Annual report pursuant to Section 13 and 15(d)

VARIABLE INTEREST ENTITIES AND EQUITY INVESTMENTS AND ADVANCES Era do Brazil Narrative (Details)

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VARIABLE INTEREST ENTITIES AND EQUITY INVESTMENTS AND ADVANCES Era do Brazil Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jul. 01, 2011
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Oct. 01, 2015
Schedule of Equity Method Investments [Line Items]          
Investments in and advances to equity investees   $ 126 $ 0 $ 36  
Era do Brazil          
Schedule of Equity Method Investments [Line Items]          
Investments in and advances to equity investees $ 4,800        
Era do Brazil          
Schedule of Equity Method Investments [Line Items]          
Remaining ownership percentage acquired         50.00%