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Earnings Per Share ("EPS") and Cash Dividends - Additional Information (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended		1 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013	Apr. 17, 2014 Subsequent Event
Earnings Per Share Diluted [Line Items]
Options and unvested restricted stock	135,696	255,527	110,096	278,066
Company paid cash dividends			$ 5,305	$ 4,725
Company paid cash dividends per share			$ 0.3875	$ 0.35
Cash dividends declared per share					$ 0.20
Cash Dividend, Payable Date					Jun. 27, 2014
Cash dividends declared					$ 2,740