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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, 2018 | Dec. 31, 2016 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2015 | Mar. 31, 2006
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Common stock, shares authorized |  | 100,000,000 |  | 100,000,000 |  |  |  |
Common Stock, Shares, Outstanding |  | 24,930,725 |  | 24,930,725 |  |  |  |
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 |  |
Stock Repurchase Program, Authorized Amount |  | 100,000 |  | $ 100,000 |  |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  | $ 91,000 |  | $ 91,000 |  |  |  |
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 |  | 24,930,725 |  | 24,930,725 | 25,274,506 |  |  |
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 | 0 |  |  | 220,000
Preferred stock, shares converted to common stock |  |  |  | 0 | 111,072 | 0 |  |
Non-cash reclassification of preferred stock converted |  |  |  |  | $ 107,600 |  |  |
Stock Repurchased and Retired During Period, Shares |  | 107,418 |  |  |  |  |  |
Preferred stock, shares outstanding |  | 0 |  | 0 | 0 | 218,490 | 218,490 |
Stock Repurchased And Retired During Period Value Retained Earnings |  | $ 74,400 |  |  |  |  |  |

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