Supplemental Consolidated Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Sep. 30, 2013

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Information

	Quarters Ended
	December 31, 2012		March 31, 2013		June 30, 2013		September 30, 2013
	(In thousands, except per-share amounts)
Total revenues	$	44,302	$	46,571	$	48,105	$	50,388
Operating income	$	11,443	$	13,921	$	13,975	$	13,043
Income before taxes	$	11,327	$	13,795	$	13,783	$	12,862
Net income	$	7,113	$	9,343	$	8,449	$	10,029
Diluted earnings per share	$	0.24	$	0.31	$	0.28	$	0.32
Weighted average common shares outstanding, diluted	30,017		30,348		30,710		30,936

	Quarters Ended
	December 31, 2011		March 31, 2012		June 30, 2012		September 30, 2012
	(In thousands, except per-share amounts)
Total revenues	$	34,795	$	39,532	$	40,464	$	41,385
Operating income (loss)	$	3,795	$	6,668	$	7,733	$	5,895
Income (loss) before taxes	$	4,795	$	6,999	$	7,701	$	5,802
Net income (loss)	$	5,782	$	6,818	$	7,249	$	8,325
Diluted earnings (loss) per share	$	0.21	$	0.24	$	0.25	$	0.28
Weighted average common shares outstanding, diluted	28,109		28,655		29,275		29,828