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Revenue Recognition - Impacts of adoption in the current period - BS (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017 | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | --- | ---
CONDENSED CONSOLIDATED BALANCE SHEETS |  |  |  |  |
Prepayments and other current assets | $ 33,450 |  | $ 68,136 |  |
Total current assets | 303,355 |  | 342,928 |  |
Other assets | 37,060 |  | 36,774 |  |
Total assets | 1,196,818 |  | 1,205,605 |  |
Advance payments and deposits | 26,750 |  | 25,178 |  |
Accrued taxes | 12,067 |  | 6,751 |  |
Total current liabilities | 168,891 |  | 161,705 |  |
Deferred tax liability | 30,945 |  | 31,732 |  |
Total liabilities | 382,803 |  | 375,382 |  |
Retained earnings | 546,368 |  | 552,948 |  |
Minority interest | 133,408 |  | 141,496 |  |
Total Equity | 814,015 |  | 830,223 | $ 813,953 | $ 809,169
Total liabilities and equity | 1,196,818 |  | $ 1,205,605 |  |
Change |  |  |  |  |
CONDENSED CONSOLIDATED BALANCE SHEETS |  |  |  |  |
Retained earnings |  | $ 1,500 |  |  |
Minority interest |  | 1,100 |  |  |
ASU 2014-09 | Change |  |  |  |  |
CONDENSED CONSOLIDATED BALANCE SHEETS |  |  |  |  |
Prepayments and other current assets | 2,426 |  |  |  |
Total current assets | 2,426 |  |  |  |
Other assets | 1,298 |  |  |  |
Total assets | 3,724 |  |  |  |
Advance payments and deposits | 277 |  |  |  |
Accrued taxes | 93 |  |  |  |
Total current liabilities | 370 |  |  |  |
Deferred tax liability | 301 | $ 300 |  |  |
Total liabilities | 671 |  |  |  |
Retained earnings | 1,725 |  |  |  |
Minority interest | 1,328 |  |  |  |
Total Equity | 3,053 |  |  |  |
Total liabilities and equity | 3,724 |  |  |  |
ASU 2014-09 | Under previous guidance |  |  |  |  |
CONDENSED CONSOLIDATED BALANCE SHEETS |  |  |  |  |
Prepayments and other current assets | 31,024 |  |  |  |
Total current assets | 300,929 |  |  |  |
Other assets | 35,762 |  |  |  |
Total assets | 1,193,094 |  |  |  |
Advance payments and deposits | 26,473 |  |  |  |
Accrued taxes | 11,974 |  |  |  |
Total current liabilities | 168,521 |  |  |  |
Deferred tax liability | 30,644 |  |  |  |
Total liabilities | 382,132 |  |  |  |
Retained earnings | 544,643 |  |  |  |
Minority interest | 132,080 |  |  |  |
Total Equity | 810,962 |  |  |  |
Total liabilities and equity | $ 1,193,094 |  |  |  |

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