During the fourth quarter of 2011, we evaluated the present value of the future cash flows related to our AADU rigs in accordance with the impairment or disposal of long-lived assets subsections of ASC 360-10, Property, Plant and Equipment. As a result, we recorded a non-cash pre-tax impairment charge of $170.0 million ($109.1 million after tax) due to the extended construction and commissioning schedule and related costs. The AADU rigs are reported as part of the U.S. Drilling segment.