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Summary of Significant Accounting Policies - Debt (Details) - Senior Notes [Member] - USD ($) | Feb. 28, 2017 | Feb. 29, 2016 | Jan. 21, 2011
--- | --- | --- | ---
Unsecured Senior Notes Due March 31, 2018 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Fair value of notes | $ 144,351,000 | $ 154,665,000 |
Debt Instrument, Annual Principal Payment | 14,300,000 |  |
Debt instrument, face amount | $ 100,000,000 |  |
Unsecured Senior Notes Due January 2021 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, face amount |  |  | $ 125,000,000

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