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Stock-Based Compensation (Stock Appreciation Rights) (Details) - SARs
12 Months Ended
Dec. 31, 2016
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Exercised 9,902
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price | $ / shares $ 25.03
Number of Shares Subject to SARs Outstanding & Exercisable 2,338
Weighted-Average Remaining Contractual Life 6 months
Number of Common Shares Subject to SARs  
Outstanding at January 1 (in shares) 17,748
Forfeited (in shares) 5,508
Outstanding at December 31 (in shares) 2,338
Weighted- Average Exercise Price  
Outstanding at January 1 (in dollars per share) | $ / shares $ 25.86
Forfeited (in dollars per share) | $ / shares 26.72
Outstanding at December 31 (in dollars per share) | $ / shares $ 27.37
Weighted - Average Grant Date Fair Value  
Exercisable at December 31 (in shares) 2,338
Exercisable at December 31 (in dollars per share) | $ / shares $ 27.37
Outstanding at December 31, Weighted-Average Remaining Contractual Life 6 months
Exercisable at December 31, Weighted-Average Remaining Contractual Life 6 months
Outstanding at December 31 | $ $ 11,905
Exercisable at December 31 | $ $ 11,905
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 803
Weighted-Average Remaining Contractual Life 1 year 1 month
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 1,535
Weighted-Average Remaining Contractual Life 1 month