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SHAREHOLDERS' EQUITY - Accelerated share repurchase program (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 1 Months Ended | 5 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jan. 15, 2016 | Aug. 20, 2015 | Aug. 31, 2015 | Jan. 15, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Treasury Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Total cost |  |  |  |  | $ 285,858 | $ 571,805 | $ 264,538
Additional paid-in capital |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Total cost |  |  |  |  | $ 0 | $ (60,000) | $ 60,000
Accelerated Share Repurchase Agreement August 17 2015 |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Total cost |  |  | $ 300,000 |  |  |  |
Total shares (in shares) | 1,358,380 | 4,149,378 | 4,149,378 | 5,507,758 |  | 1,358,380 | 4,149,378
Accelerated Share Repurchases, initial repurchase percentage |  |  | 80.00% |  |  |  |
Average price per share (in usd per share) |  |  |  | $ 54.47 |  |  |
Accelerated Share Repurchase Agreement August 17 2015 | Treasury Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Total cost | $ 60,000 |  |  |  |  |  | $ 240,000
Accelerated Share Repurchase Agreement August 17 2015 | Additional paid-in capital |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Total cost |  |  |  |  |  |  | $ 60,000

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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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- Definition Number of shares that have been repurchased during the period and are being held in treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 + Details
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