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Stock-Based Compensation (Summary of Restricted Stock Awards Activity) (Details) - Restricted Stock [Member]
shares in Thousands
12 Months Ended
Dec. 31, 2018
$ / shares
shares
Number of shares  
Outstanding and Unvested at January 1, 2018 | shares 18,750
Restricted stock granted | shares 0
Restricted stock vested | shares 0
Restricted stock forfeited | shares (18,750)
Outstanding and Unvested at December 31, 2018 | shares 0
Per Share Weighted-Average Grant-Date Fair Value  
Outstanding and Unvested at January 1, 2018 | $ / shares $ 4.99
Restricted stock granted | $ / shares 0
Restricted stock vested | $ / shares 0
Restricted stock forfeited | $ / shares 4.99
Outstanding and Unvested at December 31, 2018 | $ / shares $ 0