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Stock-Based Compensation (Details) - Unvested Restricted Stock
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Restricted Shares Granted (in shares) | shares 4,047
Value Per Share (in dollars per share) | $ / shares $ 7.87
Total value of restricted shares granted | $ $ 31,857