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SHAREHOLDERS' DEFICIT - Share Repurchase Program (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Oct. 30, 2015 | Aug. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Feb. 28, 2017
Share Repurchase Program |  |  |  |  |  |
Value of shares repurchased and retired |  |  | $ 97,500 | $ 78,094 | $ 25,636 |
Common Stock |  |  |  |  |  |
Share Repurchase Program |  |  |  |  |  |
Number of shares repurchased and retired |  |  | 7,430,000 | 7,201,000 | 2,676,000 |
Value of shares repurchased and retired |  |  | $ 75 | $ 72 | $ 27 |
2017 Capital Return Plan |  |  |  |  |  |
Share Repurchase Program |  |  |  |  |  |
Amount approved under share repurchase program |  |  |  |  |  | $ 150,000
2017 Capital Return Plan | Common Stock |  |  |  |  |  |
Share Repurchase Program |  |  |  |  |  |
Number of shares repurchased and retired |  | 1,317,771 |  |  |  |
Value of shares repurchased and retired |  | $ 17,500 |  |  |  |
ASR Plan | Common Stock |  |  |  |  |  |
Share Repurchase Program |  |  |  |  |  |
Number of shares repurchased and retired |  |  | 6,112,000 |  |  |
Value of shares repurchased and retired |  |  | $ 80,000 |  |  |
Average repurchase price per share |  |  | $ 13.09 |  |  |
2016 Share Repurchase Program | Common Stock |  |  |  |  |  |
Share Repurchase Program |  |  |  |  |  |
Number of shares repurchased and retired |  |  |  | 7,201,000 | 100,000 |
Value of shares repurchased and retired |  |  |  | $ 78,095 | $ 995 |
Average repurchase price per share |  |  |  | $ 10.84 | $ 9.95 |
October 2015 TO | Common Stock |  |  |  |  |  |
Share Repurchase Program |  |  |  |  |  |
Number of shares repurchased and retired |  |  |  |  | 2,576,000 |
Value of shares repurchased and retired |  |  |  |  | $ 24,641 |
Average repurchase price per share |  |  |  |  | $ 9.56 |
Minimum | October 2015 TO | Common Stock |  |  |  |  |  |
Share Repurchase Program |  |  |  |  |  |
Price per share under share repurchase program | $ 8.50 |  |  |  |  |
Maximum | October 2015 TO | Common Stock |  |  |  |  |  |
Share Repurchase Program |  |  |  |  |  |
Amount approved under share repurchase program | $ 75,000 |  |  |  |  |
Price per share under share repurchase program | $ 9.25 |  |  |  |  |

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