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Shareholders' Equity (Details) - USD ($) |  |  |  |  | 3 Months Ended | 12 Months Ended | 115 Months Ended | 158 Months Ended | 174 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 08, 2018 | May 18, 2018 | Nov. 07, 2017 | May 16, 2017 | Jun. 30, 2019 | Dec. 31, 2018 | Jun. 30, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2019 | Mar. 05, 2019 | May 16, 2018 | Jun. 02, 2016 | May 19, 2015
Schedule of Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized Repurchase |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 20,000,000 | $ 15,000,000 | $ 25,000,000 |
Stock repurchased during period (in shares) |  |  |  |  |  |  |  | 454,430 | 783,776 | 522,134 |  |  | 13,551,234 |  |  |  |
Aggregate price of shares repurchased since inception |  |  |  |  |  |  |  | $ 20,793,000 | $ 27,943,000 | $ 18,234,000 |  |  | $ 209,315,000 |  |  |  |
Average price of shares repurchased since inception (per share) |  |  |  |  |  |  |  | $ 45.76 | $ 35.65 | $ 34.92 |  |  | $ 15.45 |  |  |  |
Dividends declared (in dollars per share) |  |  |  |  | $ 0.16 | $ 0.16 | $ 0.16 | $ 0.32 | $ 0.32 | $ 0.26 |  |  |  |  |  |  |
Cash dividends paid |  |  |  |  |  |  |  | $ 16,600,000 | $ 16,700,000 | $ 13,700,000 |  |  |  |  |  |  |
Regular Semi-Annual Dividend |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared (in dollars per share) | $ 0.16 | $ 0.16 | $ 0.13 | $ 0.13 |  |  |  |  |  |  |  |  |  |  |  |  |
Open market |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program amount authorized (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,700,000
Stock repurchased during period (in shares) |  |  |  |  |  |  |  | 5,799 | 252,272 | 8,676 | 4,101,566 |  |  |  |  |  |
Aggregate price of shares repurchased since inception |  |  |  |  |  |  |  | $ 200,000 | $ 8,374,000 | $ 284,000 | $ 69,806,000 |  |  |  |  |  |
Average price of shares repurchased since inception (per share) |  |  |  |  |  |  |  | $ 34.46 | $ 33.19 | $ 32.69 | $ 17.02 |  |  |  |  |  |
401(k) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased during period (in shares) |  |  |  |  |  |  |  | 419,963 | 497,753 | 467,580 |  |  | 7,467,739 |  |  |  |
Aggregate price of shares repurchased since inception |  |  |  |  |  |  |  | $ 19,386,000 | $ 18,472,000 | $ 16,336,000 |  |  | $ 119,927,000 |  |  |  |
Average price of shares repurchased since inception (per share) |  |  |  |  |  |  |  | $ 46.16 | $ 37.11 | $ 34.94 |  |  | $ 16.06 |  |  |  |
Directors & employees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased during period (in shares) |  |  |  |  |  |  |  | 28,668 | 33,751 | 45,878 |  | 1,981,929 |  |  |  |  |
Aggregate price of shares repurchased since inception |  |  |  |  |  |  |  | $ 1,207,000 | $ 1,097,000 | $ 1,614,000 |  | $ 19,582,000 |  |  |  |  |
Average price of shares repurchased since inception (per share) |  |  |  |  |  |  |  | $ 42.11 | $ 32.49 | $ 35.19 |  | $ 9.88 |  |  |  |  |

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