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

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- Definition

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

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- Definition

Amount of stock repurchase plan authorized.

+ References

No definition available.

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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 S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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-Name Accounting Standards Codification
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
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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

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-Name Accounting Standards Codification
-Topic 505
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-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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Stockholders' Equity (Details) - USD ($)			3 Months Ended		82 Months Ended	125 Months Ended	141 Months Ended
Stockholders' Equity (Details) - USD ($)	Nov. 09, 2016	May 24, 2016	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2017	Mar. 31, 2017	Jun. 02, 2016	May 19, 2015
Schedule of Shareholders' Equity [Line Items]
Stock repurchased during period (in shares)			198,928	146,284			11,989,822
Aggregate price of shares repurchased since inception			$ 6,863,113	$ 3,455,501			$ 149,219,902
Average price of shares repurchased since inception (per share)			$ 34.50	$ 23.62			$ 12.45
Cash dividends declared per common share			$ 0	$ 0
Dividend Declared [Member]
Schedule of Shareholders' Equity [Line Items]
Cash dividends declared per common share	$ 0.13	$ 0.11
2010 Stock Repurchase Program [Member]
Schedule of Shareholders' Equity [Line Items]
Stock repurchase program amount authorized (in shares)								2,000,000.0	5,700,000.0
Stock Repurchase Program, Authorized Amount		$ 25,000,000						$ 25,000,000
Stock repurchased during period (in shares)			6,100	0	3,840,919
Aggregate price of shares repurchased since inception			$ 195,993	$ 0	$ 61,144,453
Average price of shares repurchased since inception (per share)			$ 32.13	$ 0.00	$ 15.92
2005 401(k) Stock Repurchase Program [Member]
Schedule of Shareholders' Equity [Line Items]
Stock repurchased during period (in shares)			176,429	138,680			6,258,872
Aggregate price of shares repurchased since inception			$ 6,107,515	$ 3,275,139			$ 71,852,235
Average price of shares repurchased since inception (per share)			$ 34.62	$ 23.62			$ 11.48
2006 Director and Officer Repurchase Program [Member]
Schedule of Shareholders' Equity [Line Items]
Stock repurchased during period (in shares)			16,399	7,604		1,890,031
Aggregate price of shares repurchased since inception			$ 559,605	$ 180,362		$ 16,223,214
Average price of shares repurchased since inception (per share)			$ 34.12	$ 23.72		$ 8.58