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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		9 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Numerator
Net income	$ 38,167	$ 314,793	$ 103,474	$ 379,257
Denominator
Denominator for basic earnings per share — weighted average shares outstanding (in shares)	51,881	53,129	52,119	53,089
Dilutive effect of nonvested restricted stock units and options issued to employees and directors (in shares)	321	414	312	442
Denominator for diluted earnings per share (in shares)	52,202	53,543	52,431	53,531
Earnings per Common Share:
Basic earnings per share (in USD per share)	$ 0.74	$ 5.93	$ 1.99	$ 7.14
Diluted earnings per share (in USD per share)	$ 0.73	$ 5.88	$ 1.97	$ 7.08

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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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