Summary of Significant Accounting Policies (Details 2) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011
Numerator:
Income from continuing operations	$ 11,600	$ 12,109	$ 17,573	$ 18,976
Income (Loss) from discontinued operations, net of tax	11	(1,131)	55	(82)
Net income	$ 11,611	$ 10,978	$ 17,628	$ 18,894
Denominator:
Weighted average shares outstanding for basic income per common share	9,548	9,723	9,594	9,733
Effect of dilutive stock options	6	9	3	6
Adjusted weighted average share outstanding for diluted income per common share	9,554	9,732	9,597	9,739
Basic:
Continuing operations	$ 1.21	$ 1.25	$ 1.83	$ 1.95
Discontinued operations	$ 0.00	$ (0.12)	$ 0.01	$ (0.01)
Total	$ 1.22	$ 1.13	$ 1.84	$ 1.94
Diluted:
Continuing operations	$ 1.21	$ 1.24	$ 1.83	$ 1.95
Discontinued operations	$ 0.00	$ (0.12)	$ 0.01	$ (0.01)
Total	$ 1.22	$ 1.13	$ 1.84	$ 1.94