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Treasury Stock: (Details) - Jun. 30, 2015 - USD ($)
$ in Millions
Total
Treasury stock purchase plan [Abstract]  
Treasury Stock Purchase Plan $ 40.0
Treasury Stock Purchase Plan Remaining Available $ 22.5
Shares Paid for Tax Withholding for Share Based Compensation 16,401
Payments Related to Tax Withholding for Share-based Compensation $ 1.4