Recently Issued Accounting Pronouncements	12 Months Ended
Dec. 31, 2011
Recently Issued Accounting Pronouncements [Abstract]
Description of New Accounting Pronouncements Adopted and Not yet Adopted [Text Block]	Recently Issued Accounting Pronouncements In May 2011, the FASB issued ASU 2011-04, Fair Value Measurement: Amendments to Achieve Common Fair Value Measurements and Disclosures. The ASU is a result of joint efforts by the FASB and the International Accounting Standards Board ("IASB") to develop a single, converged fair value framework that addresses how to measure fair value and the disclosures to be provided. The ASU expands existing disclosure requirements for fair value measurements and makes other amendments. The ASU is effective for interim and annual periods beginning after December 15, 2011. In December 2011, the FASB issued ASU 2011-11, which contains new disclosure requirements regarding the nature of an entity's rights of offset and related arrangements associated with its financial instruments and derivative instruments. The new disclosure requirements are effective for annual reporting periods beginning on or after January 1, 2013 and the interim periods therein; retrospective application is required. In December 2011, the FASB issued ASU 2011-10, which addresses whether the guidance on real estate sales applies to derecognition events involving subsidiaries that are in-substance real estate. For public entities, the ASU's amendments are effective prospectively for fiscal years and interim periods within those years beginning on or after June 15, 2012. Early adoption is permitted.

Recently Issued Accounting Pronouncements

In May 2011, the FASB issued ASU 2011-04, Fair Value Measurement: Amendments to Achieve Common Fair Value Measurements and Disclosures. The ASU is a result of joint efforts by the FASB and the International Accounting Standards Board ("IASB") to develop a single, converged fair value framework that addresses how to measure fair value and the disclosures to be provided. The ASU expands existing disclosure requirements for fair value measurements and makes other amendments. The ASU is effective for interim and annual periods beginning after December 15, 2011.

In December 2011, the FASB issued ASU 2011-11, which contains new disclosure requirements regarding the nature of an entity's rights of offset and related arrangements associated with its financial instruments and derivative instruments. The new disclosure requirements are effective for annual reporting periods beginning on or after January 1, 2013 and the interim periods therein; retrospective application is required.

In December 2011, the FASB issued ASU 2011-10, which addresses whether the guidance on real estate sales applies to derecognition events involving subsidiaries that are in-substance real estate. For public entities, the ASU's amendments are effective prospectively for fiscal years and interim periods within those years beginning on or after June 15, 2012. Early adoption is permitted.