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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