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Consolidated Balance Sheet (Parenthetical) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Shares, shares outstanding	252,639	262,415
Ordinary shares, shares outstanding	252,352	252,275
Treasury stock, shares	287	10,140
Noble-Cayman [Member]
Ordinary shares, shares outstanding	261,246	261,246

Total number of shares of common stock held by shareholders. May be all or portion of the number of common shares authorized. These shares represent the ownership interest of the common shareholders. Shares outstanding equals shares issued minus shares held in treasury and other adjustments, if any.

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