Condensed Consolidated Statements of Comprehensive Income (Parenthetical) (unaudited) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2021 |
Mar. 31, 2020 |
|
| Statement of Comprehensive Income [Abstract] | ||
| Tax effect of the unrealized gain on short-term investment securities and cash and cash equivalents | $ 2 | $ 54 |
| Interest rate derivative loss reclassified into earnings, tax | $ 13 | $ 24 |