Earnings Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	9 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Weighted-average shares outstanding for basic and diluted net income per share
Net income (in dollars)	$ 6,676us-gaap_NetIncomeLoss	$ (12,587)us-gaap_NetIncomeLoss	$ 16,589us-gaap_NetIncomeLoss	$ 10,479us-gaap_NetIncomeLoss
Basic net income per share:
Weighted-average shares outstanding - Basic	60,272	60,173	60,250	59,823
Basic net income per common share (in usd per share)	$ 0.11us-gaap_EarningsPerShareBasic	$ (0.21)us-gaap_EarningsPerShareBasic	$ 0.28us-gaap_EarningsPerShareBasic	$ 0.18us-gaap_EarningsPerShareBasic
Diluted net income per share:
Weighted-average shares outstanding - Basic	60,272	60,173	60,250	59,823
Effect of potentially dilutive securities	583	0	563	161
Weighted-average shares outstanding - Diluted	60,855	60,173	60,813	59,984
Diluted net income per common share (in usd per share)	$ 0.11us-gaap_EarningsPerShareDiluted	$ (0.21)us-gaap_EarningsPerShareDiluted	$ 0.27us-gaap_EarningsPerShareDiluted	$ 0.17us-gaap_EarningsPerShareDiluted

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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