Common And Preferred Stock (Narrative) (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended	9 Months Ended	12 Months Ended
	Jan. 31, 2017	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2006
Class of Stock [Line Items]
Common stock, shares authorized		100,000,000		100,000,000
Common Stock, Shares, Outstanding		25,274,506		25,274,506
Preferred stock, shares authorized		5,000,000		5,000,000
Payments for Repurchase of Redeemable Convertible Preferred Stock	$ 178,400			$ 104,012
Dividends, Preferred Stock, Cash		$ 15,000		11,061	$ 14,748	$ 14,824
Stock Repurchase Program, Authorized Amount		100,000		100,000
Stock Repurchased And Retired During Period Value Retained Earnings				(74,353)	$ 0	$ (36)
Stock Repurchase Program, Remaining Authorized Repurchase Amount		$ 100,000		$ 100,000
Common Stock [Member]
Class of Stock [Line Items]
Common stock, shares authorized		100,000,000		100,000,000	100,000,000
Common Stock, Shares, Outstanding		25,274,506		25,274,506	22,717,735
Conversion of Stock, Shares Issued			2,487,118
Series A Junior Participating Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock, shares authorized		500,000		500,000	500,000
Preferred stock, shares issued		0		0	0
Preferred stock, shares outstanding		0		0	0
Series B 6.75% Convertible Perpetual Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock, shares authorized		220,000		220,000	220,000
Preferred stock, shares issued		0		0	218,490			220,000
Conversion of Stock, Shares Converted			111,072	(111,072)	0	0
Conversion of Stock, Amount Converted			$ 107,600
Stock Repurchased and Retired During Period, Shares		107,418
Preferred stock, shares outstanding		0		0	218,490	218,490	219,999
Stock Repurchased And Retired During Period Value Retained Earnings		$ 74,400		$ 74,353		$ (36)