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COMMON STOCK REPURCHASES AND CASH DIVIDENDS Cash Dividends (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
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Jan. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Dividends Declared and Paid [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared |  | $ 0.16 | $ 0.16 | $ 0.16 | $ 0.16 | $ 0.14 | $ 0.14 | $ 0.14 | $ 0.14 | $ 0.13 | $ 0.13 | $ 0.13 | $ 0.13 |  |  |
Payments of Dividends |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 18,823 | $ 16,634 | $ 15,054
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Declared and Paid [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock Dividends Declared, Per Share, Payable 1st Quarter 2019 | $ 0.17 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock Dividends Declared, Per Share, Payable 2nd Quarter 2019 | 0.17 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock Dividends Declared, Per Share, Payable 3rd Quarter 2019 | 0.17 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock Dividends Declared, Per Share, Payable 4th Quarter 2019 | $ 0.17 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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