Earnings Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
Weighted-average shares outstanding for basic and diluted net income per share
Net income (in dollars)	$ (12,587)	$ 15,626	$ 10,479	$ 46,814
Basic net income per share:
Weighted-average shares outstanding - Basic	60,173	59,400	59,823	59,343
Basic net income per common share (in usd per share)	$ (0.21)	$ 0.26	$ 0.18	$ 0.79
Diluted net income per share:
Weighted-average shares outstanding - Basic	60,173	59,400	59,823	59,343
Effect of potentially dilutive securities	0	5	161	68
Weighted-average shares outstanding - Diluted	60,173	59,405	59,984	59,411
Diluted net income per common share (in usd per share)	$ (0.21)	$ 0.26	$ 0.17	$ 0.79