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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Non-Qualified Stock Options, Activity
A summary of activity and weighted average exercise prices related to the NSOs is reflected in the table below.
 
Nine Months Ended
 September 30, 2017
 
Shares
 
Weighted Avg.
Exercise Price
Outstanding, beginning of period
2,396,160

 
$
45.82

Granted
931,913

 
32.12

Exercised
(396,217
)
 
28.35

Forfeited
(426,406
)
 
29.16

Cancelled
(77,793
)
 
48.09

Adjustment due to the 2017 Special Cash Dividend
452,738

 
*

Outstanding, end of period
2,880,395

 
$
38.96

Vested and exercisable, end of period
1,197,862

 
$
48.45
Restricted Stock Units Activity
A summary of activity and weighted average fair values related to the RSUs is reflected in the table below.
 
Nine Months Ended
 September 30, 2017
 
Shares
 
Weighted Avg.
Fair Value
Outstanding, beginning of period
1,230,676

 
$
40.92

Granted
624,591

 
32.77

Dividend equivalent units granted
23,686

 
38.63

Vested
(558,603
)
 
38.28

Dividend equivalent units vested
(19,502
)
 
32.34

Forfeited
(337,235
)
 
32.06

Dividend equivalent units forfeited
(10,191
)
 
32.20

Adjustment due to the 2017 Special Cash Dividend
223,698

 
*

Outstanding and nonvested, end of period
1,177,120

 
$
32.75


 
*
Not meaningful
Unrestricted Stock Award Activity
A summary of activity and weighted average fair values related to the unrestricted stock awards is as follows:
 
Nine Months Ended
 September 30, 2017
 
Shares
 
Weighted Avg.
Fair Value
Outstanding, beginning of period
—

 
$
—

Granted
10,147

 
34.98

Vested
(10,147
)
 
34.98

Outstanding and nonvested, end of period
—

 
$
—
Performance-based Units Activity
A summary of activity and weighted average fair values related to the PSUs and Supplemental PSUs is reflected in the table below.
 
Nine Months Ended
 September 30, 2017
 
Shares
 
Weighted Avg.
Fair Value
Outstanding, beginning of period
347,000

 
$
27.23

Granted (1)
117,777

 
31.45

Dividend equivalent units granted
3,503

 
38.68

Vested
(165,113
)
 
32.67

Dividend equivalent units vested
(3,726
)
 
32.50

Forfeited
(46,836
)
 
33.73

Dividend equivalent units forfeited
(5,601
)
 
40.72

Adjustment due to the 2017 Special Cash Dividend (1)(2)
24,244

 
*

Outstanding and nonvested, end of period
271,248

 
$
22.20

 
*
Not meaningful
(1)
Represents shares of PSUs for which performance targets have been established and which are deemed granted under U.S. GAAP.
(2)
Excludes 19,725 PSUs which have not yet been deemed granted under U.S. GAAP.
Unrecognized Compensation Cost, Nonvested Awards
As of September 30, 2017, the Company had not yet recognized compensation cost on nonvested awards as follows (dollars in thousands):
 
Unrecognized Compensation Cost
 
Weighted Average Remaining Recognition Period
Nonvested awards
$
40,543

 
2.5