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Stock-Based Compensation (Tables)
3 Months Ended
Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Stock-based Compensation, Stock Options and Stock Appreciation Rights Award Activity
Award Type
 
Number of 
Exercised Units
 
Weighted Average
Exercised Price
 
Number of Exercisable Units
 
Weighted Average
Exercisable Price
Options
 

 
$

 
308,727

 
$
19.69

Stock Appreciation Rights
 

 
$

 
46,572

 
$
14.06