[Line Items] for Schedule of Shareholders' Equity [Table]

No definition available.

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- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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- Definition

The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

+ References

No definition available.

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- Definition

Total cost of shares repurchased divided by the total number of shares repurchased.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655

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- Definition

Number of shares that have been repurchased during the period and are being held in treasury.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30
-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

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- Definition

Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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Stockholders' Equity (Details) - USD ($)			3 Months Ended		70 Months Ended	113 Months Ended	129 Months Ended
Stockholders' Equity (Details) - USD ($)	Oct. 29, 2015	May. 19, 2015	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2016	Mar. 31, 2016
Schedule of Shareholders' Equity [Line Items]
Stock repurchased during period (in shares)			146,284	130,930			11,201,007
Aggregate price of shares repurchased since inception			$ 3,455,501	$ 2,954,650			$ 125,667,723
Average price of shares repurchased since inception (per share)			$ 23.62	$ 22.57			$ 11.22
Cash dividends declared per common share			$ 0	$ 0
Dividend Declared
Schedule of Shareholders' Equity [Line Items]
Cash dividends declared per common share	$ 0.11	$ 0.11
2010 Stock Repurchase Program
Schedule of Shareholders' Equity [Line Items]
Stock repurchase program amount authorized (in shares)		5,700,000
Stock repurchased during period (in shares)			0	0	3,669,221
Aggregate price of shares repurchased since inception			$ 0	$ 0	$ 56,507,802
Average price of shares repurchased since inception (per share)			$ 0.00	$ 0.00	$ 15.40
2005 401(k) Stock Repurchase Program
Schedule of Shareholders' Equity [Line Items]
Stock repurchased during period (in shares)			138,680	128,830			5,680,622
Aggregate price of shares repurchased since inception			$ 3,275,139	$ 2,906,355			$ 54,139,398
Average price of shares repurchased since inception (per share)			$ 23.62	$ 22.56			$ 9.53
2006 Director and Officer Repurchase Program
Schedule of Shareholders' Equity [Line Items]
Stock repurchased during period (in shares)			7,604	2,100		1,851,164
Aggregate price of shares repurchased since inception			$ 180,362	$ 48,295		$ 15,020,523
Average price of shares repurchased since inception (per share)			$ 23.72	$ 23.00		$ 8.11