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Stockholders' Equity (Details) - USD ($) |  |  |  | 3 Months Ended | 6 Months Ended | 97 Months Ended | 140 Months Ended | 156 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 18, 2018 | Nov. 07, 2017 | May 16, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2018 | Jun. 30, 2018 | May 15, 2018 | Jun. 02, 2016 | May 24, 2016 | May 19, 2015
Schedule of Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased during period (in shares) |  |  |  |  |  | 358,682 | 296,885 |  |  | 12,671,710 |  |  |  |
Aggregate price of shares repurchased since inception |  |  |  |  |  | $ 12,346,574 | $ 10,433,710 |  |  | $ 172,925,527 |  |  |  |
Average price of shares repurchased since inception (per share) |  |  |  |  |  | $ 34.42 | $ 35.14 |  |  | $ 13.65 |  |  |  |
Cash dividends declared per common share: |  |  |  | $ 0.16 | $ 0.13 | $ 0.16 | $ 0.13 |  |  |  |  |  |  |
Dividend Declared |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared per common share: | $ 0.16 | $ 0.13 | $ 0.13 |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  | $ 15,000,000.0 | $ 25,000,000.0 | $ 25,000,000.0 |
Stock repurchased during period (in shares) |  |  |  |  |  | 104,155 | 8,676 | 3,947,650 |  |  |  |  |  |
Aggregate price of shares repurchased since inception |  |  |  |  |  | $ 3,427,879 | $ 283,654 | $ 64,659,994 |  |  |  |  |  |
Average price of shares repurchased since inception (per share) |  |  |  |  |  | $ 32.91 | $ 32.69 | $ 16.38 |  |  |  |  |  |
2005 401(k) Stock Repurchase Program |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased during period (in shares) |  |  |  |  |  | 231,387 | 258,051 |  |  | 6,781,410 |  |  |  |
Aggregate price of shares repurchased since inception |  |  |  |  |  | $ 8,108,190 | $ 9,083,606 |  |  | $ 90,176,995 |  |  |  |
Average price of shares repurchased since inception (per share) |  |  |  |  |  | $ 35.04 | $ 35.20 |  |  | $ 13.30 |  |  |  |
2006 Director and Officer Repurchase Program |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased during period (in shares) |  |  |  |  |  | 23,140 | 30,158 |  | 1,942,650 |  |  |  |  |
Aggregate price of shares repurchased since inception |  |  |  |  |  | $ 810,505 | $ 1,066,450 |  | $ 18,088,538 |  |  |  |  |
Average price of shares repurchased since inception (per share) |  |  |  |  |  | $ 35.03 | $ 35.36 |  | $ 9.31 |  |  |  |  |

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