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Revised Financial Statements (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Sep. 30, 2015
Error Corrections and Prior Period Adjustments Restatement [Line Items]          
Out-of-period adjustment, net affect on after-tax income $ 7,500        
Retained earnings   $ 1,283,549     $ 1,247,485
Out-of-period adjustment net affect on diluted earnings per share (in dollars per share)   $ 0.03 $ 0.06 $ 0.06  
Revision          
Error Corrections and Prior Period Adjustments Restatement [Line Items]          
Retained earnings   $ (6,659)     $ (6,659)