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Employee Stock and Benefit Plans (Restricted Stock Unit and Award Activity) (Details) - Restricted Stock Unit - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Number of Shares [Roll Forward]    
Nonvested shares, beginning of year (in shares) 698 192
Granted (in shares) 701 943
Vested (in shares) (499) (402)
Forfeited/Canceled (in shares) (55) (35)
Nonvested shares, end of year (in shares) 845 698
Weighted Average Grant Date Fair Value [Roll Forward]    
Nonvested shares, beginning of year (in dollars per share) $ 2.63 $ 4.53
Granted (in dollars per share) 2.54 2.56
Vested (in dollars per share) 3.10 3.18
Forfeited/Canceled (in dollars per share) 3.33 4.69
Nonvested shares, beginning of year (in dollars per share) $ 2.24 $ 2.63
Total Fair Value of Vested Awards    
Total fair value of vested awards $ 1,547 $ 1,278
Additional Information    
Aggregate intrinsic value, outstanding $ 1,000  
Weighted average remaining contractual term 1 year