Quarterly report pursuant to Section 13 or 15(d)

Asset Impairment

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Asset Impairment
3 Months Ended
Mar. 31, 2012
Asset Impairment [Abstract]  
Asset Impairment
2. Asset Impairment

During the fourth quarter of 2011, in accordance with the impairment or disposal of long-lived assets subsections of ASC 360-10, Property, Plant and Equipment, we recorded a non-cash pre-tax impairment charge of $170.0 million related to our AADU rigs due to the extended construction and commissioning schedule and related costs. The AADU rigs are reported as part of the U.S. Drilling segment.