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Stockholders' Equity (Details) - USD ($) |  |  | 3 Months Ended | 94 Months Ended | 137 Months Ended | 153 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 07, 2017 | May 16, 2017 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2018 | Mar. 31, 2018 | Jun. 02, 2016 | May 24, 2016 | May 19, 2015
Schedule of Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Stock repurchased during period (in shares) |  |  | 133,695 | 198,928 |  |  | 12,446,723 |  |  |
Aggregate price of shares repurchased since inception |  |  | $ 4,938,613 | $ 6,863,113 |  |  | $ 165,525,566 |  |  |
Average price of shares repurchased since inception (per share) |  |  | $ 36.94 | $ 34.50 |  |  | $ 13.30 |  |  |
Dividend Declared |  |  |  |  |  |  |  |  |  |
Schedule of Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Cash dividends declared per common share | $ 0.13 | $ 0.13 |  |  |  |  |  |  |  |
2010 Stock Repurchase Program |  |  |  |  |  |  |  |  |  |
Schedule of Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  |  | $ 25,000,000 | $ 25,000,000 |
Stock repurchase program amount authorized (in shares) |  |  |  |  |  |  |  | 2,000,000.0 |  | 5,700,000.0
Stock repurchased during period (in shares) |  |  | 0 | 6,100 | 3,843,495 |  |  |  |  |
Aggregate price of shares repurchased since inception |  |  | $ 0 | $ 195,993 | $ 61,232,115 |  |  |  |  |
Average price of shares repurchased since inception (per share) |  |  | $ 0.00 | $ 32.13 | $ 15.93 |  |  |  |  |
2005 401(k) Stock Repurchase Program |  |  |  |  |  |  |  |  |  |
Schedule of Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Stock repurchased during period (in shares) |  |  | 118,203 | 176,429 |  |  | 6,668,226 |  |  |
Aggregate price of shares repurchased since inception |  |  | $ 4,378,925 | $ 6,107,515 |  |  | $ 86,447,730 |  |  |
Average price of shares repurchased since inception (per share) |  |  | $ 37.05 | $ 34.62 |  |  | $ 12.96 |  |  |
2006 Director and Officer Repurchase Program |  |  |  |  |  |  |  |  |  |
Schedule of Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Stock repurchased during period (in shares) |  |  | 15,492 | 16,399 |  | 1,935,002 |  |  |  |
Aggregate price of shares repurchased since inception |  |  | $ 559,688 | $ 559,605 |  | $ 17,845,721 |  |  |  |
Average price of shares repurchased since inception (per share) |  |  | $ 36.13 | $ 34.12 |  | $ 9.22 |  |  |  |

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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 + Details
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