Shareholders' Equity (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	0 Months Ended		1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	May 28, 2013	Aug. 21, 2012	May 31, 2014	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Feb. 28, 2013
Shareholders' Equity [Abstract]
Common stock repurchase, authorized amount									$ 15,000,000
Stock repurchased during period, shares						488		253
Stock repurchased during period, aggregate purchase price						4,600,000		1,500,000
Common stock repurchase, remaining authorized amount				8,900,000		8,900,000
Quarterly cash dividend per share of common stock outstanding approved	$ 0.0275	$ 0.025	$ 0.03	$ 0.0300	$ 0.0275	$ 0.0875	$ 0.0800
Dividend payment from cash on hand				$ 842,000	$ 759,000	$ 2,500,000	$ 2,200,000