Quarterly report pursuant to Section 13 or 15(d)

Reportable Segments (Details)

v2.4.0.6
Reportable Segments (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Revenues:          
Revenues $ 178,925 $ 172,812 $ 355,494 $ 328,991  
Operating gross margin:          
Total operating gross margin 46,440 40,797 100,458 62,001 11,700
Operations by Reportable Industry Segment          
General and administration expense (7,420) (7,948) (12,917) (14,752)  
Gain on disposition of assets, net 1,368 366 1,860 1,370  
Total operating income 40,388 33,215 89,401 48,619  
Interest expense (8,925) (5,755) (16,962) (11,616)  
Interest income 53 133 79 179  
Loss on extinguishment of debt (1,649)   (1,649)    
Change in fair value of derivative positions 38 (137) (11) (137)  
Other 20 123 36 134  
Income before income taxes 29,925 27,579 70,894 37,179  
Rental Tools [Member]
          
Revenues:          
Revenues 65,002 58,490 131,286 110,809  
Operating gross margin:          
Total operating gross margin 31,251 30,566 64,853 54,664  
US Barge Drilling [Member]
          
Revenues:          
Revenues 33,292 26,060 61,127 41,980  
Operating gross margin:          
Total operating gross margin 11,014 4,451 18,171 1,769  
US Drilling Segment [Member]
          
Revenues:          
Revenues              
Operating gross margin:          
Total operating gross margin (1,623) (340) (3,170) (681)  
International Drilling [Member]
          
Revenues:          
Revenues 76,923 79,725 155,673 149,661  
Operating gross margin:          
Total operating gross margin 6,056 2,816 20,615 2,123  
Technical Services [Member]
          
Revenues:          
Revenues 3,708 8,537 7,408 16,903  
Operating gross margin:          
Total operating gross margin (258) 1,789 (11) 3,355  
Construction Contract [Member]
          
Revenues:          
Revenues       9,638  
Operating gross margin:          
Total operating gross margin   $ 1,515   $ 771