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Schedule of Stock-Based Compensation Expense Expected to be Recognized (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award    
Stock-based compensation expense $ 5,982 $ 7,285
RSUs    
Share-based Compensation Arrangement by Share-based Payment Award    
Stock-based compensation expense 5,982 $ 7,279
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options $ 51,000