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COMMON STOCK REPURCHASES AND CASH DIVIDENDS (Cash Dividends) (Details) | 1 Months Ended | 3 Months Ended | 12 Months Ended
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Jan. 31, 2021 item $ / shares | Jul. 31, 2020 item $ / shares | Apr. 30, 2020 USD ($) $ / shares | Oct. 31, 2019 item $ / shares | Jan. 31, 2019 item $ / shares | Jan. 31, 2018 $ / shares | Dec. 31, 2020 $ / shares | Sep. 30, 2020 $ / shares | Jun. 30, 2020 $ / shares | Mar. 31, 2020 $ / shares | Dec. 31, 2019 $ / shares | Sep. 30, 2019 $ / shares | Jun. 30, 2019 $ / shares | Mar. 31, 2019 $ / shares | Dec. 31, 2018 $ / shares | Sep. 30, 2018 $ / shares | Jun. 30, 2018 $ / shares | Mar. 31, 2018 $ / shares | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Dividends Declared and Paid [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared |  |  |  | $ 0.095 | $ 0.085 | $ 0.080 | $ 0.110 | $ 0.110 | $ 0.105 | $ 0.095 | $ 0.095 | $ 0.085 | $ 0.085 | $ 0.085 | $ 0.080 | $ 0.080 | $ 0.080 | $ 0.080 |  |  |
Payments of Dividends | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25,081,000 | $ 20,506,000 | $ 18,823,000
Common Stock, Dividends, Per Share, Declared, Current Fiscal Year, Each Quarter |  |  |  | $ 0.095 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Number of Distributions Declared |  | 2 | 3 | 5 | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional Common Stock, Dividends, Per Share, Declared, Current Fiscal Year, Fourth Quarter |  |  |  | $ 0.01 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends Per Share Declared, Current Fiscal Year, Fourth Quarter |  | $ 0.11 |  |  | $ 0.085 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends Per Share Declared, Current Fiscal Year, Second Quarter |  |  | $ 0.105 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Declared and Paid [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Number of Distributions Declared | item | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared, Next Fiscal Year, Each Quarter | $ 0.13 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared, Cash Dividend Again Next Fiscal Year | $ 0.02 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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