Stockholders' Equity (Details) (USD $)	0 Months Ended				3 Months Ended	9 Months Ended
	Oct. 30, 2014	Aug. 05, 2014	May 07, 2014	Feb. 12, 2014	Sep. 30, 2014	Sep. 30, 2014 2012 Repurchase Program [Member]
Class of Stock [Line Items]
Maximum number of shares authorized to be repurchased						5,000,000
Stock Repurchased						0
Dividend amount to be paid, per common share	$ 0.2850	$ 0.2775	$ 0.2700	$ 0.2625
Dividend, declaration date	Oct. 30, 2014	Aug. 05, 2014	May 07, 2014	Feb. 11, 2014
Dividend, date to be paid	Dec. 04, 2014	Sep. 02, 2014	Jun. 03, 2014	Mar. 10, 2014
Dividend, date of record	Nov. 17, 2014	Aug. 18, 2014	May 19, 2014	Feb. 24, 2014
Shares Paid for Tax Withholding for Share Based Compensation					13,349