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Revenue Recognition - Impacts of adoption in the current period - BS (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | --- | ---
CONDENSED CONSOLIDATED BALANCE SHEETS |  |  |  |  |
Prepayments and other current assets | $ 37,855 |  | $ 68,136 |  |
Total current assets | 275,765 |  | 342,928 |  |
Other assets | 37,708 |  | 36,774 |  |
Total assets | 1,107,304 |  | 1,205,605 |  |
Advance payments and deposits | 20,574 |  | 25,178 |  |
Accrued taxes | 31,795 |  | 6,751 |  |
Total current liabilities | 140,650 |  | 161,705 |  |
Deferred tax liability | 10,276 |  | 31,732 |  |
Total liabilities | 283,980 |  | 375,382 |  |
Retained earnings | 563,593 |  | 552,948 |  |
Minority interest | 127,937 |  | 141,496 |  |
Total equity | 823,324 |  | 830,223 | $ 809,169 | $ 761,724
Total liabilities and equity | 1,107,304 |  | $ 1,205,605 |  |
ASU 2014-09 | Change |  |  |  |  |
CONDENSED CONSOLIDATED BALANCE SHEETS |  |  |  |  |
Prepayments and other current assets | 3,319 |  |  |  |
Total current assets | 3,319 |  |  |  |
Other assets | 1,785 |  |  |  |
Total assets | 5,104 |  |  |  |
Advance payments and deposits | 337 |  |  |  |
Accrued taxes | 131 |  |  |  |
Total current liabilities | 468 |  |  |  |
Deferred tax liability | 302 | $ 300 |  |  |
Total liabilities | 770 |  |  |  |
Retained earnings | 2,481 | 1,500 |  |  |
Minority interest | 1,853 | $ 1,100 |  |  |
Total equity | 4,334 |  |  |  |
Total liabilities and equity | 5,104 |  |  |  |
ASU 2014-09 | Under previous guidance |  |  |  |  |
CONDENSED CONSOLIDATED BALANCE SHEETS |  |  |  |  |
Prepayments and other current assets | 34,536 |  |  |  |
Total current assets | 272,446 |  |  |  |
Other assets | 35,923 |  |  |  |
Total assets | 1,102,200 |  |  |  |
Advance payments and deposits | 20,237 |  |  |  |
Accrued taxes | 31,664 |  |  |  |
Total current liabilities | 140,182 |  |  |  |
Deferred tax liability | 9,974 |  |  |  |
Total liabilities | 283,210 |  |  |  |
Retained earnings | 561,112 |  |  |  |
Minority interest | 126,084 |  |  |  |
Total equity | 818,990 |  |  |  |
Total liabilities and equity | $ 1,102,200 |  |  |  |

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