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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
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