Stockholders' Equity (Details) (USD $)	3 Months Ended		1 Months Ended	3 Months Ended	1 Months Ended
	Oct. 31, 2013	Oct. 31, 2013 Quarterly Dividend - First	Dec. 09, 2013 Quarterly Dividend - Second Subsequent	Oct. 31, 2013 Third Stock Repurchase Program	Dec. 09, 2013 Third Stock Repurchase Program Subsequent
Stock Repurchase Program
Shares acquired				124,753
Average price per share of shares repurchased on the open market				$ 28.73
Aggregate cost including transaction costs	$ 3,585,000			$ 3,585,000
Stock Repurchase Program Authorization Date				Dec. 06, 2012	Dec. 09, 2013
Maximum amount authorized by the Board of Directors for repurchases of the company's common stock				50,000,000	100,000,000
Stock repurchase program, remaining authorized repurchase amount				$ 30,752,000	$ 71,000,000
Dividends
Targeted annual dividend per share	$ 1.10	$ 1.10	$ 1.20
Date declared	Oct. 03, 2013	Oct. 03, 2013	Dec. 09, 2013
Date of record	Oct. 18, 2013		Jan. 17, 2014
Date paid		Nov. 19, 2013	Feb. 19, 2014
Quarterly dividend payment amount per share		$ 0.275	$ 0.30