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Stockholders' Equity (Details) - USD ($) |  |  |  | 3 Months Ended | 6 Months Ended | 85 Months Ended | 128 Months Ended | 144 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 16, 2017 | Nov. 09, 2016 | May 24, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2017 | Jun. 30, 2017 | Jun. 02, 2016 | May 19, 2015
Schedule of Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased during period (in shares) |  |  |  |  |  | 296,885 | 301,505 |  |  | 12,087,779 |  |
Aggregate price of shares repurchased since inception |  |  |  |  |  | $ 10,433,710 | $ 7,673,623 |  |  | $ 152,778,500 |  |
Average price of shares repurchased since inception (per share) |  |  |  |  |  | $ 35.14 | $ 25.45 |  |  | $ 12.64 |  |
Cash dividends declared per common share |  |  |  | $ 0.13 | $ 0.11 | $ 0.13 | $ 0.11 |  |  |  |  |
Dividend Declared |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared per common share | $ 0.13 | $ 0.13 | $ 0.11 |  |  |  |  |  |  |  |  |
2010 Stock Repurchase Program |  |  |  |  |  |  |  |  |  |  |  |
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) |  |  |  |  |  | 8,676 | 10,230 | 3,843,495 |  |  |  |
Aggregate price of shares repurchased since inception |  |  |  |  |  | $ 283,654 | $ 265,402 | $ 61,232,115 |  |  |  |
Average price of shares repurchased since inception (per share) |  |  |  |  |  | $ 32.69 | $ 25.94 | $ 15.93 |  |  |  |
2005 401(k) Stock Repurchase Program |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased during period (in shares) |  |  |  |  |  | 258,051 | 274,147 |  |  | 6,340,494 |  |
Aggregate price of shares repurchased since inception |  |  |  |  |  | $ 9,083,606 | $ 6,967,393 |  |  | $ 74,816,326 |  |
Average price of shares repurchased since inception (per share) |  |  |  |  |  | $ 35.20 | $ 25.41 |  |  | $ 11.80 |  |
2006 Director and Officer Repurchase Program |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased during period (in shares) |  |  |  |  |  | 30,158 | 17,128 |  | 1,903,790 |  |  |
Aggregate price of shares repurchased since inception |  |  |  |  |  | $ 1,066,450 | $ 440,828 |  | $ 16,730,059 |  |  |
Average price of shares repurchased since inception (per share) |  |  |  |  |  | $ 35.36 | $ 25.74 |  | $ 8.79 |  |  |

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