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BASIS OF PRESENTATION - Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018 | Jun. 30, 2018 | Jan. 01, 2018 | Jan. 01, 2016
Recent accounting pronouncements |  |  |  |  |  |
Equity investments with readily determinable fair values | $ 200 | $ 200 | $ 200 |  |  |
Accumulated other comprehensive income | (1,282) | (1,282) | (1,609) |  |  |
Retained earnings | 555,806 | 555,806 | 563,593 |  |  |
Cumulative effect adjustment due to adoption of new accounting |  |  |  | $ 2,636 |  |
ASU 2016-01 |  |  |  |  |  |
Recent accounting pronouncements |  |  |  |  |  |
Equity investments that do not have readily determinable fair values |  |  |  |  |  | $ 20,100
Equity investments with readily determinable fair values |  |  |  |  |  | 600
ASU 2018-15 | Early Adoption |  |  |  |  |  |
Recent accounting pronouncements |  |  |  |  |  |
Capitalized implementation costs | 2,500 | 2,500 | $ 1,200 |  |  |
Amortization of implementation costs | $ 100 | $ 100 |  |  |  |
Adjustment | ASU 2016-01 |  |  |  |  |  |
Recent accounting pronouncements |  |  |  |  |  |
Accumulated other comprehensive income |  |  |  |  |  | (200)
Retained earnings |  |  |  |  |  | $ 200
Adjustment | ASU 2018-02 | Early Adoption |  |  |  |  |  |
Recent accounting pronouncements |  |  |  |  |  |
Accumulated other comprehensive income |  |  |  |  | $ (800) |
Retained earnings |  |  |  |  | 800 |
Valuation allowance |  |  |  |  | 800 |
Cumulative effect adjustment due to adoption of new accounting |  |  |  |  | $ 0 |

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