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Stock-Based Incentive Plans Nonvested Restricted Stock Units (Details) - $ / shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award    
Share-based Awards, Restricted Stock Units, Vested Oustanding 31,000  
Share-based Compensation Arrangement Restricted Stock Units, Nonvested 0 2,000
Share-based Compensation Arrangement by Share-based Payment Award, Restricted Stock Units, Nonvested, Weighted Average Grant Date Fair Value $ 0 $ 16.72
Share-based Compensation Arrangement by Share-based Payment Award, Restricted Stock Units, Grants in Period (2,000)  
Granted 102,000  
Nonvested at December 31, 2016 0 123,000
Granted, weighted average grant date fair value $ 3.79  
Vested, weighted average grant date fair value 16.72  
Nonvested, weighted average grant date fair value at December 31, 2016 0 $ 4.77
Vested outstanding, weighted average grant date fair value $ 15.43