.36	$ (0.53)	$ 0.82
Completion And Remedial Services [Member]
Revenues:
Total revenues	132,216	156,560	250,577	320,980
Expenses:
Depreciation and amortization	15,753	13,644	30,815	26,495
Total expenses	85,847	93,098	164,854	190,123
Fluid Services [Member]
Revenues:
Total revenues	85,601	90,592	169,931	185,917
Expenses:
Depreciation and amortization	14,818	12,530	28,985	24,326
Total expenses	59,296	58,221	117,171	121,068
Well Servicing [Member]
Revenues:
Total revenues	93,921	98,723	181,596	194,625
Expenses:
Depreciation and amortization	15,568	14,574	30,452	28,915
Total expenses	67,600	71,864	132,603	139,114
Contract Drilling
Revenues:
Total revenues	13,985	15,643	27,970	30,893
Expenses:
Total expenses	$ 9,769	$ 9,831	$ 18,932	$ 20,037