Stockholders' Equity (Details) (USD $)	0 Months Ended					12 Months Ended
	Feb. 12, 2014	Nov. 05, 2013	Aug. 07, 2013	May 07, 2013	Feb. 13, 2013	Dec. 31, 2013	Dec. 31, 2012
Class of Stock [Line Items]
Preferred Stock, Par or Stated Value Per Share						$ 0.01	$ 0.01
Preferred Stock, Value, Issued						$ 5,064,000
Stock Repurchased							2,100,000
Aggregate cost for repurchase of common stock							$ 58,600,000
Shares surrendered to pay exercise price or satisfy tax withholding obligations for stock options exercised/restricted stock						105,828
Dividend amount to be paid, per common share	$ 0.2625	$ 0.255	$ 0.2475	$ 0.24	$ 0.2325
Dividend, declaration date	Feb. 11, 2014	Nov. 05, 2013	Aug. 07, 2013	May 07, 2013	Feb. 12, 2013
Dividend, date to be paid	Mar. 10, 2014	Dec. 04, 2013	Sep. 03, 2013	Jun. 04, 2013	Mar. 04, 2013
Dividend, date of record	Feb. 24, 2014	Nov. 18, 2013	Aug. 19, 2013	May 20, 2013	Feb. 25, 2013
2012 Repurchase Program [Member]
Class of Stock [Line Items]
Maximum number of shares authorized to be repurchased						5,000,000