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Stock-Based Compensation (Number, Weighted Average Exercise Price and Weighted Average Remaining Contractual Life of Options Outstanding) (Details)
12 Months Ended
Dec. 31, 2016
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Options (in shares) | shares 171,517
Weighted Average Exercise Price (in dollars per share) $ 41.59
Weighted Average Remaining Contractual Life (Years) 2 years 7 months 17 days
$27.00 - $38.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices Lower Limit (in dollars per share) $ 27.00
Range of Exercise Prices Upper Limit (in dollars per share) $ 38.00
Number of Options (in shares) | shares 19,583
Weighted Average Exercise Price (in dollars per share) $ 27.70
Weighted Average Remaining Contractual Life (Years) 2 years 4 months 28 days
$38.01 - $42.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices Lower Limit (in dollars per share) $ 38.01
Range of Exercise Prices Upper Limit (in dollars per share) $ 42.00
Number of Options (in shares) | shares 49,334
Weighted Average Exercise Price (in dollars per share) $ 41.79
Weighted Average Remaining Contractual Life (Years) 1 year 4 months 28 days
$42.01 - $45.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices Lower Limit (in dollars per share) $ 42.01
Range of Exercise Prices Upper Limit (in dollars per share) $ 45
Number of Options (in shares) | shares 97,500
Weighted Average Exercise Price (in dollars per share) $ 43.95
Weighted Average Remaining Contractual Life (Years) 3 years 4 months 28 days
$45.01 - $50.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices Lower Limit (in dollars per share) $ 45.01
Range of Exercise Prices Upper Limit (in dollars per share) $ 50
Number of Options (in shares) | shares 5,100
Weighted Average Exercise Price (in dollars per share) $ 47.75
Weighted Average Remaining Contractual Life (Years) 4 months 24 days