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SHAREHOLDERS' EQUITY - Share repurchase activities (Details) - Common stocks - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Treasury Shares [Line Items] |  |  |
Total shares (in shares) | 200 | 4,288 | 10,508
Total cost | $ 10,080 | $ 285,858 | $ 571,805
Average price per share (in usd per share) | $ 50.40 | $ 66.67 | $ 54.42
In the open market |  |  |
Treasury Shares [Line Items] |  |  |
Total shares (in shares) | 0 | 3,932 | 10,241
Total cost | $ 0 | $ 261,180 | $ 557,476
Average price per share (in usd per share) | $ 0.00 | $ 66.43 | $ 54.44
From employees |  |  |
Treasury Shares [Line Items] |  |  |
Total shares (in shares) | 200 | 356 | 267
Total cost | $ 10,080 | $ 24,678 | $ 14,329
Average price per share (in usd per share) | $ 50.40 | $ 69.36 | $ 53.74

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