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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (Parenthetical)
$ in Thousands
Jun. 30, 2018
USD ($)
subsidiary
Dec. 31, 2017
USD ($)
Jun. 30, 2017
USD ($)
subsidiary
CONDENSED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS      
Number of consolidated joint ventures | subsidiary 1   1
Dividends accrued but not paid by joint ventures | $ $ 524 $ 533 $ 512