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Discontinued Operations (Tables)
9 Months Ended
Sep. 30, 2012
Discontinued Operations [Abstract]  
Results Of Discontinued Operations
   
For the Three Month
   
For the Nine Month
 
   
Period Ended September 30,
   
Period Ended September 30,
 
   
2012
   
2011
   
2012
   
2011
 
Revenues and other income:
                       
Oil and gas drilling services
  $ 27,260     $ 35,984     $ 95,674     $ 98,593  
Investment and other income
    466       471       4,582       2,822  
      27,726        36,455       100,256       101,415  
Expenses:
                               
Direct operating expenses – oil and
                               
  gas drilling services
    23,467       26,381       79,143       71,016  
Interest
    24       26       77       119  
Salaries and incentive compensation
    558       1,206       2,813       3,889  
Depreciation and amortization
    4,599       5,218       14,740       15,801  
Selling, general and other expenses
    2,369       1,680       8,152       7,822  
      31,017       34,511       104,925       98,647  
Income (loss) from discontinued
                               
  operations before income taxes
    (3,291 )     1,944       (4,669 )     2,768  
Income tax provision (benefit)
    357       254       (1,638 )     (65 )
Income (loss) from discontinued
                               
  operations after income taxes
  $ (3,648 )   $ 1,690     $ (3,031 )   $ 2,833