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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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Aggregate dividends paid during the period for each share of common stock outstanding.

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