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Stock-Based Compensation (Stock Appreciation Rights) (Details) - SARs - USD ($)
6 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares outstanding (in shares) 16,969 17,748
Shares exercisable (in shares) 16,969  
Shares outstanding, weighted-average exercise price (in dollars per share) $ 25.79 $ 25.86
Shares exercisable, weighted-average exercise price (in dollars per share) $ 25.79  
Shares outstanding, weighted-average remaining contractual life 1 year 1 month 6 days  
Shares exercisable, weighted-average remaining contractual life 1 year 1 month 6 days  
Shares outstanding, aggregate intrinsic value $ 0  
Shares exercisable, aggregate intrinsic value $ 0  
Number of Common Shares Subject to SARs Outstanding & Exercisable (in shares) 16,969  
Weighted-Average Remaining Contractual Life 1 year 1 month  
Forfeited 779  
Forfeited $ 26.44  
Exercise Price $23.26    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Exercise Price (in dollars per share) $ 23.26  
Number of Common Shares Subject to SARs Outstanding & Exercisable (in shares) 2,000  
Weighted-Average Remaining Contractual Life 1 year 1 month 8 days  
Exercise Price $23.77    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Exercise Price (in dollars per share) $ 23.77  
Number of Common Shares Subject to SARs Outstanding & Exercisable (in shares) 8,541  
Weighted-Average Remaining Contractual Life 1 year 6 months 9 days  
Exercise Price $29.25    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Exercise Price (in dollars per share) $ 29.25  
Number of Common Shares Subject to SARs Outstanding & Exercisable (in shares) 6,428  
Weighted-Average Remaining Contractual Life 6 months