Stock-Based Compensation (Number, Weighted Average Exercise Price and Weighted Average Remaining Contractual Life of Options Outstanding) (Details)	12 Months Ended
	Dec. 31, 2015 $ / shares shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Options (in shares) | shares	262,282
Weighted Average Exercise Price (in dollars per share)	$ 42.52
Weighted Average Remaining Contractual Life (Years)	2 years 9 months 20 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
Range of Exercise Prices Upper Limit (in dollars per share)	$ 38
Number of Options (in shares) | shares	22,083
Weighted Average Exercise Price (in dollars per share)	$ 27.70
Weighted Average Remaining Contractual Life (Years)	3 years 1 month 29 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
Number of Options (in shares) | shares	80,434
Weighted Average Exercise Price (in dollars per share)	$ 41.79
Weighted Average Remaining Contractual Life (Years)	2 years 1 month 29 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	116,665
Weighted Average Exercise Price (in dollars per share)	$ 43.90
Weighted Average Remaining Contractual Life (Years)	3 years 9 months 15 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	43,100
Weighted Average Exercise Price (in dollars per share)	$ 47.75
Weighted Average Remaining Contractual Life (Years)	1 year 1 month 23 days