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Stock-BasedCompensation Plans (Tables)
9 Months Ended
Sep. 30, 2018
Summary of Stock Options Issued Pursuant to Stock Incentive Plans

A summary of stock options issued pursuant to the Company’s stock incentive plans is as follows:

 

     Number of
Shares
     Weighted-
Average
Exercise
Price
     Weighted-
Average
Remaining
Contractual
Term (Years)
     Aggregate Intrinsic
Value of In-the-

Money  Options
 

Outstanding as of December 31, 2017

     6,162,717      $ 16.83        

Granted

     170,455        23.36        

Exercised

     (1,262,994      14.57        

Forfeited

     (81,881      18.62        
  

 

 

    

 

 

       

Outstanding as of September 30, 2018

     4,988,297      $ 17.60        6.30      $ 52,585,398  
  

 

 

    

 

 

    

 

 

    

 

 

 

Exercisable as of September 30, 2018

     3,533,425      $ 16.84        5.64      $ 39,930,860  
  

 

 

    

 

 

    

 

 

    

 

 

 

Black-Scholes Option-Pricing Model [Member]  
Estimated Fair Value of Options Granted Pricing Model with Weighted-Average Assumptions

The fair value of options that do not vest based on the achievement of certain market conditions granted during the nine months ended September 30, 2018 and 2017 were estimated on the date of grant using the Black-Scholesoption-pricing model, a pricing model acceptable under U.S. GAAP, with the following weighted-average assumptions:

 

     Nine Months Ended     Nine Months Ended  
     September 30, 2018     September 30, 2017  

Expected life (years)

     5.6       5.6  

Interest rate

     2.7     1.9

Volatility

     26.4     29.4

Dividend yield

     —         —    
Total Shareholder Return [Member] | Monte Carlo Simulation [Member]  
Estimated Fair Value of Options Granted Pricing Model with Weighted-Average Assumptions

The grant date fair value of the TSRs was estimated using the following weighted-average assumptions:

 

     Nine Months Ended     Nine Months Ended  
     September 30, 2018     September 30, 2017  

Expected life (years)

     2.9       2.9  

Interest rate

     2.4     1.5

Volatility

     28.0     26.5

Dividend Yield

     —         —    
LTIP Performance Shares [Member]  
Summary of Nonvested Performance Share Awards and Changes During Period

A summary of nonvested long-term incentive program performance share awards (“LTIP performance shares”) outstanding as of September 30, 2018, and changes during the period are as follows:

 

Nonvested LTIP Performance Shares

   Number of
Shares at
Expected
Attainment
     Weighted-
Average
Grant Date
Fair Value
 

Nonvested as of December 31, 2017

     1,125,035      $ 18.94  

Forfeited

     (89,582      19.24  
  

 

 

    

 

 

 

Nonvested as of September 30, 2018

     1,035,453      $ 18.92  
  

 

 

    

 

 

 

 

TSR Plan [Member]  
Summary of Nonvested Performance Share Awards and Changes During Period

A summary of nonvested TSRs outstanding as of September 30, 2018, and changes during the period are as follows:

 

Nonvested Total Shareholder Return Awards

   Number of
Shares at
Expected
Attainment
     Weighted-
Average
Grant Date
Fair Value
 

Nonvested as of December 31, 2017

     143,649      $ 24.37  

Granted

     541,214        31.31  

Forfeited

     (33,970      29.90  
  

 

 

    

 

 

 

Nonvested as of September 30, 2018

     650,893      $ 29.85  
  

 

 

    

 

 

 
Restricted Share Awards (RSAs) [Member]  
Summary of Nonvested Restricted Share and Changes During Period

A summary of nonvested restricted share awards (“RSAs”) as of September 30, 2018, and changes during the period are as follows:

 

Nonvested Restricted Share Awards

   Number of
Restricted

Share Awards
     Weighted-Average Grant
Date Fair Value
 

Nonvested as of December 31, 2017

     503,237      $ 20.63  

Vested

     (231,473      21.20  

Forfeited

     (47,411      19.88  
  

 

 

    

 

 

 

Nonvested as of September 30, 2018

     224,353      $ 20.18  
  

 

 

    

 

 

 
Performance-Based Restricted Share Awards [Member]  
Summary of Nonvested Performance Share Awards and Changes During Period

A summary of nonvested Performance-Based Restricted Share Awards (“PBRSAs”) as of September 30, 2018, and changes during the period are as follows:

 

Nonvested Performance-Based Restricted Share Awards

   Number of
Performance-Based
Restricted

Share Awards
     Weighted-Average Grant
Date Fair Value
 

Nonvested as of December 31, 2017

     173,636      $ 24.41  

Vested

     (173,636      24.41  
  

 

 

    

 

 

 

Nonvested as of September 30, 2018

     —        $ —    
  

 

 

    

 

 

 
Restricted Share Units [Member]  
Summary of Nonvested Restricted Share and Changes During Period

A summary of nonvested RSUs as of September 30, 2018, and changes during the period are as follows:

 

Nonvested Restricted Share Units

   Number of
Restricted
Share Units
     Weighted-
Average Grant
Date Fair Value
 

Nonvested as of December 31, 2017

     —        $ —    

Granted

     714,123        23.81  

Vested

     (10,000      25.72  

Forfeited

     (38,739      23.36  
  

 

 

    

 

 

 

Nonvested as of September 30, 2018

     665,384      $ 23.81