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SHAREHOLDERS' EQUITY (Details 3) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  | 1 Months Ended | 5 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 17, 2017 | Jan. 15, 2016 | Dec. 31, 2015 | Aug. 20, 2015 | Aug. 30, 2015 | Jan. 15, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016 | Aug. 17, 2015
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred shares |  |  |  |  |  |  | $ 775,000 |  | $ 1,126,074 |
Treasury shares, at cost [Member] |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Total cost |  |  |  |  |  |  | 285,659 | $ 449,086 |  |
Additional paid-in capital [Member] |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Total cost |  |  |  |  |  |  | $ 0 | $ (60,000) |  |
August 17, 2015 ASR agreement [Member] |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Accelerated share repurchases, authorized amount |  |  |  |  |  |  |  |  |  | $ 300,000
Total cost |  |  |  |  | $ 300,000 |  |  |  |  |
Total shares (in shares) |  | 1,358,380.00 |  | 4,149,378 | 4,149,378 | 5,507,758 |  |  |  |
Accelerated Share Repurchases, initial repurchase percentage |  |  |  |  | 80.00% |  |  |  |  |
Average price per share (in usd per share) |  |  |  |  |  | $ 54.47 |  |  |  |
August 17, 2015 ASR agreement [Member] | Treasury shares, at cost [Member] |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Total cost |  | $ 60,000 | $ 240,000 |  |  |  |  |  |  |
August 17, 2015 ASR agreement [Member] | Additional paid-in capital [Member] |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Total cost |  |  | $ 60,000 |  |  |  |  |  |  |
Series C Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred stock, shares outstanding (in shares) | 14,042,955 |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage | 6.875% |  |  |  |  |  |  |  |  |
Preferred shares | $ 351,000 |  |  |  |  |  |  |  |  |

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