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Consolidated Statements Of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Revenues:                      
Drilling services                 $ 498,867 $ 433,902 $ 312,196
Production services                 420,576 282,039 175,014
Total revenues 227,868 229,773 229,824 231,978 203,656 187,651 171,285 153,349 919,443 715,941 487,210
Costs and expenses:                      
Drilling services                 333,846 292,559 227,136
Production services                 252,775 164,365 105,295
Depreciation and amortization                 164,717 132,832 120,811
General and administrative                 85,603 67,318 52,047
Bad debt expense (recovery)                 (440) 925 493
Impairment of equipment                 1,131 484 0
Total costs and expenses                 837,632 658,483 505,782
Income (loss) from operations 15,529 13,222 23,312 29,748 20,297 19,324 11,918 5,919 81,811 57,458 (18,572)
Other (expense) income:                      
Interest expense                 (37,049) (29,721) (26,567)
Impairment of investments                 0 0 (3,331)
Other                 1,624 (6,904) 912
Total other expense                 (35,425) (36,625) (28,986)
Income (loss) before income taxes                 46,386 20,833 (47,558)
Income tax (expense) benefit (1,943) (1,461) (5,997) (6,953) (5,469) (5,250) (1,039) 2,102 (16,354) (9,656) 14,297
Net income (loss) $ 3,560 $ 2,615 $ 9,685 $ 14,172 $ 6,818 $ 6,744 $ 3,650 $ (6,035) $ 30,032 $ 11,177 $ (33,261)
Income (loss) per common share - Basic (USD per share) $ 0.06 $ 0.04 $ 0.16 $ 0.23 $ 0.11 $ 0.11 $ 0.07 $ (0.11) $ 0.49 $ 0.19 $ (0.62)
Income (loss) per common share - Diluted (USD per share) $ 0.06 $ 0.04 $ 0.15 $ 0.23 $ 0.11 $ 0.11 $ 0.07 $ (0.11) $ 0.48 $ 0.19 $ (0.62)
Weighted average number of shares outstanding - Basic                 61,780 57,390 53,797
Weighted-average number of shares outstanding - Diluted                 62,762 58,779 53,797