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Stock-based Compensation - Schedule of Equity Compensation Plan by Arrangements (Details) - 2013 Equity Compensation Plan [Member]
12 Months Ended
Dec. 31, 2018
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Awards Reserved for Issuance 17,890,000
Awards Issued 15,515,000 [1]
Awards Available for Grant 2,375,000
[1] Includes both restricted stock grants and option grants