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Condensed Consolidated Statements of Operations (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Condensed Consolidated Statements of Operations        
Nonvested stock amortization expenses $ 644 $ 1,255 $ 1,776 $ 3,536