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SHAREHOLDERS’ EQUITY - Summary (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 7 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 23, 2016 | Dec. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | May 31, 2016
Equity [Abstract] |  |  |  |  |
Number of shares repurchased and retired (shares) | 127,435 | 2,518,000 | 1,927,000 | 376,000 | 2,152,000
Cost of shares repurchased, including commissions |  | $ 178,165 | $ 212,196 | $ 34,811 | $ 135,954
Average cost per share (USD per share) |  | $ 70.77 | $ 110.11 | $ 92.51 | $ 63.17

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