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Common Stock Cash Dividend (Details) - USD ($) |  | 3 Months Ended
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Sep. 11, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018
Common Stock Cash Dividend |  |  |  |  |  |  |
Quarterly cash dividend declared (in dollars per share) | $ 0.45 |  |  |  |  |  |
Cash dividend declared | $ 8,942,000 | $ 8,942,000 | $ 8,922,000 | $ 8,832,000 | $ 8,694,000 | $ 8,652,000 | $ 8,581,000

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- Definition Aggregate dividends declared 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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- Definition Amount of paid and unpaid common stock dividends declared with the form of settlement in cash. + 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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