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BASIS OF PRESENTATION - Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Jan. 01, 2018 | Dec. 31, 2017 | Jan. 01, 2017
Recent accounting pronouncements |  |  |  |  |
Equity investments with readily determinable fair values | $ 500 |  |  |  |
Additional paid-in capital | 170,069 |  |  | $ 167,973 |
Accumulated other comprehensive income | 2,649 |  |  | 3,746 |
Retained earnings | 546,368 |  |  | $ 552,948 |
Net cash provided by operating activities | 22,544 | $ 32,089 |  |  |
Net cash used in investing activities | (7,077) | (22,622) |  |  |
Net cash used in financing activities | (18,130) | (15,628) |  |  |
Effect of foreign currency exchange rates on total cash | (31) | 207 |  |  |
Net change in cash, cash equivalents, and restricted cash | (2,694) | (5,954) |  |  |
Total cash, cash equivalents, and restricted cash, beginning of period | 219,890 | 288,358 |  |  |
Total cash, cash equivalents, and restricted cash, end of period | 217,196 | 282,404 |  |  |
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 | 500 |  |  |  |
Adjustment | ASU 2016-01 |  |  |  |  |
Recent accounting pronouncements |  |  |  |  |
Accumulated other comprehensive income |  |  | $ (200) |  |
Retained earnings |  |  | $ 200 |  |
Adjustment | ASU 2016-09 |  |  |  |  |
Recent accounting pronouncements |  |  |  |  |
Additional paid-in capital |  |  |  |  | $ (300)
Retained earnings |  |  |  |  | $ 300
Adjustment | ASU 2016-18 |  |  |  |  |
Recent accounting pronouncements |  |  |  |  |
Net cash used in investing activities |  | (1,770) |  |  |
Net change in cash, cash equivalents, and restricted cash |  | (1,770) |  |  |
Total cash, cash equivalents, and restricted cash, beginning of period |  | 18,637 |  |  |
Total cash, cash equivalents, and restricted cash, end of period |  | 16,867 |  |  |
Adjustment | ASU 2017-07 |  |  |  |  |
Recent accounting pronouncements |  |  |  |  |
Operating Expenses |  | 37 |  |  |
Other income |  | (37) |  |  |
Adjustment | ASU 2018-02 | Early Adoption |  |  |  |  |
Recent accounting pronouncements |  |  |  |  |
Accumulated other comprehensive income | (800) |  |  |  |
Retained earnings | 800 |  |  |  |
Valuation allowance | $ 800 |  |  |  |
Under previous guidance | ASU 2016-18 |  |  |  |  |
Recent accounting pronouncements |  |  |  |  |
Net cash provided by operating activities |  | 32,089 |  |  |
Net cash used in investing activities |  | (20,852) |  |  |
Net cash used in financing activities |  | (15,628) |  |  |
Effect of foreign currency exchange rates on total cash |  | 207 |  |  |
Net change in cash, cash equivalents, and restricted cash |  | (4,184) |  |  |
Total cash, cash equivalents, and restricted cash, beginning of period |  | 269,721 |  |  |
Total cash, cash equivalents, and restricted cash, end of period |  | $ 265,537 |  |  |

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