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SHAREHOLDERS' EQUITY (Details 2) - USD ($) $ / shares in Units, $ in Thousands |  |  | 1 Months Ended | 3 Months Ended | 5 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jan. 15, 2016 | Aug. 20, 2015 | Aug. 30, 2015 | Jun. 30, 2017 | Jun. 30, 2016 | Jan. 15, 2016 | Jun. 30, 2017 | Jun. 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) |  |  |  | 2,004,000 | 2,337,000 |  | 4,233,000 | 6,247,000
Total cost |  |  |  | $ 131,070 | $ 127,039 |  | $ 282,313 | $ 323,050
Average price per share (in usd per share) |  |  |  | $ 65.40 | $ 54.36 |  | $ 66.69 | $ 51.71
Common Stock [Member] | In the Open Market [Member] |  |  |  |  |  |  |  |
Treasury Shares [Line Items] |  |  |  |  |  |  |  |
Total shares (in shares) |  |  |  | 1,987,000 | 2,300,000 |  | 3,883,000 | 6,004,000
Total cost |  |  |  | $ 129,960 | $ 125,000 |  | $ 257,943 | $ 310,000
Average price per share (in usd per share) |  |  |  | $ 65.40 | $ 54.35 |  | $ 66.44 | $ 51.63
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) |  |  |  | 17,000 | 37,000 |  | 350,000 | 243,000
Total cost |  |  |  | $ 1,110 | $ 2,039 |  | $ 24,370 | $ 13,050
Average price per share (in usd per share) |  |  |  | $ 64.82 | $ 54.70 |  | $ 69.55 | $ 53.65

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