Earnings Per Share (Tables)

3 Months Ended

Jun. 30, 2011

Earnings Per Share (Tables) [Abstract]

Weighted-average shares outstanding for basic and diluted net income per share

	Three Months Ended June 30,
	2011		2010
Net income	$	18,983	$	12,092
Basic net income per share:
Weighted-average shares outstanding — Basic		29,181		28,896
Basic net income per common share	$	0.65	$	0.42
Net income	$	18,983	$	12,092
Diluted net income per share:
Weighted-average shares outstanding — Basic		29,181		28,896
Effect of potentially dilutive securities		219		161
Weighted-average shares outstanding — Diluted		29,400		29,057
Diluted net income per common share	$	0.65	$	0.42