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Stock-Based Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of unvested restricted stock unit activity
The following table summarizes the Company’s unvested restricted stock unit activity for the year ended December 31, 2015:
 

Shares
(in thousands)
 
Weighted-
Average
Price
 
Aggregate
Intrinsic
Value *
(in thousands)
Unvested Restricted Stock Units (RSUs)
 
 
Outstanding at January 1, 2015
504

 
$
31.67

 
$
17,423

Awarded
351

 
31.80

 


Vested
(322
)
 
31.99

 


Forfeited
(6
)
 
31.55

 


Outstanding at December 31, 2015
527

 
$
31.56

 
$
17,994

Outstanding and expected to vest at December 31, 2015
515

 
$
31.56

 
$
17,584


*  The intrinsic value is calculated using the closing price per share of $34.15, as reported by the New York Stock Exchange on December 31, 2015.
Summary of stock option activity
The following table summarizes the Company’s stock option activity for the year ended December 31, 2015:
 

Shares
(in thousands)
 
Weighted-
Average
Exercise
Price
 
Weighted-
Average
Remaining
Contractual
Life
 
Aggregate
Intrinsic
Value*
(in thousands)
Non-Qualified Stock Options
 
 
 
Outstanding at January 1, 2015
855

 
$
29.48

 
3.1
 
$
4,381

Exercised
(330
)
 
$
29.37

 
 
 
 

Forfeited
(2
)
 
$
29.66

 
 
 
 
Outstanding and exercisable at December 31, 2015
523

 
$
29.55

 
2.1
 
$
2,406

 * The intrinsic value represents the amount by which the fair market value of the underlying common stock exceeds the exercise price of the option, using the closing price per share of $34.15, as reported by the New York Stock Exchange on December 31, 2015.