Financial Instruments (Details) (TRA Investment [Member], USD $) In Millions, unless otherwise specified	Mar. 31, 2012
TRA Investment [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
TRA investment carrying value	$ 1.7

- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents investments accounted for under the cost method of accounting as of the balance sheet date.

+ References+ Details