Condensed Consolidated Statement of Stockholders' Equity (USD $) In Thousands, except Share data	Total	Common Stock	Preferred Stock	Additional Paid-in Capital	Retained Earnings	Note Receivable For Common Stock	Common Stock Held in Treasury
Beginning Balance at Mar. 31, 2012	$ 359,520	$ 4	$ 0	$ 277,846	$ 129,281	$ (41)	$ (47,570)
Beginning Balance (in shares) at Mar. 31, 2012		36,351,716
Net income	15,448				15,448
Payments received on notes receivable for issuance of common stock	41					41
Exercise of stock options and vesting of RSUs (in shares)		545,406
Exercise of stock options and vesting of RSUs	4,184			4,184
Stock compensation expense	3,882			3,882
Excess tax benefit deficiencies from stock-based compensation	500			500
Repurchase of common stock (in shares)		(3,558,600)
Repurchase of common stock	(30,041)						(30,041)
Ending Balance at Dec. 31, 2012	$ 353,534	$ 4	$ 0	$ 286,412	$ 144,729	$ 0	$ (77,611)
Ending Balance (in shares) at Dec. 31, 2012		33,338,522