Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Revenues:
Total revenues	$ 359,662	$ 325,723	$ 696,418	$ 630,074
Expenses:
General and administrative, including stock-based compensation of $3,733 and $3,312 in three months and $7,121 and $6,129 in the six months ended June 30, 2014 and 2013, respectively	42,953	49,321	82,512	91,278
Depreciation and amortization	51,785	52,067	103,490	101,848
Loss on disposal of assets	916	790	237	1,879
Total expenses	338,584	324,690	661,356	628,565
Operating income	21,078	1,033	35,062	1,509
Other income (expense):
Interest expense	(16,566)	(16,806)	(33,425)	(33,614)
Interest income	13	13	26	30
Other income	107	173	473	335
Income (loss) before income taxes	4,632	(15,587)	2,136	(31,740)
Income tax benefit (expense)	(2,188)	2,790	(1,600)	10,166
Net income (loss)	2,444	(12,797)	536	(21,574)
Earnings per share of common stock:
Basic	$ 0.06	$ (0.32)	$ 0.01	$ (0.53)
Diluted	$ 0.06	$ (0.32)	$ 0.01	$ (0.53)
Completion And Remedial Services [Member]
Revenues:
Total revenues	164,366	132,216	301,851	250,577
Expenses:
Cost of Revenue	102,617	85,847	189,097	164,854
Depreciation and amortization	16,040	15,753	32,044	30,815
Well Servicing [Member]
Revenues:
Total revenues	89,629	93,921	182,541	181,596
Expenses:
Cost of Revenue	64,748	67,600	134,508	132,603
Depreciation and amortization	13,939	15,568	27,848	30,452
Fluid Services [Member]
Revenues:
Total revenues	90,314	85,601	183,149	169,931
Expenses:
Cost of Revenue	65,055	59,296	131,837	117,171
Depreciation and amortization	15,926	14,818	31,851	28,985
Contract Drilling
Revenues:
Total revenues	15,353	13,985	28,877	27,970
Expenses:
Cost of Revenue	$ 10,510	$ 9,769	$ 19,675	$ 18,932