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Stockholders' Equity - Cash Dividends Declared to Stockholders (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Per share amount (in usd per share) | $ 0.125 |  |  | $ 0.125 |  |  | $ 0.375 | $ 0.375
Total declared | $ 2,545 | $ 2,553 | $ 2,553 | $ 2,494 | $ 2,491 | $ 2,488 |  |
Common Stock |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Per share amount (in usd per share) |  |  |  |  |  |  | $ 0.375 |
Total declared |  |  |  |  |  |  | $ 7,651 |
Common Stock | Installment One |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Declaration Date |  |  |  |  |  |  | Feb. 17, 2021 |
Record Date |  |  |  |  |  |  | Mar. 16, 2021 |
Payment Date |  |  |  |  |  |  | Mar. 30, 2021 |
Per share amount (in usd per share) |  |  |  |  |  |  | $ 0.125 |
Total declared |  |  |  |  |  |  | $ 2,553 |
Common Stock | Installment Two |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Declaration Date |  |  |  |  |  |  | Apr. 28, 2021 |
Record Date |  |  |  |  |  |  | May 25, 2021 |
Payment Date |  |  |  |  |  |  | Jun. 24, 2021 |
Per share amount (in usd per share) |  |  |  |  |  |  | $ 0.125 |
Total declared |  |  |  |  |  |  | $ 2,553 |
Common Stock | Installment Three |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Declaration Date |  |  |  |  |  |  | Jul. 28, 2021 |
Record Date |  |  |  |  |  |  | Aug. 17, 2021 |
Payment Date |  |  |  |  |  |  | Sep. 10, 2021 |
Per share amount (in usd per share) |  |  |  |  |  |  | $ 0.125 |
Total declared |  |  |  |  |  |  | $ 2,545 |

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- Definition Date the declared dividend will be paid, in YYYY-MM-DD format. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123431023&loc=d3e4304-108586 + Details
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- Definition Amount of paid and unpaid cash dividends declared for classes of stock, for example, but not limited to, common and preferred. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817 Reference 2: 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=120397183&loc=d3e187085-122770 + Details
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