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STOCKHOLDERS' EQUITY (Narrative) (Details) - USD ($) |  | 1 Months Ended | 2 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
May 18, 2016 | Dec. 31, 2018 | Jul. 31, 2016 | Dec. 31, 2018 | Dec. 30, 2018 | Dec. 31, 2017 | Dec. 25, 2016 | Oct. 31, 2018 | Feb. 10, 2016 | Jul. 28, 2015
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |
Share repurchase, authorized amount |  |  |  |  |  |  |  | $ 200,000,000.0 | $ 300,000,000.0 | $ 150,000,000.0
Shares repurchased under program (in shares) |  |  |  | 15,600 |  |  |  |  |  |
Market value of shares repurchased under program |  |  |  | $ 200,000 | $ 236,000 | $ 14,641,000 | $ 117,884,000 |  |  |
Special cash dividends | $ 700,000,000 |  |  |  |  |  |  |  |  |
Special cash dividends paid (in dollars per share) | $ 2.75 |  |  |  |  |  |  |  |  |
Capital contributions to subsidiary by noncontrolling participants |  | $ 1,400,000 | $ 7,300,000 |  | $ 1,421,000 |  | $ 7,252,000 |  |  |
Consolidation, eliminations |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |
Additional capital contributed to subsidiary |  | $ 600,000 | $ 2,700,000 |  |  |  |  |  |  |

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