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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2018
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.
 
Three Months Ended
 March 31, 2018
 
Shares
 
Weighted Avg.
Exercise Price
Outstanding, beginning of period
2,846,926

 
$
39.00

Granted
201,580

 
42.85

Exercised
(20,643
)
 
28.14

Forfeited
(3,409
)
 
31.98

Cancelled
(439,189
)
 
54.94

Outstanding, end of period
2,585,265

 
$
36.69

Vested and exercisable, end of period
1,241,595

 
$
40.90
Restricted Stock Units Activity
A summary of activity and weighted average fair values related to the RSUs is reflected in the table below.
 
Three Months Ended
 March 31, 2018
 
Shares
 
Weighted Avg.
Fair Value
Outstanding, beginning of period
1,104,792

 
$
32.62

Granted
431,775

 
41.92

Dividend equivalent units granted
7,257

 
40.70

Vested
(337,275
)
 
34.76

Dividend equivalent units vested
(16,553
)
 
35.99

Forfeited
(5,715
)
 
30.57

Dividend equivalent units forfeited
(205
)
 
37.39

Outstanding and nonvested, end of period
1,184,076

 
$
35.40
Unrestricted Stock Award Activity
A summary of activity and weighted average fair values related to the restricted stock awards is as follows:
 
Three Months Ended
 March 31, 2018
 
Shares
 
Weighted Avg.
Fair Value
Outstanding, beginning of period
41,718

 
$
36.84

Outstanding and nonvested, end of period
41,718

 
$
36.84
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.
 
Three Months Ended
 March 31, 2018
 
Shares
 
Weighted Avg.
Fair Value
Outstanding, beginning of period
252,815

 
$
22.53

Granted (1)
54,059

 
42.40

Dividend equivalent units granted
1,026

 
40.71

Vested
(36,920
)
 
38.67

Dividend equivalent units vested
(2,680
)
 
35.20

Forfeited
(139,628
)
 
13.25

Dividend equivalent units forfeited
(231
)
 
35.24

Outstanding and nonvested, end of period
128,441

 
$
36.58

 
(1)
Represents shares of PSUs for which performance targets have been established and which are deemed granted under U.S. GAAP.
Unrecognized Compensation Cost, Nonvested Awards
As of March 31, 2018, 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
$
51,045

 
2.7