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SHAREHOLDERS' EQUITY (Details 2) - USD ($) $ / shares in Units, $ in Thousands |  |  | 1 Months Ended | 3 Months Ended | 5 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jan. 15, 2016 | Aug. 20, 2015 | Aug. 30, 2015 | Sep. 30, 2017 | Sep. 30, 2016 | Jan. 15, 2016 | Sep. 30, 2017 | Sep. 30, 2016
August 17, 2015 ASR agreement [Member] |  |  |  |  |  |  |  |
Treasury Shares [Line Items] |  |  |  |  |  |  |  |
Total shares (in shares) | 1,358,380.00 | 4,149,378 | 4,149,378 |  |  | 5,507,758 |  |
Total cost |  |  | $ 300,000 |  |  |  |  |
Average price per share (in usd per share) |  |  |  |  |  | $ 54.47 |  |
Common Stock [Member] |  |  |  |  |  |  |  |
Treasury Shares [Line Items] |  |  |  |  |  |  |  |
Total shares (in shares) |  |  |  | 51,000 | 2,252,000 |  | 4,284,000 | 8,499,000
Total cost |  |  |  | $ 3,347 | $ 126,036 |  | $ 285,659 | $ 449,085
Average price per share (in usd per share) |  |  |  | $ 65.74 | $ 55.98 |  | $ 66.68 | $ 52.84
Common Stock [Member] | In the Open Market [Member] |  |  |  |  |  |  |  |
Treasury Shares [Line Items] |  |  |  |  |  |  |  |
Total shares (in shares) |  |  |  | 49,000 | 2,232,000 |  | 3,932,000 | 8,236,000
Total cost |  |  |  | $ 3,237 | $ 124,948 |  | $ 261,180 | $ 434,948
Average price per share (in usd per share) |  |  |  | $ 65.80 | $ 56.00 |  | $ 66.43 | $ 52.81
Common Stock [Member] | In the Open Market [Member] | August 17, 2015 ASR agreement [Member] |  |  |  |  |  |  |  |
Treasury Shares [Line Items] |  |  |  |  |  |  |  |
Total shares (in shares) |  |  |  |  |  |  |  | 1,358,380
Common Stock [Member] | From Employees [Member] |  |  |  |  |  |  |  |
Treasury Shares [Line Items] |  |  |  |  |  |  |  |
Total shares (in shares) |  |  |  | 2,000 | 20,000 |  | 352,000 | 263,000
Total cost |  |  |  | $ 110 | $ 1,088 |  | $ 24,479 | $ 14,137
Average price per share (in usd per share) |  |  |  | $ 64.04 | $ 54.13 |  | $ 69.53 | $ 53.68

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