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Equity Incentive Plan Details 3 (Details) - $ / shares
$ / shares in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Aggregate Intrinsic Value [Abstract]    
Restricted Stock Units, Nonvested, Intrinsic Value $ 27.8 $ 29.1
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Restricted Stock Units, Nonvested, Number, Beginning 96,097  
Restricted Stock Units, Grants in Period 25,970  
Restricted Stock Units, Vested in Period (31,553)  
Restricted Stock Units, Forfeited in Period (8,440)  
Restricted Stock Units, Nonvested, Number, Ending 82,074