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Stock-Based Compensation and Other Employee Benefit Plans (Schedule of Activity, Restricted Shares) (Details)
6 Months Ended
Jun. 30, 2020
$ / shares
shares
Restricted Shares [Member]  
Restricted Shares  
Non-vested restricted shares, beginning balance (in shares) 1,221,593
Granted (in shares) 933,455
Vested (in shares) (180,394)
Canceled/forfeited (in shares) (237,800)
Non-vested restricted shares, ending balance (in shares) 1,736,854
Per Share Weighted Average Grant Date Fair Value  
Non-vested restricted shares, per share weighted average grant date fair value, beginning balance (in dollars per share) | $ / shares $ 45.36
Granted (in dollars per share) | $ / shares 27.08
Vested (in dollars per share) | $ / shares 39.47
Canceled/forfeited (in dollars per share) | $ / shares 59.20
Non-vested restricted shares, per share weighted average grant date fair value, ending balance (in dollars per share) | $ / shares $ 34.25
Restricted Stock Units [Member]  
Restricted Shares  
Non-vested restricted shares, ending balance (in shares) 2,300