Quarterly report pursuant to Section 13 or 15(d)

CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (Parentheticals)

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CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (Parentheticals) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Income Statement [Abstract]    
Interest costs capitalized $ 47 $ 45