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Common Stock (Performance Shares) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
The Number of Simulations on Fair Value of Average Payout 1,000,000    
Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance Shares Payout Level 0.00%    
Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance Shares Payout Level 200.00%    
Performance Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based payment award on performance, performance evaluation period 3 years    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Method Used Monte Carlo simulation    
Performance shares vested - Aggregate Intrinsic Value, [1] $ 2,040 $ 512 $ 0
Performance Shares Payout Level 100.00% 32.00% 0.00%
Performance Shares | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance shares vested - Performance Shares Awarded | shares 223,885    
January 30, 2019 | Performance Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance shares vested - Payout Ratio 71.00%    
Performance shares vested - Performance Shares Awarded | shares 39,923    
Performance shares vested - Compensation Costs Expensed $ 2,143    
Performance shares vested - Aggregate Intrinsic Value, $ 2,046    
January 31, 2018 | Performance Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance shares vested - Payout Ratio 175.00%    
Performance shares vested - Performance Shares Awarded | shares 68,379    
Performance shares vested - Compensation Costs Expensed $ 1,499    
Performance shares vested - Aggregate Intrinsic Value, $ 3,569    
January 25, 2017 | Performance Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance shares vested - Payout Ratio 32.00%    
Performance shares vested - Performance Shares Awarded | shares 11,314    
Performance shares vested - Compensation Costs Expensed $ 932    
Performance shares vested - Aggregate Intrinsic Value, $ 512    
January 27, 2016 | Performance Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance shares vested - Payout Ratio 0.00%    
Performance shares vested - Performance Shares Awarded | shares 0    
Performance shares vested - Compensation Costs Expensed $ 851    
Performance shares vested - Aggregate Intrinsic Value, $ 0    
[1] Based on a 100%, 32% and 0% performance level, respectively.