Stock-Based Compensation (Details) $ / shares in Units, $ in Millions	9 Months Ended
	Sep. 30, 2015 USD ($) $ / shares shares
Share-based Compensation [Abstract]
Common stock was authorized for grants under the LTIP | shares	47,550
Weighted-average per share grant date fair value of unvested shares	$ 51.85
LTIP unrecognized compensation expense | $	$ 2.6
Unrecognized compensation cost, period for recognition	through 2017
Fair value pricing model LTIP	Monte-Carlo option pricing model
Stock price on valuation date	$ 47.64
Performance term (in years)	3 years
Quarterly Dividends Paid Per Share	$ 0.465
Expected dividend yield	3.80%
Dividend Discount Factor	0.8966
Shares Granted Under RSU | shares	37,264
Stock Price On Restricted Stock Unit Grant Date, Minimum	$ 46.28
RSU unrecognized compensation expense | $	$ 2.9
Unrecognized compensation cost, restricted stock units, period for recognition	through 2019