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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Consolidated Balance Sheets    
Accumulated depreciation of property and equipment (in dollars) $ 13,951 $ 12,495
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized 250,000,000 250,000,000
Common stock, shares issued 143,371,243 142,691,986
Common stock, shares outstanding 143,371,243 142,691,986
Foreign currency translation adjustment, tax expense $ 1,293 $ 1,293