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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (Parenthetical)
$ in Thousands
Sep. 30, 2017
USD ($)
subsidiary
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
subsidiary
CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited)      
Number of consolidated joint ventures | subsidiary 1   1
Dividends accrued but not paid by joint ventures | $ $ 521 $ 499 $ 520