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Stockholders' Equity - Summary of Stock Option Activity under the Company's Equity-Based Plans (Details)
3 Months Ended
Mar. 31, 2017
shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Number of Shares, Beginning Balance 2,815,224
Number of Shares, Granted 0
Number of Shares, Exercised (349,264)
Number of Shares, Forfeited (20,174)
Number of Shares, Expired 0
Number of Shares, Ending Balance 2,445,786
Number of Shares, Exercisable, Ending Balance 1,872,720