Amount of the total principal payments made during the annual reporting period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

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No definition available.

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Fair value portion of notes payable.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19,20,22)
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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