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Shareholders' Equity (Share Buyback Programs) (Details) - USD ($)
 1 Months Ended 12 Months Ended 37 Months Ended
Mar. 31, 2017
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2017
Class of Stock [Line Items]          
Shares repurchased, amount   $ 83,786,000 $ 70,358,000 $ 1,663,000  
March 2014 program          
Class of Stock [Line Items]          
Shares approved (in shares) 17,311,000 17,311,000     17,311,000
Shares approved, amount $ 250,000,000 $ 250,000,000 $ 250,000,000.0   $ 250,000,000
Shares repurchased (in shares)         9,093,000
Shares repurchased, amount         $ 155,358,000
March 2017 program          
Class of Stock [Line Items]          
Shares approved, amount $ 250,000,000.0 $ 250,000,000.0     $ 250,000,000.0
Shares repurchased (in shares) 0        
Shares repurchased, amount $ 0