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Common Stock (Performance Shares) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
shares
Dec. 31, 2014
USD ($)
Dec. 31, 2013
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 - aggregated intrinsic value [1] $ 0 $ 0 $ 1,450
Performance Shares Payout Level 100.00%    
Performance Shares | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance shares vested - Performance Shares Awarded | shares 0    
Performance Shares | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance shares vested - Performance Shares Awarded | shares 155,970    
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 - aggregated intrinsic value $ 0    
February 20, 2015 | 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 $ 1,502    
Performance shares vested - aggregated intrinsic value $ 0    
February 18, 2014 | 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 $ 954    
Performance shares vested - aggregated intrinsic value $ 0    
January 29, 2013 | Performance Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance shares vested - Payout Ratio 150.00%    
Performance shares vested - Performance Shares Awarded | shares 64,275    
Performance shares vested - Compensation Costs Expensed $ 849    
Performance shares vested - aggregated intrinsic value $ 2,176    
[1] Based on a 100% performance level.