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Stock-Based Compensation (Tables)
6 Months Ended
Jun. 30, 2016
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.
 
Six Months Ended
 June 30, 2016
 
Shares
 
Weighted Avg.
 Exercise Price
Outstanding, beginning of period
1,374,456

 
$
60.62

Granted
1,241,354

 
29.22

Forfeited
(172,789
)
 
40.20

Cancelled
(20,648
)
 
61.32

Outstanding, end of period
2,422,373

 
$
45.98

Vested and exercisable, end of period
605,762

 
$
61.01

Restricted Stock Units Activity
A summary of activity and weighted average fair values related to the RSUs is reflected in the table below.
 
Six Months Ended
 June 30, 2016
 
Shares
 
Weighted Avg.
Fair Value
Outstanding, beginning of period
839,789

 
$
58.39

Granted
790,027

 
29.60

Dividend equivalent units granted
17,153

 
37.68

Vested
(295,625
)
 
58.64

Dividend equivalent units vested
(5,415
)
 
41.51

Forfeited
(79,282
)
 
43.46

Dividend equivalent units forfeited
(1,390
)
 
39.20

Outstanding and nonvested, end of period (1)
1,265,257

 
$
41.13

 

(1) Includes 19,954 RSUs which were granted to foreign employees and which the Company expects to settle in cash. The fair value of these RSUs at June 30, 2016 was not material. These RSUs generally vest over a four year period.

Unrestricted Stock Award Activity
A summary of activity and weighted average fair values related to the unrestricted stock awards is as follows:
 
Six Months Ended
 June 30, 2016
 
Shares
 
Weighted Avg.
Fair Value
Outstanding, beginning of period

 
$

Granted
16,898

 
33.73

Vested
(16,898
)
 
33.73

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.
 
Six Months Ended
 June 30, 2016
 
Shares
 
Weighted Avg.
Fair Value
Outstanding, beginning of period
106,964

 
$
65.50

Granted (1)
295,390

 
21.26

Dividend equivalent units granted
3,578

 
38.93

Vested
(55,720
)
 
65.06

Dividend equivalent units vested
(1,009
)
 
41.64

Forfeited
(8,096
)
 
49.85

Dividend equivalent units forfeited
(199
)
 
39.79

Outstanding and nonvested, end of period
340,908

 
$
27.57

 
(1) Represents shares of PSUs for which performance targets have been established and which are deemed granted under U.S. GAAP. Includes 214,416 Supplemental PSUs with an average fair value of $16.13 which was determined using a Monte Carlo simulation model, as further described above.
Unrecognized Compensation Cost, Nonvested Awards
As of June 30, 2016, 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
$
73,845

 
2.8