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Stock-Based Compensation (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Jan. 01, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated Share-based Compensation Expense $ 3.1 $ 3.4  
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets     $ 1.3
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income $ 4.5    
Nonvested Stock Award [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period (in years) 4 years    
Nonvested Stock Award [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period (in years) 7 years    
Stock Appreciation Rights (SARs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period (in years) 4 years    
Contractual terms of stock options granted (in years) 10 years