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Share-Based Payments (Compensation Expense) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Summary of compensation expense and related tax benefit recognized during each period and compensation cost expense in future periods      
Share-based compensation expense $ 9,166 $ 10,056 $ 9,242
Tax benefit recognized 3,200 3,500 3,200
Unrecognized Compensation Cost, amount 11,000    
Restricted Stock Units (RSUs) [Member]      
Summary of compensation expense and related tax benefit recognized during each period and compensation cost expense in future periods      
Share-based compensation expense 2,500 1,700 1,600
Unrecognized Compensation Cost, amount $ 3,200    
Unrecognized Compensation Cost, remaining recognition period 1 year 9 months 18 days    
Performance Shares Units [Member]      
Summary of compensation expense and related tax benefit recognized during each period and compensation cost expense in future periods      
Share-based compensation expense $ 5,900 7,600 7,100
Unrecognized Compensation Cost, amount $ 6,000    
Unrecognized Compensation Cost, remaining recognition period 1 year 7 months 12 days    
Employee Purchase Plan [Member]      
Summary of compensation expense and related tax benefit recognized during each period and compensation cost expense in future periods      
Share-based compensation expense $ 800 $ 800 $ 500
Unrecognized Compensation Cost, amount $ 1,800    
Unrecognized Compensation Cost, remaining recognition period 2 years 2 months 12 days