Common And Preferred Stock (Narrative) (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Jan. 31, 2017	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2006
Class of Stock [Line Items]
Common stock, shares authorized		100,000,000
Common Stock, Shares, Outstanding		24,989,946
Preferred stock, shares authorized		5,000,000
Non-cash reclassification of preferred stock converted				$ 0
Payments for Repurchase of Redeemable Convertible Preferred Stock	$ 178,400			104,012
Dividends, Preferred Stock, Cash				$ 11,061
Stock Repurchase Program, Authorized Amount		$ 100,000
Stock Repurchased And Retired During Period Value Retained Earnings		1,046
Stock Repurchase Program, Remaining Authorized Repurchase Amount		$ 90,000
Common Stock [Member]
Class of Stock [Line Items]
Common stock, shares authorized		100,000,000	100,000,000
Common Stock, Shares, Outstanding		24,989,946	24,930,725
Conversion of Stock, Shares Issued				2,487,118
Stock Repurchased During Period, Shares		30,777	403,624	0
Series A Junior Participating Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock, shares authorized		500,000	500,000
Preferred stock, shares issued		0	0
Preferred stock, shares outstanding		0	0
Series B 6.75% Convertible Perpetual Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock, shares authorized		220,000	220,000
Preferred stock, shares issued		0	0			220,000
Preferred stock, shares converted to common stock		0	0	111,072
Non-cash reclassification of preferred stock converted				$ 107,600
Stock Repurchased and Retired During Period, Shares				107,418
Dividends, Preferred Stock, Cash				$ 15,000
Preferred stock, shares outstanding		0	0	0	218,490
Stock Repurchased And Retired During Period Value Retained Earnings				$ 74,400