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Share-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2019
Share-based Payment Arrangement [Abstract]  
Schedule of Restricted Stock Units Activity
The following table summarizes restricted stock unit grants under the 2017 Plan during the three and six months ended June 30, 2019 and 2018, respectively:
Three Months Ended June 30,
Grantee Type
# of
Restricted Stock
Units Granted
Vesting
Period
Grant Date
Fair Value
(in thousands)
2019
Employee group
35,042
1-3 years
$
1,163

2018
Employee group
58,625
1-4 years
$
1,004

Six Months Ended June 30,
Grantee Type
# of
Restricted Stock
Units Granted
Vesting
Period
Grant Date
Fair Value
(in thousands)
2019
Trustee group
12,285
1 year
$
375

2019
Employee group
490,546
1-3 years
$
16,332

2018
Trustee group
373,438
1-3 years
$
5,975

2018
Employee group
955,751
1-4 years
$
14,071

The following table provides a summary of restricted stock awards activity under the 2010 and 2017 Plans as of June 30, 2019:
Six Months Ended June 30, 2019
Restricted Stock
Number of Time-Based Restricted Stock Units
Aggregate Intrinsic Value (in millions)
Number of Performance-Based Restricted Stock Units
Aggregate Intrinsic Value (in millions)
Number of Market Performance-Based Restricted Stock Units
Aggregate Intrinsic Value (in millions)
Non-vested as of December 31, 2018
1,028,256

$
26.3

71,428

$
1.8

587,500

$
15.0

Granted
259,663

 
—

 
243,168

 
Vested (1)
(375,400
)
 
(14,286
)
 
—

 
Forfeited
(137,846
)
 
—

 
(41,031
)
 
Non-vested as of June 30, 2019
774,673

$
25.1

57,142

$
1.9

789,637

$
25.6

(1)
For certain vested restricted stock units, common shares shall not be issued until the first to occur of: (1) termination of service; (2) change in control; (3) death; or (4) disability, as defined in the 2010 Plan. Of these vested restricted stock units, 568,753 belong to a member of the Board of Trustees who has resigned and common shares shall not be issued until the first to occur: (1) change in control; or (2) April 13, 2022. Holders of these certain vested restricted stock units are entitled to receive dividends, but are not entitled to vote the shares until common shares are issued. The amount of vested restricted stock units was 627,890 as of June 30, 2019 and had a related aggregate intrinsic value of $20.4 million at $32.42 per unit.
Schedule of Performance Thresholds
In the event that the TSR upon completion of the market performance period is achieved at the “minimum,” “target” or “maximum” level as set forth below, the awards will become vested as to the market condition with respect to the percentage RSUs, as applicable, set forth below:
Performance Level Thresholds
TSR
Market Performance Percentage
Maximum
12%
150% of Target Award
Target
10%
100% of Target Award
Minimum
8%
50% of Target Award
In the event that the RMS Relative Market Performance during the Market Performance Period is achieved at the “threshold,” “target” or “high” level as set forth below, the awards will become vested as to the market condition with respect to the percentage of RSUs, as applicable, set forth below:
Performance Level Thresholds
RMS Relative
Market Performance
Market Performance
Vesting Percentage
High Level
above 75th percentile
200%
Target Level
55th percentile
100%
Threshold Level
33th percentile
50%
Below Threshold Level
below 30th percentile
0%
Schedule of Valuation Assumptions
Assumptions used in the valuations are summarized by grant date as follows:

Award Date
Expected Stock Price Volatility
Risk-Free Interest Rate
Dividend Yield
2/26/2018
30%
2.35%
4.70%
4/2/2018
30%
2.34%
4.04%
7/1/2018
30%
2.58%
3.41%
10/1/2018
25%
2.85%
3.01%
3/8/2019
22%
2.43%
2.70%
3/15/2019
22%
2.40%
2.62%
4/22/2019
22%
2.40%
2.62%
5/30/2019
22%
2.40%
2.62%
Schedule of Stock Option Activity
The following tables provide a summary of option activity for the six months ended June 30, 2019 and 2018, respectively:
Options
Shares
(In thousands)
Weighted-Average Exercise Price
Weighted-Average Remaining Contractual Terms (Years)
Outstanding as of December 31, 2018
2,355,787

$
9.81

5.4
Granted
—

—

 
Exercised
(1,092,789
)
9.81

 
Forfeited or expired
(179,000
)
9.81

 
Outstanding as of June 30, 2019
1,083,998

9.81

6.4
 
 
 
 
Exercisable as of June 30, 2019
332,000

$
9.81

4.4
Outstanding as of December 31, 2017
5,477,617

$
9.72

6.0
Granted
—

—

 
Exercised
(1,735,000
)
9.65

 
Forfeited or expired
(91,000
)
9.81

 
Outstanding as of June 30, 2018
3,651,617

9.76

5.5
 
 
 
 
Exercisable as of June 30, 2018
3,111,120

$
9.72

4.9