Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenues:
Drilling services	$ 131,033	$ 125,662	$ 402,357	$ 369,014
Production services	112,946	104,111	319,646	322,561
Total revenues	243,979	229,773	722,003	691,575
Costs and expenses:
Drilling services	89,350	88,188	267,630	247,896
Production services	71,910	65,395	202,662	191,774
Depreciation and amortization	47,414	42,067	141,047	120,429
General and administrative	23,896	21,269	70,872	64,677
Bad debt expense (recovery)	35	(368)	453	(515)
Impairment charges	9,504	0	54,292	1,032
Total costs and expenses	242,109	216,551	736,956	625,293
Income (loss) from operations	1,870	13,222	(14,953)	66,282
Other (expense) income:
Interest Expense	12,324	9,453	36,117	26,658
Other	610	307	(1,460)	1,259
Total other expense	(11,714)	(9,146)	(37,577)	(25,399)
Income (loss) before income taxes	(9,844)	4,076	(52,530)	40,883
Income tax benefit (expense)	3,614	(1,461)	19,113	(14,411)
Net income (loss)	$ (6,230)	$ 2,615	$ (33,417)	$ 26,472
Income (loss) per common share - Basic (USD per share)	$ (0.10)	$ 0.04	$ (0.54)	$ 0.43
Income (loss) per common share - Diluted (USD per share)	$ (0.10)	$ 0.04	$ (0.54)	$ 0.42
Weighted average number of shares outstanding - Basic	62,325	61,881	62,158	61,743
Weighted-average number of shares outstanding - Diluted	62,325	62,825	62,158	62,695