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Stock-Based Compensation (Stock Appreciation Rights) (Details) - SARs
12 Months Ended
Dec. 31, 2017
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Awards vesting period 3 years
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Exercised | shares 2,024
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price | $ / shares $ 27.93
Number of Common Shares Subject to SARs  
Outstanding at January 1 (in shares) | shares 2,338
Forfeited (in shares) | shares 0
Outstanding at December 31 (in shares) | shares 314
Weighted- Average Exercise Price  
Outstanding at January 1 (in dollars per share) | $ / shares $ 27.37
Forfeited (in dollars per share) | $ / shares 0.00
Outstanding at December 31 (in dollars per share) | $ / shares $ 23.77
Weighted - Average Grant Date Fair Value  
Exercisable at December 31 (in shares) | shares 314
Exercisable at December 31 (in dollars per share) | $ / shares $ 23.77
Outstanding at December 31, Weighted-Average Remaining Contractual Life 1 month
Exercisable at December 31, Weighted-Average Remaining Contractual Life 1 month
Outstanding at December 31 | $ $ 2,779
Exercisable at December 31 | $ $ 2,779
Awards expiration period 10 years