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Supplemental Information (Details 5) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Unrealized (gains) losses on available-for-sale securities that were reclassified from net income    
Investment income (loss) $ 79,421 $ 20,252
Interest expense 60,008 62,654
General and administrative expenses 132,545 136,346
Income (loss) from continuing operations before income taxes 109,194 212,412
Income tax expense (benefit) 11,272 69,044
Net income (loss) attributable to Nabors 99,121 134,090
Unrealized (gains) losses on available-for-sale securities | Reclassification adjustment for (gains)/losses included in net income (loss)
   
Unrealized (gains) losses on available-for-sale securities that were reclassified from net income    
Investment income (loss) (75,974) (12,465)
Interest expense (153) (191)
General and administrative expenses (281) (260)
Income (loss) from continuing operations before income taxes (75,540) (12,014)
Income tax expense (benefit) 284 3,749
Net income (loss) attributable to Nabors $ (75,256) $ (8,265)