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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND PRACTICES - New Accounting Standards - Cumulative Effect at Adoption Date of Applying ASU 2014-09 (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | ---
ASSETS |  |  |
Prepaid expenses and other current assets | $ 19,445 |  | $ 17,950
Inventory | 48,540 |  | 49,703
LIABILITIES AND EQUITY |  |  |
Other accrued liabilities | 95,308 |  | $ 92,472
Adjustments to apply ASC 606 | ASU 2014-09 |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Pre-tax increase to the opening balance of retained earnings |  | $ 8,800 |
Tax impact resulting in reduction to opening balance of retained earnings |  | 2,000 |
ASSETS |  |  |
Prepaid expenses and other current assets | 3,124 | 8,500 |
Inventory |  | (400) |
LIABILITIES AND EQUITY |  |  |
Other accrued liabilities |  | $ (700) |
Without adoption of ASC 606 | ASU 2014-09 |  |  |
ASSETS |  |  |
Prepaid expenses and other current assets | $ 16,321 |  |

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