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Business Segments, Concentration of Business, and Credit Risk and Significant Customers (Assets) (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Mar. 31, 2015
Jun. 30, 2014
Mar. 31, 2014
Reconciliations of total assets from reportable segments to the condensed consolidated balance sheets        
Total assets for reportable segments $ 1,253,498 $ 1,169,933    
Unallocated cash and cash equivalents 168,744 225,143 $ 158,226 $ 245,088
Consolidated total assets 1,253,498 1,169,933    
Reportable segments        
Reconciliations of total assets from reportable segments to the condensed consolidated balance sheets        
Total assets for reportable segments 807,207 698,174    
Consolidated total assets 807,207 698,174    
Unallocated to Segments        
Reconciliations of total assets from reportable segments to the condensed consolidated balance sheets        
Unallocated cash and cash equivalents 168,744 225,143    
Unallocated deferred tax assets 29,805 29,083    
Other unallocated corporate assets $ 247,742 $ 217,533