Shareholders' Equity (Details) (USD $)	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012
NASDAQ Market Prices
Dividends Declared	$ 0.13	$ 0.12	$ 0.12	$ 0.11	$ 0.11	$ 0.11
High
NASDAQ Market Prices
Stock Price	$ 14.30	$ 13.50	$ 12.46	$ 12.50	$ 12.00	$ 11.80
Low
NASDAQ Market Prices
Stock Price	$ 12.83	$ 12.00	$ 10.72	$ 11.10	$ 11.05	$ 10.10