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Stock-Based Compensation and Employee Benefit Plans (Restricted Stock Unit Activity) (Details) - RSUs and PRSUs
6 Months Ended
Jun. 30, 2019
$ / shares
shares
Number of RSUs and PRSUs  
Unvested beginning balance (in shares) | shares 3,307,561
RSUs and PRSUs granted (in shares) | shares 1,984,378
RSUs and PRSUs vested (in shares) | shares (585,312)
RSUs and PRSUs forfeited/expired (in shares) | shares (294,195)
Unvested ending balance (in shares) | shares 4,412,432
Expected to vest after March 31, 2019 (in shares) | shares 3,594,305
Weighted-Average Grant Date Fair Value  
Unvested, beginning balance (in dollars per share) | $ / shares $ 6.00
RSUs and PRSUs granted (in dollars per share) | $ / shares 5.64
RSUs and PRSUs vested (in dollars per share) | $ / shares 6.57
RSUs and PRSUs forfeited/expired (in dollars per share) | $ / shares 5.78
Unvested, ending balance (in dollars per share) | $ / shares 5.78
Expected to vest after March 31, 2019 (in dollars per share) | $ / shares $ 5.76