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Subsequent Event	12 Months Ended
Subsequent Event	Dec. 31, 2012
Subsequent Event	17. Subsequent Event In February 2013, we announced that one of our mid-water floaters, the Ocean Patriot, will undergo enhancements to enable the rig to work in the North Sea at an estimated aggregate cost of approximately $120 million. We expect the enhancement project to begin during the third quarter of 2013 with completion expected in early 2014.