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BASIS OF PRESENTATION - Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018 | Jan. 01, 2018
Recent accounting pronouncements |  |  |
Accumulated other comprehensive income | $ (2,514) | $ (1,609) |
Retained earnings | 554,363 | 563,593 |
ASU 2016-01 |  |  |
Recent accounting pronouncements |  |  |
Equity investments that do not have readily determinable fair values |  |  | $ 20,100
Equity investments |  |  | 600
ASU 2018-15 | Early Adoption |  |  |
Recent accounting pronouncements |  |  |
Capitalized implementation costs | 3,600 | $ 1,200 |
Amortization of implementation costs | $ 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

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