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Common Stock (Details) - USD ($) |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 29, 2019 | Dec. 19, 2018 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared (in dollars per share) |  | $ 0.12 | $ 0.11 | $ 0.11 | $ 0.11 | $ 0.11 | $ 0.10 | $ 0.10 | $ 0.10 | $ 0.10 |  |  |
Dividends paid (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 0.44 | $ 0.40 | $ 0.36
Stock repurchase program, authorized amount |  |  | $ 30,000,000 |  |  |  |  |  |  |  | $ 30,000,000 |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends paid (in dollars per share) | $ 0.12 |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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