Stock-Based Compensation (details) (USD $)	6 Months Ended
	Jun. 30, 2014
LTIP Paragraph 1 [Abstract]
Common stock was authorized for grants under the LTIP	43,625
Weighted-average per share grant date fair value of unvested shares	$ 42.43
Fair value pricing model LTIP	Monte-Carlo option pricing model
Stock price on valuation date	$ 41.78
Performance term (in years)	3 years
Quarterly Dividends Paid Per Share	$ 0.460
Expected dividend yield	4.30%
Dividend Discount Factor	0.8845
LTIP Paragraph 2 [Abstract]
Shares Granted Under RSU	31,113
Stock Price On Restricted Stock Unit Grant Date, Minimum	$ 42.03
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options	$ 2,400,000
Unrecognized compensation cost, restricted stock units, period for recognition	through 2019
SOP Paragraph 1 [Abstract]
Unrecognized compensation cost, options	$ 100,000.0
Unrecognized compensation cost, period for recognition	2014