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Earnings Per Share (Computation of Basis and Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Numerator
Net income (loss)	$ 33,759	$ (5,531)
Denominator
Denominator for basic earnings per share — weighted average shares outstanding (in shares)	53,038	52,881
Dilutive effect of unvested restricted stock units and options issued to employees and directors (in shares)	471	0
Denominator for diluted earnings per share (in shares)	53,509	52,881
Earnings per Common Share:
Basic net earnings per share (in USD per share)	$ 0.64	$ (0.10)
Diluted net earnings per share (in USD per share)	$ 0.63	$ (0.10)

X

- Definition

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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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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