Recently issued accounting pronouncements	6 Months Ended
Jun. 30, 2011
Recently issued accounting pronouncements
Recently issued accounting pronouncements	16. Recently issued accounting pronouncements In May 2011, the FASB issued an update to the accounting on fair value measurement to provide a consistent definition of fair value and ensure that the fair value measurement and disclosure requirements are similar between U.S. GAAP and International Financial Reporting Standards (“IFRS”). This update changes certain fair value measurement principles and enhances the disclosure requirements for fair value measurements. This update does not extend the use of fair value accounting, but provides guidance on how it should be applied where its use is already required or permitted by other standards within U.S. GAAP or IFRS. This update is effective for interim and annual periods beginning after December 15, 2011 and is applied prospectively. Early adoption is prohibited. We are currently evaluating the impact, if any, of this new accounting update on our consolidated financial statements. In June 2011, the FASB issued an update to the accounting on comprehensive income to increase the prominence of items reported in other comprehensive income and to facilitate convergence of U.S. GAAP and IFRS. This update requires that all non-owner changes in stockholders' equity be presented either in a single continuous statement of comprehensive income or in two separate but consecutive statements. This update does not change the items that must be reported in other comprehensive income or when an item of other comprehensive income must be reclassified to net income. Further, this update does not affect how earnings per share is calculated or presented. This update is effective for interim and annual periods beginning after December 15, 2011 and is applied retrospectively. Early adoption is permitted. We do not expect that the adoption of this guidance will have a material impact on our consolidated financial statements.

Recently issued accounting pronouncements

6 Months Ended

Jun. 30, 2011

Recently issued accounting pronouncements

Recently issued accounting pronouncements

16. Recently issued accounting pronouncements

In May 2011, the FASB issued an update to the accounting on fair value measurement to provide a consistent definition of fair value and ensure that the fair value measurement and disclosure requirements are similar between U.S. GAAP and International Financial Reporting Standards (“IFRS”). This update changes certain fair value measurement principles and enhances the disclosure requirements for fair value measurements. This update does not extend the use of fair value accounting, but provides guidance on how it should be applied where its use is already required or permitted by other standards within U.S. GAAP or IFRS. This update is effective for interim and annual periods beginning after December 15, 2011 and is applied prospectively. Early adoption is prohibited. We are currently evaluating the impact, if any, of this new accounting update on our consolidated financial statements.

In June 2011, the FASB issued an update to the accounting on comprehensive income to increase the prominence of items reported in other comprehensive income and to facilitate convergence of U.S. GAAP and IFRS. This update requires that all non-owner changes in stockholders' equity be presented either in a single continuous statement of comprehensive income or in two separate but consecutive statements. This update does not change the items that must be reported in other comprehensive income or when an item of other comprehensive income must be reclassified to net income. Further, this update does not affect how earnings per share is calculated or presented. This update is effective for interim and annual periods beginning after December 15, 2011 and is applied retrospectively. Early adoption is permitted. We do not expect that the adoption of this guidance will have a material impact on our consolidated financial statements.