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Share-Based Compensation Plan (Tables)
 6 Months Ended
Jun. 30, 2020
Share-based Payment Arrangement [Abstract]  
Summary of Service Condition Restricted Share Activity
The following table provides a summary of service condition restricted share activity as of June 30, 2020:
SharesWeighted-Average
Grant Date
Fair Value
Unvested at December 31, 2019149,179  $33.37  
Granted332,920  $25.53  
Vested(72,824) $33.13  
Cancelled(217,083) $25.53  
Unvested at June 30, 2020192,192  $28.73  
Performance-Based Equity Awards Methodology and Assumptions The grant date fair value of the performance awards, with market conditions, were determined using a Monte Carlo simulation method with the following assumptions:
Performance Award Grant DatePercentage of Total AwardGrant Date Fair Value by Component ($ in millions)VolatilityInterest RateDividend Yield
December 13, 2013
Relative Total Shareholder Return50.00%$4.729.00%
0.34% - 2.25%
2.40%
Absolute Total Shareholder Return50.00%$2.929.00%
0.34% - 2.25%
2.40%
February 11, 2015
Relative Total Shareholder Return30.00%$0.922.00%1.02%2.50%
Absolute Total Shareholder Return40.00%$0.722.00%1.02%2.50%
EBITDA Comparison30.00%$0.722.00%1.02%2.50%
July 27, 2015
Relative Total Shareholder Return30.00%$—(1)22.00%0.68%2.50%
Absolute Total Shareholder Return40.00%$—(1)22.00%0.68%2.50%
EBITDA Comparison30.00%$—(1)22.00%0.68%2.50%
February 10, 2016
Relative Total Shareholder Return70.00%$1.625.00%0.71%3.00%
Absolute Total Shareholder Return15.00%$0.225.00%0.71%3.00%
EBITDA Comparison15.00%$0.425.00%0.71%3.00%
February 15, 2017
Relative and Absolute Total Shareholder Return
65.00% / 35.00%
$2.728.00%1.27%5.60%
February 14, 2018
Relative and Absolute Total Shareholder Return
65.00% / 35.00%
$3.528.00%2.37%4.70%
February 13, 2019
Relative and Absolute Total Shareholder Return
65.00% / 35.00%
$4.526.00%2.52%4.20%
February 12, 2020
Relative Total Shareholder Return100%$4.923.40%1.41%—%
(1)Amounts round to zero.