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Stock-Based Compensation (Stock Appreciation Rights) (Details) - SARs
12 Months Ended
Dec. 31, 2015
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Shares Subject to SARs Outstanding & Exercisable 17,748
Weighted-Average Remaining Contractual Life 1 year 6 months
Number of Common Shares Subject to SARs  
Outstanding at January 1 (in shares) 21,292
Forfeited (in shares) 3,544
Outstanding at December 31 (in shares) 17,748
Weighted- Average Exercise Price  
Outstanding at January 1 (in dollars per share) | $ / shares $ 25.96
Forfeited (in dollars per share) | $ / shares 26.47
Outstanding at December 31 (in dollars per share) | $ / shares $ 25.86
Weighted - Average Grant Date Fair Value  
Exercisable at December 31 (in shares) 17,748
Exercisable at December 31 (in dollars per share) | $ / shares $ 25.86
Outstanding at December 31, Weighted-Average Remaining Contractual Life 1 year 6 months
Exercisable at December 31, Weighted-Average Remaining Contractual Life 1 year 6 months
Outstanding at December 31 | $ $ 0
Exercisable at December 31 | $ $ 0
Exercise Price $23.26  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise Price | $ / shares $ 23.26
Number of Shares Subject to SARs Outstanding & Exercisable 2,000
Weighted-Average Remaining Contractual Life 1 year 7 months
Exercise Price $23.77  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise Price | $ / shares $ 23.77
Number of Shares Subject to SARs Outstanding & Exercisable 8,782
Weighted-Average Remaining Contractual Life 1 year 11 months
Exercise Price $29.25  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise Price | $ / shares $ 29.25
Number of Shares Subject to SARs Outstanding & Exercisable 6,966
Weighted-Average Remaining Contractual Life 1 year