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Share-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Options outstanding and exercisable under the Company's 1991 Equity and Performance Incentive Plan
Options outstanding and exercisable as of June 30, 2018 are included under the Company’s 1991 Equity and Performance Incentive Plan (as Amended and Restated as of February 12, 2014) (the 1991 Plan) and the Company's 2017 Equity and Performance Incentive Plan (the 2017 Plan). In conjunction with the appointment of the Chief Executive Officer on February 21, 2018, the board approved the grant of options, performance share units and RSUs outside of the the 2017 Plan. Changes during the six months ended June 30, 2018 were as follows:
 
 
Number of
Shares
 
Weighted-
Average
Exercise
Price
 
Weighted-
Average
Remaining
Contractual
Term
 
Aggregate
Intrinsic
Value (1)
 
 
 
 
(per share)
 
(in years)
 
 
Outstanding at January 1, 2018
 
2.3

 
$
29.68

 
 
 
 
Granted
 
0.5

 
$
17.54

 
 
 
 
Outstanding at June 30, 2018
 
2.8

 
$
27.28

 
7
 
$
—

Options exercisable at June 30, 2018
 
1.6

 
$
30.51

 
6
 
$
—

Options vested and expected to vest(2) at June 30, 2018
 
2.7

 
$
27.46

 
7
 
$
—

(1) 
The aggregate intrinsic value (the difference between the closing price of the Company’s common shares on the last trading day of the second quarter of 2018 and the exercise price, multiplied by the number of “in-the-money” options) that would have been received by the option holders had all option holders exercised their options on June 30, 2018. The amount of aggregate intrinsic value will change based on the fair market value of the Company’s common shares.
(2) 
The options expected to vest are the result of applying the pre-vesting forfeiture rate assumption to total outstanding non-vested options.
Summarized information on unvested restricted stock units (RSUs), performance shares and deferred shares
The following table summarizes information on non-vested RSUs and performance shares relating to employees and non-employee directors for the six months ended June 30, 2018:
 
 
Number of
Shares
 
Weighted-Average
Grant-Date Fair
Value
 
 
 
 
 
RSUs:
 
 
 
 
Non-vested at January 1, 2018
 
1.3

 
$
27.76

Forfeited
 
(0.1
)
 
$
22.38

Vested
 
(0.7
)
 
$
28.49

Granted
 
1.3

 
$
17.82

Non-vested at June 30, 2018
 
1.8

 
$
20.59

Performance Shares:
 
 
 
 
Non-vested at January 1, 2018
 
2.5

 
$
31.37

Forfeited
 
(0.6
)
 
$
29.68

Vested
 
(0.2
)
 
$
32.38

Granted
 
1.6

 
$
22.64

Non-vested at June 30, 2018
 
3.3

 
$
26.93