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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Common Stock Repurchases and Common Stock Dividend) (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of shares repurchased |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,435 | $ 53,731 | $ 80,761
Common stock dividends declared |  | $ 0.13 | $ 0.13 | $ 0.13 | $ 0.13 | $ 0.12 | $ 0.12 | $ 0.12 | $ 0.12 | $ 0.12 | $ 0.12 | $ 0.10 | $ 0.10 |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchase Authorization Increase Value |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 60,000 | $ 75,000
Number of shares repurchased |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.1 | 1.3 | 1.6
Cost of shares repurchased |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,400 | $ 53,700 | $ 80,800
Remaining authorized repurchase amount |  | $ 23,600 |  |  |  |  |  |  |  |  |  |  |  | $ 23,600 |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock dividends declared, payable 1st quarter 2016 | $ 0.14 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock dividends declared, payable 2nd quarter 2016 | 0.14 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock dividends declared, payable 3rd quarter 2016 | 0.14 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock dividends declared, payable 4th quarter 2016 | $ 0.14 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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