Issuances of Additional Beneficial Certificate Units Level 1 (Notes)

3 Months Ended

Mar. 31, 2013

Issuances of Additional Beneficial Unit Certificates [Abstract]

Unusual or Infrequent Items Disclosure [Text Block]

13. Issuances of Additional Beneficial Unit Certificates

In May 2012, the Partnership issued an additional 12,650,000 BUCs through an underwritten public offering at a public offering price of $5.06 per BUC pursuant to an existing Registration Statement on Form S-3. Net proceeds realized by the Partnership from this issuance of these BUCs were approximately $60 million after payment of an underwriter's discount and other offering costs of approximately $4.0 million.