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Earnings Per Share Earnings Per Share (Narrative) (Details)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2018
shares
Dec. 31, 2016
shares
Mar. 31, 2018
USD ($)
shares
Mar. 31, 2017
USD ($)
shares
Mar. 31, 2016
USD ($)
$ / shares
shares
Stock Repurchased And Retired During Period Value Retained Earnings | $     $ 0 $ (74,353) $ 0
Potentially dilutive securities         133,600
Weighted-average exercise price | $ / shares         62.66
Series B 6.75% Convertible Perpetual Preferred Stock [Member]          
Preferred stock, shares converted to common stock     0 111,072 0
Stock Repurchased and Retired During Period, Shares 107,418        
Stock Repurchased And Retired During Period Value Retained Earnings | $       $ 74,353  
Common Stock [Member]          
Conversion of Stock, Shares Issued   2,487,118