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Consolidated Statements of Operations (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Consolidated Statements of Operations        
Nonvested stock amortization expenses $ 1,570 $ 5,442 $ 2,281 $ 10,928