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Summary of Significant Accounting Policies - Debt (Details) (Senior Notes [Member], USD $)	Feb. 28, 2014 Unsecured Senior Notes Due March 31, 2018 [Member]	Feb. 28, 2013 Unsecured Senior Notes Due March 31, 2018 [Member]	Jan. 21, 2011 Unsecured Senior Notes Due January 2021 [Member]
Debt Instrument [Line Items]
Fair value of notes	$ 222,200,000	$ 224,100,000
Debt Instrument, Annual Principal Payment	14,300,000
Debt instrument, face amount	$ 100,000,000		$ 125,000,000

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 notes payable as of the balance sheet date.

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