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Shareholders' Equity (Employee Plan) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2015
USD ($)
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares reserved for share-based compensation plans 8,800,000
Unrecognized compensation cost | $ $ 17.4
Employee Stock [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares reserved for share-based compensation plans 1,000,000
Minimum percent of salary employees can invest 1.00%
Maximum percent of salary employees can invest 10.00%
Purchase prices percent of fair market value 95.00%
Number of shares issued under Plan 13,000